Thyroid disorders include hyperthyroidism, hypothyroidism, thyroiditis, thyroid cysts, and thyroid adenomas. Symptoms of hyperthyroidism include fear of heat, excessive sweating, hyperphagia, weight loss, rapid heartbeat, sensitivity and suspicion, irritability, etc. Symptoms of hypothyroidism include fear of cold, weakness, unresponsiveness, indifference, slowed heartbeat, and non-sunken edema of the hands, feet and face. Symptoms of thyroiditis are enlargement of the thyroid gland with pain, which can manifest as hyperthyroidism or hypothyroidism due to increased or decreased levels of thyroid hormones. Most patients with thyroid cysts and adenomas have no obvious symptoms, but when they are significantly enlarged, a mass may be palpable in the neck.