The thyroid is a small, butterfly-shaped gland located at the base of the neck, just below the Adam's apple. It plays a crucial role in regulating the body's metabolism by producing hormones that control the speed of many bodily functions, including how quickly you burn calories and how fast your heart beats. Causes include autoimmune disease (Hashimoto's thyroiditis), certain medications, radiation therapy, thyroid surgery, and iodine deficiency. Symptoms : Fatigue, weight gain, cold intolerance, constipation, dry skin, hair loss, muscle weakness, depression, and slowed heart rate.
