A goiter is an abnormal enlargement of thyroid gland. Thyroid is a butterfly-shaped gland located at the base of neck just below Adam's apple. Although goiters are usually painless, a large goiter can cause a cough and make it difficult to swallow or breathe. Symptoms of goiter are tightness in throat, coughing, hoarseness, difficulty swallowing, difficulty breathing. Causes of goiter are iodine deficiency, grave disease, hashimoto disease, multinodular goiter, pregnancy. Goiter treatment is done by endocrinologists.