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Hashimoto's disease
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Hashimoto's disease

Hashimoto's disease is an autoimmune disorder that causes chronic inflammation of the thyroid gland, often leading to an underactive thyroid (hypothyroidism).

Overview

Hashimoto's disease is a condition where the immune system attacks the thyroid, a butterfly-shaped gland in the neck that regulates critical functions like growth, body temperature, heart rate, and metabolism. Chronic inflammation damages the thyroid, reducing its ability to produce hormones.

Symptoms

Signs and symptoms often develop gradually over months or years:

  • Goiter: An enlargement of the thyroid that may cause neck swelling or interfere with breathing and swallowing.
  • Hypothyroidism symptoms: Fatigue, weight gain, thin/dry hair, slow heart rate, joint or muscle pain, and constipation.
  • Physical changes: Pale, puffy face and cold sensitivity.
  • Reproductive/Mental health: Heavy or irregular menstrual periods, difficulty conceiving, difficulty concentrating, and depression.

Causes & Risk Factors

Hashimoto's disease is an autoimmune disorder. Lymphocytes (immune cells) accumulate in the thyroid and produce antibodies that destroy thyroid cells. This leads to a shortage of thyroid hormones.

Genetic factors, particularly variations in the HLA complex, may increase risk. Environmental triggers may include changes in sex hormones, viral infections, certain medications, radiation exposure, or excess iodine consumption.

Associated Genes

  • FOXP3
  • HLA-DRB1
  • PTPN22
  • SLC26A4
  • TG
  • CTLA4

Inheritance

The inheritance pattern is unclear. The condition can cluster in families, and having a close relative with Hashimoto's or another autoimmune disorder increases an individual's risk.

Frequently Asked Questions

t diagnosis, clinicians usually order a TSH, free T4, and thyroid antibody panel (anti‑TPO and anti‑thyroglobulin). Once hypothyroidism is established, TSH is checked every 6–12 months to adjust levothyroxine dose. If you are still euthyroid, annual TSH monitoring is reasonable; a rising TSH may signal progression toward overt hypothyroidism.
Hashimoto’s often presents with a combination of fatigue, unexplained weight gain, cold intolerance, dry skin, and hair thinning. Blood tests showing low free T4 (or total T4) together with elevated thyroid‑stimulating hormone (TSH) and positive anti‑thyroid peroxidase (TPO) or anti‑thyroglobulin antibodies are the most reliable way to confirm that the symptoms are thyroid‑related rather than purely lifestyle‑driven.
While no diet cures the autoimmune process, many patients find benefit from a balanced diet low in processed foods and adequate in selenium (e.g., Brazil nuts) and iodine‑appropriate intake. Gluten‑free or dairy‑free trials may help if you have sensitivities, but they are not universally required. Regular exercise, stress reduction, and adequate sleep support overall metabolism and can lessen fatigue, but they do not replace thyroid hormone replacement when needed.
Pregnancy increases demand for thyroid hormone, so women with Hashimoto’s often need a higher levothyroxine dose (often 30‑50 % increase) early in pregnancy. Close monitoring of TSH every 4–6 weeks is essential; the goal is to keep TSH < 2.5 mIU/L in the first trimester. Untreated hypothyroidism raises risks of miscarriage, preterm birth, and neurodevelopmental issues in the baby, so coordinated care with an endocrinologist and obstetrician is crucial.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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