A known patient with renal stone disease developed pathological fractures along with abdominal pain and ceain psychiatric symptoms. He should be investigated for

Hyperparathyroidism causessmooth-muscle atony, with upper and lower gastrointestinal symptoms such as nausea, heaburn and constipation. ... The digestive manifestations of parathyroid malfunction are often overlooked and serum calcium level must be included in the routine workup forabdominal symptoms. Ref ganong's review of medical physiology 25e