In the case of enlargement due to inflammation, adolescence or pregnancy, the thyroid will return to normal after the underlying condition resolves. Hypothyroidism is a condition resulting from under-activity of the thyroid gland. Symptoms may include fatigue, weight gain, sensitivity to cold, hoarse voice, dry and swollen skin, dry and brittle hair, constipation and occasionally numbness and tingling of the hands and feet. The cause is unknown in most cases. Treatment consists of giving thyroid hormone and must be continued life-long.
Hyperthyroidism is a condition resulting from over-activity of the thyroid gland.
Symptoms include sweating, nervousness, fatigue, insomnia, sensitivity to heat, increased hunger, weight loss, diarrhea, shaky hands, and bulging eyes. Treatment may consist of beta-blockers to control symptoms while the problem is being worked up. Definitive treatment may be surgery or medication. Surgery may be done to remove an overactive nodule or part of the gland. Pharmacological treatment consists of radioactive iodine.