A case report of primary hyperparathyroidism in an adolescent during Ramadan fast.

Primary hyperparathyroidism is rare in children and usually presents with nonspecific symptoms. Ramadan fasting has been reported to unmask the diagnosis of primary hyperparathyroidism. A 15-year-old boy presented to the clinic for an emergency department follow up visit. He had started Ramadan fasting a week before his presentation to the clinic. He reported unintentional weight loss, abdominal pain, constipation, frequent headaches, exercise intolerance, tiredness, and palpitations. Physical examination was unremarkable except that he looked tired. Investigations revealed elevated calcium and parathyroid hormone, hypophosphatemia, low vitamin D, and parathyroid adenoma. He underwent parathyroidectomy, leading to a decrease in parathyroid hormone levels. He did well postoperatively, and by his 11-month follow-up visit, his calcium was back to a normal level, he was energetic, and had gained weight. A high index of suspicion is required to diagnose primary hyperparathyroidism in young patients, especially young Ramadan-fasting patients, who mostly present with vague nonspecific symptoms.