The gland itself might have some sort of disorder and then this disorder must be the one treated. Hormones will help you balance the sidorder and then have it fixed. The disorder can be controlled making the gland work normally. However having it 100% fixed without the use of medication/hormones is quite rare. The important tthing here is to restore the thyroid function, but this is not like catching a cold, you will need treatment for life in most cases.