\rThyroid symptoms depend on the type of thyroid disorder a person is suffering from. Based on the symptoms thyroid disorder is categorized into two groups: hypothyroidism and hyperthyroidism. Hypothyroidism occurs when the thyroid gland does not produce enough thyroid hormones required by the body. It symptoms include excess fatigue, lethargy, cold sensitivity, dry skin, excess weight gain, constipation, sexual dysfunction etc. In hyperthyroidism, the thyroid gland becomes overactive and produce more than the required hormone. Its symptoms include increased appetite, nervousness, inability to concentrate, difficulty sleeping, brittle hair, itching, hair loss, nausea and vomiting, weight loss etc.\r