Graves' disease. Graves' disease is the most common cause of overactive thyroid. It can run in families and can occur at any age, although it is most common in women aged 20-40 years old. You are more likely to develop Graves' disease if you smoke. Graves' disease is an autoimmune condition.
Full Removal. If your doctor removes your entire thyroid, your body will begin to exhibit symptoms similar to hypothyroidism, due to the lack of thyroid hormones in your body. These symptoms may include fatigue, elevated cholesterol levels, uncontrollable weight gain, muscle weakness and depression.
Its job is to make thyroid hormone. If the gland is underactive, it may not make enough thyroid hormone. Thyroid hormones control how your body uses energy. They affect almost every organ in your body. When your thyroid doesnât make enough of these hormones, parts of your body slow down.