Physical symptoms that arise due to hypothyroidism usually include weight gain, dry hair, constipation, overwhelming fatigue and dry skin. Learn about hypothyroidism as a result of a thyroid that has stopped functioning with help from a physician in this free video on hypothyroidism. Expert: David Cathcart Bio: Dr. David Cathcart has been a physician at Heartland Regional Medical Center in St. Joseph, Mo. for over 20 years. He operates the occupational medicine clinic. Filmmaker: Johnny Cathcart…Twitter This!