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.
How is a thyroid goiter treated? Thyroid medicine is given to bring your thyroid hormone levels back to a normal range. Radioactive iodine is given to damage cells in your thyroid gland and decrease the size of your goiter. Surgery may be done to remove all or a part of your thyroid gland.