Thyroiditis: A Comprehensive Guide to Symptoms, Causes, Diagnosis, and Treatment

Thyroiditis is a general term for inflammation of the thyroid gland — the small, butterfly-shaped gland at the front of your neck that regulates metabolism, energy, heart rate, and numerous other body functions. When this gland becomes inflamed, it can lead to a range of thyroid hormone abnormalities: too much, too little, or fluctuating levels over time.

Understanding thyroiditis is important because its symptoms often overlap with other conditions, making early and accurate diagnosis essential. According to the Cleveland Clinic, thyroiditis represents a group of conditions rather than a single disease, each with different causes, symptoms, and outcomes. This article covers thyroiditis symptoms, causes, diagnostic tools including labs and ultrasound, treatment strategies, and its relationship with related conditions such as goitre.

Thyroiditis Symptoms

The symptoms of thyroiditis depend on the type and the phase of the condition. Most forms of thyroiditis follow a triphasic pattern, meaning patients pass through three distinct stages that each produce different symptoms.

Phase 1: Thyrotoxic Phase (Hyperthyroid Symptoms)

In the early stage, the inflamed thyroid releases excess stored hormones into the bloodstream, causing symptoms of an overactive thyroid (thyrotoxicosis). This phase is typically short, lasting one to three months, and may include:

Rapid or irregular heartbeat (palpitations)
Unexplained weight loss despite normal or increased appetite
Anxiety, nervousness, and irritability
Tremors in the hands and fingers
Excessive sweating and heat intolerance
Trouble sleeping or insomnia
Frequent bowel movements or diarrhoea
Fatigue despite feeling “wired”

Phase 2: Hypothyroid Phase (Underactive Thyroid Symptoms)

Once the thyroid’s hormone stores are depleted, the gland enters an underactive phase. This stage may last several months and can become permanent in some types. Symptoms include:

Persistent fatigue and sluggishness
Unexplained weight gain
Depression and low mood
Dry skin and brittle hair or nails
Constipation
Increased sensitivity to cold
Muscle weakness and joint pain
Brain fog and difficulty concentrating
Puffy face, especially around the eyes

For a closer look at how hypothyroidism develops and what can be done about it, see our guide on how to cure thyroid.

Phase 3: Euthyroid Phase (Normal Thyroid Function)

Many patients eventually return to normal thyroid function, particularly those with subacute or postpartum thyroiditis. However, those with Hashimoto’s thyroiditis or radiation-induced thyroiditis often remain permanently hypothyroid and require ongoing treatment.

Thyroiditis Symptoms in Females

Women are significantly more likely to develop thyroiditis than men. Hashimoto’s thyroiditis, the most common form, occurs four to ten times more frequently in women, most often developing between ages 30 and 50. Several forms of thyroiditis are either exclusive to or more prevalent in females due to hormonal and immunological factors.

Hormonal Triggers and Female-Specific Risk

Oestrogen and progesterone fluctuations throughout a woman’s life — during puberty, pregnancy, and menopause — can influence immune system function and thyroid activity. This makes women more susceptible to autoimmune thyroid conditions. Women approaching or going through menopause may notice that thyroid symptoms become more pronounced or harder to distinguish from menopausal changes. Our article on menopause and underactive thyroid explores this overlap in detail.

Postpartum Thyroiditis in Women

Postpartum thyroiditis affects women within the first year after giving birth, miscarriage, or medical abortion. It is an autoimmune condition triggered when the maternal immune system rebounds after the immunosuppressed state of pregnancy. Symptoms typically follow the classic triphasic pattern:

Hyperthyroid symptoms (weeks 1–4 postpartum): palpitations, anxiety, weight loss
Hypothyroid symptoms (months 4–8 postpartum): fatigue, low mood, weight gain
Return to normal function in most cases by 12–18 months

Approximately 20% of women with postpartum thyroiditis go on to develop permanent hypothyroidism. Women with a personal or family history of autoimmune disease, or positive thyroid peroxidase (TPO) antibodies, are at higher risk. If you are pregnant or planning to conceive, understanding your thyroid health is critical — read our guide on how to control thyroid during pregnancy.

