Primary hyperparathyroidism (PHPT) is a common endocrine disorder, with prevalence of one to seven cases per 1000 adults. It is believed to be the most common cause of hypercalcemia, predominantly affecting elderly populations and women two to three times as often as men. Here we report a case of 75 year old male who presented to Medicine OPD with complaints of constipation, abdominal pain and occasional irrelevant talks. Investigation showed hypercalcemia. PTH levels were markedly raised with borderline 1,25 DIHYDROXYVIT D. Patient was dialysed and managed conservatively. Later follow-up reports revealed microoadenoma and underwent surgery.