The incidence of thyroid cancer is on the rise, partly because more cases are discovered incidentally when a patient undergoes testing for something unrelated, says The incidence of thyroid cancer is on the rise, partly because more cases are discovered incidentally when a patient undergoes testing for something unrelated, says Roberto Izquierdo, MD Roberto Izquierdo, MD, medical director of the thyroid center and the thyroid cancer program at Upstate. He discusses treatment and the outlook for people with thyroid cancer. He also goes over symptoms of an overactive and an underactive thyroid, cautioning that symptoms vary among individuals and tend to develop gradually., medical director of the thyroid center and the thyroid cancer program at Upstate. He discusses treatment and the outlook for people with thyroid cancer. He also goes over symptoms of an overactive and an underactive thyroid, cautioning that symptoms vary among individuals and tend to develop gradually.