Thyroid-Related Hair Loss in Women

Hair loss is one of the most distressing symptoms women report with thyroiditis, particularly during the hypothyroid phase. Both hypothyroidism and hyperthyroidism can disrupt the hair growth cycle, leading to diffuse thinning. Learn more about the connection between thyroid disorders and hair loss in our dedicated article on thyroid disorder and hair loss.

Vitamin D Deficiency and Female Thyroid Health

Research increasingly links vitamin D deficiency to autoimmune thyroid conditions. Women with Hashimoto’s thyroiditis frequently have low vitamin D levels, and optimising vitamin D status may support immune regulation. Our article on vitamin D and low thyroid covers this relationship in depth.

Thyroiditis Symptoms and Treatment

Managing thyroiditis effectively requires matching treatment to the specific phase and type of the condition. As reviewed in the American Family Physician, most forms are self-limiting and do not require aggressive intervention throughout all phases.

Treating Hyperthyroid Symptoms

During the thyrotoxic phase, the goal is symptom control rather than suppressing thyroid hormone production, since the excess hormone is being released from damaged tissue rather than being overproduced. Standard approaches include:

Beta-blockers (e.g., propranolol, atenolol) to reduce palpitations, tremors, and anxiety
Anti-thyroid medications are generally NOT recommended during this phase, as they are ineffective against released hormone
Rest and monitoring, since the phase typically resolves within one to three months

Treating Hypothyroid Symptoms

If the hypothyroid phase causes significant symptoms or is expected to be permanent, thyroid hormone replacement therapy is used:

Levothyroxine (synthetic T4) is the standard medication, taken daily on an empty stomach
For Hashimoto’s thyroiditis: lifelong therapy is usually required
For subacute, silent, or postpartum thyroiditis: therapy may be tapered after 6–12 months to assess whether the gland has recovered

Treating Pain in Thyroiditis

Subacute thyroiditis and acute infectious thyroiditis can cause significant neck pain. Treatment options include:

NSAIDs (ibuprofen or aspirin) for mild to moderate pain
Corticosteroids (e.g., prednisone) for severe pain or when NSAIDs are insufficient
Antibiotics: required only in bacterial (suppurative/infectious) thyroiditis

For dietary support during thyroiditis management, our hypothyroidism diet plan provides practical, evidence-informed guidance.

Thyroiditis Causes

Thyroiditis arises from multiple different causes. Understanding the underlying trigger is essential for choosing the right treatment approach. As detailed by StatPearls/NCBI, the thyroid gland is naturally protected by its capsule, rich blood supply, and extensive lymphatic drainage, yet various agents can still initiate inflammation.

Autoimmune Disease (Most Common Cause)

The immune system mistakenly produces antibodies that attack the thyroid gland — particularly anti-thyroid peroxidase (TPO) antibodies — damaging thyroid cells. This mechanism underlies Hashimoto’s thyroiditis (the most common type), silent thyroiditis, and postpartum thyroiditis. Genetic factors, including HLA-DR3, HLA-DR4, and HLA-DR5 associations in Caucasian populations, contribute to autoimmune susceptibility.

Viral Infections

Subacute (de Quervain’s) thyroiditis is strongly associated with preceding upper respiratory tract infections. Viruses including coxsackievirus A and B, echovirus, influenza, adenovirus, and Epstein-Barr virus are implicated. The viral structure may resemble thyroid proteins, triggering an immune cross-reaction. There is also a strong genetic association with HLA-B35.

Bacterial and Other Infections

Acute suppurative (infectious) thyroiditis is rare but serious. It is most commonly caused by gram-positive bacteria such as Staphylococcus aureus and Streptococcus species, though mycobacteria and fungi can cause infections in immunocompromised individuals. The source of infection is usually haematogenous spread or congenital structural abnormalities such as a pyriform sinus fistula.

