Is an excess of parathyroid hormone in the bloodstream due to overactivity of one or more of the body's four parathyroid glands. These glands are about the size of a grain of rice and are located in your neck.
Symptoms:
Fragile bones that easily fracture (osteoporosis)
Kidney stones
Excessive urination
Abdominal pain
Tiring easily or weakness
Depression or forgetfulness
Bone and joint pain
Frequent complaints of illness with no apparent cause