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.
WHAT YOU NEED TO KNOW: A total thyroidectomy is surgery to remove your thyroid gland. Your thyroid gland makes hormones that regulate your metabolism, body temperature, heart rate, and the level of calcium in your blood. Your thyroid gland is shaped like a butterfly and found in the front lower part of your neck.