Medications and Drugs

Several medications are known to disrupt thyroid function and trigger thyroiditis:

Amiodarone: can cause both hypothyroidism and hyperthyroidism through its high iodine content and direct cytotoxic effects on thyroid cells
Lithium: reduces secretion of thyroid hormones, raising TSH and potentially causing goitre
Interferon-alfa: approximately 15% of patients on this therapy develop thyroid dysfunction
Interleukin-2: associated with thyroid autoimmunity
Immune checkpoint inhibitors (e.g., nivolumab, pembrolizumab, ipilimumab): increasingly used in cancer treatment, these carry a significant risk of destructive thyroiditis and hypothyroidism
Tyrosine kinase inhibitors (e.g., sunitinib, lenvatinib): associated with both hyper- and hypothyroidism

Radiation

External beam radiation to the neck and radioactive iodine therapy (used to treat hyperthyroidism or thyroid cancer) can both cause radiation-induced thyroiditis. This may produce temporary thyroid pain 7–10 days after treatment and carries a long-term risk of permanent hypothyroidism.

Fibrosis

Riedel thyroiditis is an exceptionally rare condition in which the thyroid undergoes progressive fibrosis. Its exact cause is unclear, but it is closely related to IgG4-related sclerosing disease. It can extend beyond the thyroid, causing fibrosis of adjacent structures and severe compressive symptoms.

Thyroiditis Labs

Laboratory testing is central to diagnosing thyroiditis, identifying the underlying cause, and monitoring thyroid function over time. A thoughtful combination of blood tests can reveal the type and the phase of thyroiditis.

Thyroid-Stimulating Hormone (TSH)

TSH is the first-line screening test for thyroid dysfunction. It is secreted by the pituitary gland and regulates thyroid hormone production:

Low TSH: indicates hyperthyroidism or the thyrotoxic phase of thyroiditis
High TSH: indicates hypothyroidism or the hypothyroid phase
Normal TSH: consistent with the euthyroid (recovered) phase

Free T4 and Free T3

Free thyroxine (fT4) and free triiodothyronine (fT3) give direct insight into circulating thyroid hormone levels. In the thyrotoxic phase, both are typically elevated. In the hypothyroid phase, both are low.

Thyroid Peroxidase Antibodies (TPO-Ab)

Elevated TPO antibodies are present in approximately 90% of patients with Hashimoto’s thyroiditis and are also found in postpartum and silent thyroiditis. They confirm an autoimmune aetiology and can be detectable years before overt thyroid dysfunction develops.

Thyroglobulin Antibodies (TgAb)

Present in 20–50% of Hashimoto’s thyroiditis cases. Used alongside TPO antibodies to strengthen the diagnosis of autoimmune thyroiditis.

Thyroid Receptor Stimulating Antibodies (TRAb / TSI)

These antibodies stimulate the thyroid to overproduce hormones and are characteristic of Graves’ disease. Testing for TRAb is essential for differentiating Graves’ disease from destructive thyroiditis.

Erythrocyte Sedimentation Rate (ESR)

The ESR is markedly elevated in subacute thyroiditis, often exceeding 50 mm/hr and sometimes exceeding 100 mm/hr. It is typically normal or only mildly elevated in autoimmune thyroiditis. ESR is a key tool for distinguishing painful thyroiditis from painless autoimmune forms.

C-Reactive Protein (CRP)

CRP is an acute-phase inflammatory marker that rises rapidly during infection or significant inflammation. It is particularly elevated in acute suppurative (bacterial) thyroiditis and complements ESR in assessing inflammatory severity.

Radioactive Iodine Uptake (RAIU)

The RAIU test classifies the type of thyrotoxicosis:

Low uptake: characteristic of destructive thyroiditis (Hashimoto’s, subacute, postpartum, drug-induced) — hormone is released from damaged tissue, not produced
High or normal uptake: characteristic of production thyrotoxicosis (Graves’ disease, toxic adenoma)

This distinction is clinically essential because anti-thyroid drugs are effective in production thyrotoxicosis but ineffective in destructive thyrotoxicosis.

