Hypothyroidism is a condition where the thyroid gland, a small butterfly-shaped gland in the neck, does not produce enough thyroid hormones. Thyroid hormones play a crucial role in regulating metabolism and energy production in the body.

Symptoms of hypothyroidism can include fatigue, weight gain, sensitivity to cold, dry skin, hair loss, depression, constipation, and heavy periods. In severe cases, hypothyroidism can also cause a slow heart rate and an enlarged heart.

The most common cause of hypothyroidism is an autoimmune disorder called Hashimoto’s thyroiditis, but it can also be caused by other factors such as radiation therapy, certain medications, surgery, or congenital defects.