The two main types of thyroid disease are hypothyroidism and hyperthyroidism. Conditions which causes hypothyroidism include inflammation of thyroid gland, a hereditary autoimmune condition where the cells of the body attack and damage the thyroid, iodine deficiency and non-functioning thyroid. Hypothyroidism may also occur in some women after childbirth but it is usually a temporary condition.The conditions that cause hyperthyroidism isGraves’ disease,toxic autonomously functioning thyroid nodule,Thyroiditis and excessive iodine.