Baseline TSH Monitoring for Drug-Induced Thyroiditis

Patients starting amiodarone, lithium, interferon-alfa, interleukin-2, or immune checkpoint inhibitors should have baseline TSH testing before commencing therapy, with regular monitoring throughout treatment.

Subacute Thyroiditis

Subacute thyroiditis, also called de Quervain’s thyroiditis or granulomatous thyroiditis, is one of the most clinically distinctive forms of thyroiditis. It is the most common cause of a painful thyroid gland and is predominantly caused by a viral trigger.

Who Gets Subacute Thyroiditis?

Subacute thyroiditis predominantly affects women between the ages of 30 and 50, though it can occur at any age. It is typically preceded by an upper respiratory tract infection, with a seasonal pattern peaking in summer and autumn. There is a strong genetic association with HLA-B35.

Symptoms of Subacute Thyroiditis

The clinical presentation is distinctive:

Significant anterior neck pain or tenderness — often radiating to the jaw, ear, or chest
Low-grade fever and general malaise
Hyperthyroid symptoms in the early phase: palpitations, weight loss, anxiety, tremors
Hypothyroid symptoms in the later phase: fatigue, weight gain, depression
Mildly enlarged, firm thyroid gland that is exquisitely tender on palpation
History of a preceding viral illness: sore throat, muscle aches, fatigue

Diagnosis of Subacute Thyroiditis

Laboratory findings in subacute thyroiditis are characteristic:

Markedly elevated ESR (often >50 mm/hr, sometimes >100 mm/hr)
Elevated CRP
Low or suppressed TSH with elevated fT4 and fT3 in the thyrotoxic phase
Low radioactive iodine uptake — a hallmark finding that distinguishes it from Graves’ disease
TPO antibodies are usually negative or only mildly elevated

On ultrasound, the gland typically appears heterogeneous with hypoechoic areas and reduced Doppler flow — another distinguishing feature from Graves’ disease.

Treatment of Subacute Thyroiditis

Subacute thyroiditis is a self-limiting condition that typically resolves completely within 2–5 months, though thyroid function recovery may take up to 12–18 months. Treatment is entirely symptom-focused:

Mild cases: NSAIDs (ibuprofen 600–800 mg three times daily, or aspirin) for pain relief
Severe pain or systemic symptoms: corticosteroids (prednisone 40 mg/day, tapered over 6–8 weeks) provide rapid and dramatic relief
Hyperthyroid phase: beta-blockers (propranolol) for palpitations and tremors
Hypothyroid phase: levothyroxine if symptoms are significant; most cases resolve without permanent treatment

Approximately 5% of patients with subacute thyroiditis develop permanent hypothyroidism. Relapse occurs in about 2% of cases.

Thyroiditis Ultrasound

Thyroid ultrasound is the most important and widely used imaging modality for evaluating thyroid gland structure and inflammation. It is non-invasive, widely available, and provides structural information that laboratory tests alone cannot offer.

Hashimoto’s Thyroiditis on Ultrasound

Heterogeneous (non-uniform) thyroid parenchyma — the most characteristic finding
Diffusely reduced echogenicity (the gland appears darker than normal on the scan)
Coarse echotexture with a fibrous, nodular pattern
Gland may be enlarged (goitre) in early stages or atrophic (shrunken) in advanced disease
Thyroid nodules may be present and require evaluation for malignancy
Increased vascularity on Doppler imaging during active inflammation

If thyroid nodules are detected on ultrasound, risk stratification is recommended. See our article on how to remove thyroid nodules without surgery for more.

