According to the The National Institute of Diabetes and Digestive and Kidney Diseases, about 4.6 percent of the U.S. population ages 12 and older has hypothyroidism. That means almost every 5 people out of 100! What is hypothyroidism? Hypothyroidism is diagnosed when the thyroid makes an insufficient amount of thyroid hormones. When this happens it can be reflected in your symptoms and your blood work. Common Symptoms Fatigue Constipation Dry skin Dry hair Hair loss/thinning