We report a case of 18 year old woman with pseudohypoparathyroidism type la presenting with low bone mineral density and primary hypothyroidism. The patient was diagnosed because of muscular cramps, accompanied by elevated parathormone (PTH) level and hypocalciuria, but normal serum calcium, phosphate and magnesium levels. She had features of Albright's osteodystrophy: short stature with normal bone age, shortening of IV and V metacarpal bones, and small cerebral calcifications shown by CT.