Subacute Thyroiditis on Ultrasound

Focal or diffuse hypoechoic (dark) areas corresponding to regions of inflammation
The hypoechoic areas are typically poorly defined and correspond to tender areas on examination
Reduced Doppler flow — in contrast to Graves’ disease, which shows markedly increased flow
Sonoelastography may show increased stiffness in affected areas
The gland may be mildly enlarged

Graves’ Disease on Ultrasound (for Comparison)

Diffusely enlarged, homogeneous thyroid gland
Markedly increased Doppler vascularity — the so-called “thyroid inferno” pattern
This distinguishes Graves’ disease from destructive forms of thyroiditis

Postpartum and Silent Thyroiditis on Ultrasound

Heterogeneous parenchyma similar to Hashimoto’s thyroiditis
Reduced echogenicity
Reduced Doppler flow (unlike Graves’ disease)

Riedel Thyroiditis on Ultrasound

Ill-defined hypoechoic, fibrotic-appearing thyroid tissue
Loss of normal thyroid architecture
Possible calcification
Extension of abnormal tissue beyond the thyroid capsule into adjacent structures

Ultrasound-Guided Fine-Needle Aspiration (FNA)

Ultrasound is also used to guide fine-needle aspiration biopsies when suspicious nodules are detected. Any nodule greater than 10 mm with concerning sonographic features should be evaluated with FNA to exclude malignancy. Patients with Hashimoto’s thyroiditis carry a slightly elevated risk of thyroid lymphoma, making nodule surveillance particularly important.

Thyroiditis Radiology and USS

Beyond bedside ultrasound, several other radiological and nuclear medicine investigations contribute to the diagnosis and management of thyroiditis.

Radioactive Iodine Uptake (RAIU) Scan

The RAIU scan is critical for classifying thyrotoxicosis when the cause is unclear:

Low uptake (<5% at 24 hours): indicates destructive thyroiditis — hyperthyroidism is caused by release of stored hormone from damaged cells (Hashimoto’s, subacute, postpartum, drug-induced)
High or normal uptake: indicates production thyrotoxicosis — the gland is actively overproducing hormone (Graves’ disease, toxic adenoma)

This distinction is essential because anti-thyroid drugs are effective in Graves’ disease but not in destructive thyroiditis.

Thyroid Scan (Scintigraphy)

A technetium-99m or iodine-123 thyroid scan maps the functional activity of the gland:

Diffuse increased uptake throughout the gland: Graves’ disease
Hot nodule with suppressed surrounding tissue: toxic adenoma
Diffuse suppressed or absent uptake: destructive thyroiditis

CT and MRI in Thyroiditis

CT and MRI of the neck are not routinely required for thyroiditis but are used in specific scenarios:

Riedel thyroiditis: CT/MRI assesses the extent of fibrosis and involvement of the trachea, oesophagus, and surrounding structures
Acute suppurative thyroiditis: CT identifies abscess formation and can detect an underlying pyriform sinus fistula
Large goitres: CT determines whether the goitre extends retrosternally and whether it causes tracheal deviation or compression

Sonoelastography

A specialised ultrasound technique that measures tissue stiffness, sonoelastography can add diagnostic value in subacute thyroiditis by demonstrating increased stiffness in inflamed thyroid tissue. It is emerging as a complementary tool to conventional ultrasound.

Thyroiditis Treatment

Thyroiditis treatment varies widely depending on the type, phase, and severity of symptoms. In many cases, the condition is self-limiting and requires only careful monitoring and symptomatic management.

Hashimoto’s Thyroiditis Treatment

Overt hypothyroidism: levothyroxine replacement therapy, titrated to normalise TSH; lifelong therapy is usually required
Subclinical hypothyroidism (mildly elevated TSH, normal fT4, no symptoms): may be monitored without treatment, particularly if TPO antibodies are negative
Hashimoto’s with normal thyroid function: no medication needed; regular monitoring every 6–12 months
Anti-thyroid drugs have no role in Hashimoto’s, as it is not an overproduction disease

