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.
It does this by releasing more thyroid-stimulating hormone (or TSH), which signals your thyroid to make more thyroid hormone. Your thyroid gland then makes and releases the hormone directly into your bloodstream. Your pituitary gland then senses that there is just the right amount of thyroid hormone in your body.With your thyroid hormone levels now restored to a normal level, your pituitary slows its production of TSH back down to normal.our pituitary gland then senses that there is just the right amount of thyroid hormone in your body. With your thyroid hormone levels now restored to a normal level, your pituitary slows its production of TSH back down to normal.