The main reasons for thyroid problems are as follows:

Causes of thyroid problems
Autoimmune diseases:

Hashimoto’s thyroiditis: The body’s immune system mistakenly attacks the thyroid gland and slows down its function (Hypothyroidism).

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Graves’ disease: The immune system causes the thyroid gland to overwork (Hyperthyroidism).

Iodine deficiency: When the amount of iodine in the body decreases, the thyroid gland cannot produce hormones and the gland swells (Goiter).

Genetic factors: If your parents or close relatives have thyroid problems in your family, you are more likely to have them.

Hormonal changes: Thyroid problems are common in women due to hormonal changes during pregnancy, postpartum, and menopause.

Side effects of medications: Some medications (for example, medications for certain types of mental illness) can affect the function of the thyroid gland.

Other diseases or tumors: Nodules or infections in the thyroid gland can affect the function of the gland.