Subacute Thyroiditis Treatment

Mild pain: NSAIDs (ibuprofen 600–800 mg three times daily, aspirin)
Severe pain: prednisone 40 mg/day tapered over 6–8 weeks — provides rapid relief
Thyrotoxic phase: beta-blockers (propranolol 10–40 mg three to four times daily)
Hypothyroid phase: levothyroxine if symptomatic; usually temporary

Postpartum Thyroiditis Treatment

80% of cases resolve without permanent treatment by 12–18 months postpartum
Hyperthyroid phase: beta-blockers; anti-thyroid drugs are NOT effective
Hypothyroid phase: levothyroxine if symptomatic; may be weaned at 12 months to reassess thyroid function
Women with positive TPO antibodies should be monitored for recurrence in future pregnancies

Acute Infectious Thyroiditis Treatment

Antibiotics directed at the causative organism (gram-positive bacteria in most cases)
Abscess drainage by fine-needle aspiration or surgical intervention if an abscess forms
NSAIDs or corticosteroids for pain and inflammation

Drug-Induced Thyroiditis Treatment

Amiodarone-induced hypothyroidism: continue amiodarone if cardiology requires it; add levothyroxine replacement
Amiodarone-induced hyperthyroidism (Type 1): methimazole plus potassium perchlorate; Type 2: glucocorticoids
Lithium-induced hypothyroidism: continue lithium; add levothyroxine
Checkpoint inhibitor thyroiditis: close monitoring; corticosteroids for severe cases; endocrinology referral recommended

Riedel Thyroiditis Treatment

Surgical intervention is the primary treatment — debulking to relieve tracheal or oesophageal compression
Tamoxifen may slow fibrotic progression
Glucocorticoids combined with immunosuppressants for IgG4-related disease

Radiation-Induced Thyroiditis Treatment

Symptomatic management with NSAIDs
Prednisone for severe cases
Long-term monitoring for hypothyroidism, which is common after radioactive iodine therapy

Vitamin D plays a role in thyroid autoimmunity and overall thyroid health. Our article on vitamin D and hyperthyroidism covers relevant considerations for patients managing thyroid conditions.

Thyroiditis and Goitre

A goitre is an abnormal enlargement of the thyroid gland, and it is a common finding in several forms of thyroiditis. The Cleveland Clinic notes that some people with thyroiditis present with an enlarged thyroid gland as one of their primary signs.

Which Types of Thyroiditis Cause Goitre?

Hashimoto’s thyroiditis: causes a diffuse, painless goitre in its early or active phase; the gland may become atrophic in later stages
Graves’ disease: produces a smooth, diffuse goitre with increased vascularity
Subacute thyroiditis: may cause a tender, mildly enlarged thyroid resembling a goitre during the inflammatory phase
Riedel thyroiditis: produces a hard, fixed, painless goitre due to fibrosis — often mistaken for thyroid carcinoma on clinical examination
Lithium-induced thyroiditis: lithium causes goitre formation through reduced thyroid hormone secretion and elevated TSH stimulation over time

Goitre Symptoms

Most goitres are painless, but as the thyroid enlarges it can cause:

Visible swelling at the base of the neck
A sensation of tightness, choking, or difficulty swallowing (dysphagia)
Hoarseness or changes in voice quality
Difficulty breathing, particularly when lying flat
A feeling of pressure in the neck

Evaluating a Goitre

Any goitre discovered in the context of thyroiditis requires:

Ultrasound to assess gland size, texture, nodularity, and blood flow
Thyroid function tests (TSH, fT4, fT3)
TPO and TgAb antibodies to evaluate for autoimmune cause
Fine-needle aspiration if nodules are present and meet size or risk criteria
CT or MRI if the goitre extends retrosternally or causes compressive symptoms

Treatment of Goitre in Thyroiditis

Treatment of the underlying thyroiditis usually addresses the goitre itself. If hypothyroidism is driving the enlargement — as in Hashimoto’s or lithium-induced thyroiditis — levothyroxine reduces TSH stimulation and may shrink the gland over time. Surgical intervention (thyroidectomy) is reserved for large goitres causing significant compressive symptoms, goitres with suspicious nodules requiring histological assessment, or Riedel thyroiditis requiring decompression.

