Glossary

What is Hashimoto's thyroiditis?

Hashimoto's thyroiditis is an autoimmune condition where your immune system mistakenly attacks your thyroid gland. Over time the damage means the thyroid can't make enough hormone, and it is the most common cause of an underactive thyroid.

Written by Poshan Labs. Sources are named on the page. Last updated 26 October 2026.

Hashimoto's in your reports

Look for anti-TPO antibodies on your thyroid report; most people with Hashimoto's have them. TSH, T4 and T3 show how well your thyroid is keeping up. Each lab prints its own range.

Hashimoto's thyroiditis: an autoimmune condition where your immune system mistakenly attacks your thyroid gland.

Why Hashimoto's matters

Hashimoto's is 4 to 10 times more common in women than in men and most often starts between 30 and 50.

Many people have no symptoms at first. Later come:

  • tiredness and weight gain
  • feeling cold
  • constipation
  • dry skin or hair
  • heavy or irregular periods
  • sometimes a painless swelling in the neck called a goitre

It runs in families and is more likely if you have other autoimmune conditions like coeliac disease, rheumatoid arthritis, lupus or type 1 diabetes.

What helps with Hashimoto's

Thyroid hormone medicine from your doctor is the usual treatment once your levels drop.

With food:

  • The key point is iodine: you need some, but large amounts from seaweed or iodine supplements can make Hashimoto's worse, so talk to your doctor before using any.
  • Researchers are still studying selenium and vitamin D, with no firm advice yet.
  • Build meals around whole foods, protein and vegetables.

Keep active and well rested.

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