Secondary hyperparathyroidism is commonly associated with which condition?

Secondary hyperparathyroidism is commonly associated with which condition?

• A. Liver disease
• B. Renal disease
• C. Vitamin C deficiency
• D. Thyroid disease

Answer: (B)

Secondary hyperparathyroidism happens when the parathyroid glands keep producing more PTH in response to low calcium levels caused by another condition. The classic culprit is chronic kidney disease. In CKD, the kidneys can’t excrete phosphate well, so phosphate builds up and binds calcium, lowering serum calcium. At the same time, damaged kidneys can’t form enough calcitriol (the active vitamin D), which reduces calcium absorption from the gut. This combination drives the parathyroid glands to secrete more PTH to raise calcium, leading to secondary hyperparathyroidism. Over time, the glands may enlarge and keep secreting PTH even if calcium normalizes, a situation that can progress to tertiary hyperparathyroidism. The other options don’t typically cause this pattern: liver disease, vitamin C deficiency, or thyroid disease aren’t the usual drivers of chronic, compensatory PTH elevation.

Secondary hyperparathyroidism happens when the parathyroid glands keep producing more PTH in response to low calcium levels caused by another condition. The classic culprit is chronic kidney disease. In CKD, the kidneys can’t excrete phosphate well, so phosphate builds up and binds calcium, lowering serum calcium. At the same time, damaged kidneys can’t form enough calcitriol (the active vitamin D), which reduces calcium absorption from the gut. This combination drives the parathyroid glands to secrete more PTH to raise calcium, leading to secondary hyperparathyroidism. Over time, the glands may enlarge and keep secreting PTH even if calcium normalizes, a situation that can progress to tertiary hyperparathyroidism. The other options don’t typically cause this pattern: liver disease, vitamin C deficiency, or thyroid disease aren’t the usual drivers of chronic, compensatory PTH elevation.