Frequently Asked Questions About Thyroiditis

What is the main cause of thyroiditis?

The most common cause is autoimmune disease, where the immune system mistakenly produces antibodies that attack the thyroid gland. This underlies Hashimoto’s thyroiditis, postpartum thyroiditis, and silent thyroiditis. Other causes include viral infections (subacute thyroiditis), bacterial infections (acute suppurative thyroiditis), certain medications, radiation therapy, and fibrosis (Riedel thyroiditis). A detailed overview is available from StatPearls/NCBI.

What to do for thyroid problems?

See your doctor for blood tests including TSH, fT4, and thyroid antibodies. Depending on the diagnosis, your doctor may recommend monitoring, thyroid hormone replacement (levothyroxine), anti-inflammatory medications, or further investigation with ultrasound. Maintaining a balanced diet, managing stress, and ensuring adequate vitamin D levels also support thyroid health. Our guide on how to cure thyroid outlines practical steps.

What happens if you have thyroiditis?

Most forms follow a triphasic pattern: an overactive phase (palpitations, weight loss, anxiety), followed by an underactive phase (fatigue, weight gain, depression), and often a recovery phase. Some types, particularly Hashimoto’s thyroiditis, lead to permanent hypothyroidism requiring lifelong treatment. If untreated, severe hypothyroidism can progress to myxedema coma and severe untreated hyperthyroidism can lead to thyroid storm — both medical emergencies.

Does thyroiditis go away on its own?

Many forms are self-limiting. Subacute thyroiditis typically resolves within 2–5 months. Postpartum and silent thyroiditis also tend to resolve within 12–18 months in approximately 80% of cases. However, Hashimoto’s thyroiditis and radiation-induced thyroiditis usually cause permanent hypothyroidism requiring ongoing treatment. Even self-limiting forms warrant monitoring to ensure full recovery and to detect any development of permanent hypothyroidism.

What antibiotics are used to treat thyroiditis?

Antibiotics are only used in acute infectious (bacterial/suppurative) thyroiditis, which is rare. The choice depends on the causative organism — usually gram-positive bacteria such as Staphylococcus aureus or Streptococcus species. Common regimens include penicillin-based antibiotics or clindamycin, with intravenous broad-spectrum antibiotics in hospitalised patients until cultures return. Antibiotics are not used in autoimmune, subacute (viral), or drug-induced thyroiditis.

What foods should you avoid with thyroiditis?

For autoimmune thyroiditis (Hashimoto’s), some evidence suggests limiting or avoiding gluten (particularly in those with concurrent coeliac disease), excessive raw cruciferous vegetables (broccoli, cabbage, kale — cooking reduces their anti-thyroid effect), large quantities of soy products, and highly processed and inflammatory foods. Foods that support thyroid health include selenium-rich foods (Brazil nuts, tuna), zinc (lean meats, shellfish), and anti-inflammatory foods (olive oil, berries, fatty fish). For a comprehensive nutrition guide, see our hypothyroidism diet plan.

At what age can thyroid problems start?

Thyroid problems can develop at any age. Hashimoto’s thyroiditis most commonly develops between ages 30 and 50. Graves’ disease often presents in younger adults aged 20–40. Postpartum thyroiditis occurs in the childbearing years. Women experiencing thyroid symptoms around midlife should also read our article on menopause and underactive thyroid, as the symptoms of the two conditions frequently overlap.

Are eggs bad for thyroiditis?

No — eggs are generally considered beneficial or neutral for people with thyroiditis. Eggs are a good source of iodine, selenium, and protein, all of which support thyroid health. The yolk contains iodine (important for thyroid hormone synthesis) and selenium (which protects thyroid cells from oxidative damage). There is no credible evidence that eggs worsen thyroiditis.

What not to do with thyroiditis?

