system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 33-year-old woman comes to the physician because of constipation, abdominal pain, and decreased appetite for the past 2 months. She started a new diet and has been exercising 2 hours daily for several months in order to lose weight. She has a history of hypertension and hypothyroidism. She does not smoke or drink alcohol. Current medications include hydrochlorothiazide, a multivitamin, and levothyroxine. She recently started taking over-the-counter supplements with each meal. Her temperature is 36.2°C (97.2°F), pulse is 92/min, and blood pressure is 102/78 mm Hg. Examination shows dry mucous membranes. Cardiopulmonary examination shows no abnormalities. Her abdomen is soft; bowel sounds are decreased. Serum studies show:
Calcium 12.8 mg/dL
Phosphorus 4.6 mg/dL
Bicarbonate 22 mEq/L
Albumin 4 g/dL
PTH 180 pg/mL
TSH 9 μU/mL
Free T4 5 μg/dL
Which of the following is the most likely underlying cause of this patient's symptoms?"
assistant
Vitamin D toxicity