Hung up reflex is seen

Hung-up reflex is defined as a deep tendon reflex in which, after a stimulus is given and the reflex action takes place, the limb slowly returns to its neutral position. This prolonged relaxation phase is characteristic of reflexes in persons with hypothyroidism.Myxedema a condition resulting from advanced hypothyroidism, or deficiency of thyroxine; it is the adult form of the disease whose congenital form is known as cretinism.Hypehyroidism is defined as the overproduction of thyroid hormones by an overactive thyroid.Hypothyroidism, or underactive thyroid, develops when the thyroid gland fails to produce or secrete as much thyroxine(T4) as the body needs.Pheochromocytoma is a tumor of special cells (called chromaffin cells), most often found in the middle of the adrenal gland.Ref: Ganong&;s review of medical physiology; 24th edition; page no-346