Do not stop prescribed thyroid medication without consulting your doctor
Avoid excessive iodine supplementation, which can worsen autoimmune thyroiditis
Do not ignore new or worsening symptoms such as increasing neck swelling, difficulty swallowing, or voice changes
Avoid intense unsupervised exercise during the acute thyrotoxic phase
Do not take levothyroxine with calcium, iron supplements, or antacids within four hours, as these reduce absorption
Avoid smoking — it worsens thyroid autoimmunity and is associated with worse outcomes in Graves’ disease

What should I do if I have thyroiditis?

Follow your healthcare provider’s recommended treatment plan and attend all follow-up appointments. Have regular thyroid function tests (TSH, fT4) to monitor your thyroid status. Take thyroid medications as prescribed — levothyroxine is best absorbed on an empty stomach, 30–60 minutes before food. Manage stress, ensure adequate vitamin D levels, and report any new or worsening symptoms promptly. Our guide on vitamin D and low thyroid covers how to optimise this important nutrient.

What are 10 warning signs of thyroid problems?

The following symptoms may indicate a thyroid disorder and warrant medical evaluation:

Unexplained and persistent fatigue
Unexplained weight gain or weight loss
Persistent neck swelling or visible goitre
Rapid, irregular, or pounding heartbeat
Hair loss or diffuse thinning — see our article on thyroid disorder and hair loss
Intolerance to cold or heat
Significant mood changes — anxiety, depression, or irritability
Constipation or diarrhoea
Dry, rough skin or unusual sweating
Difficulty concentrating, brain fog, or memory lapses

How to calm down thyroiditis?

During a flare — particularly subacute thyroiditis — the following strategies can help manage symptoms: take prescribed NSAIDs or corticosteroids as directed; rest and avoid overexertion during the hyperthyroid phase; use beta-blockers as prescribed to control palpitations; apply a cool compress to the neck to ease pain; reduce stress through meditation or gentle breathing exercises; maintain a nutrient-dense anti-inflammatory diet; and avoid stimulants such as caffeine and alcohol during the thyrotoxic phase.

What is the best treatment for thyroiditis?

There is no single best treatment — the optimal approach depends on the type and phase. For pain in subacute thyroiditis: NSAIDs or corticosteroids. For hyperthyroid symptoms: beta-blockers. For hypothyroidism: levothyroxine. For Hashimoto’s with normal function: watchful waiting with monitoring. The American Family Physician recommends that in all cases of thyroiditis, surveillance and clinical follow-up are essential to monitor for changes in thyroid function.

What infections cause thyroiditis?

Viral infections are the most common trigger. Viruses associated with subacute thyroiditis include coxsackievirus A and B, echovirus, mumps, influenza, adenovirus, and Epstein-Barr virus. Bacterial infections causing acute suppurative thyroiditis include Staphylococcus aureus, Streptococcus pyogenes, and Streptococcus pneumoniae. In immunocompromised patients, mycobacteria, fungi (Aspergillus, Candida, Cryptococcus), and Pneumocystis jirovecii can also infect the thyroid.

How to avoid thyroiditis?

Not all forms are preventable, but these measures may reduce risk: maintain adequate vitamin D levels, as deficiency is linked to autoimmune thyroid conditions (see our guide on vitamin D and low thyroid); avoid excess iodine supplementation; if taking medications that carry thyroid risk, request regular TSH monitoring; treat upper respiratory tract infections promptly; if you have a family history of autoimmune thyroid disease, request annual thyroid screening; and do not smoke, as smoking is associated with higher risk of thyroid autoimmunity and Graves’ disease.

References

Cleveland Clinic. Thyroiditis. https://my.clevelandclinic.org/health/diseases/15455-thyroiditis
Martinez Quintero B, Yazbeck C, Sweeney LB. Thyroiditis: Evaluation and Treatment. American Family Physician. 2021;104(6):609–617. https://www.aafp.org/afp/2021/1200/p609
Fariduddin M, Singh G. Thyroiditis. StatPearls. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK555975/