what causes hashimoto's disease

Hashimoto’s disease is an autoimmune condition , which means the immune system mistakenly attacks the thyroid gland. The exact cause isn’t fully known, but it usually involves a mix of genetic risk and environmental triggers such as infections, excess iodine, certain medicines, radiation exposure, and major stress or hormonal changes.

What’s going on

In Hashimoto’s, the immune attack slowly damages the thyroid, which can lead to hypothyroidism over time. Family history is common, and researchers believe inherited susceptibility plus triggers in the environment work together to start the process.

Common risk factors

• Family history of thyroid or autoimmune disease.

• Being female. Hashimoto’s is much more common in women.

• Infections or viruses. Some sources note viruses such as hepatitis C as possible triggers.

• Excess iodine. Too much iodine can trigger disease in people already at risk.

• Radiation exposure or certain medicines. These can contribute in some cases.

Bottom line

The simplest answer is: Hashimoto’s disease happens when the immune system attacks the thyroid, usually because of a genetic tendency plus one or more triggers from the environment.

If you want, I can also explain early symptoms , how it’s diagnosed , or how it’s treated.