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Hypercalcemia of malignancy may also occur due to tumor production of vitamin D or parathyroid hormone. These causes are rare and constitute about 1% of all causes of hypercalcemia of malignancy. [22] Hypercalcemia of malignancy usually portends a poor prognosis, and the medial survival is 25–52 days of its development. [22]
Like hypocalcemia, hypercalcemia can be non-severe and present with no symptoms, or it may be severe, with life-threatening symptoms. Hypercalcemia is most commonly caused by hyperparathyroidism and by malignancy, and less commonly by vitamin D intoxication, familial hypocalciuric hypercalcemia and by sarcoidosis. [ 2 ]
Familial hypocalciuric hypercalcemia (FHH) is an inherited condition that can cause hypercalcemia, a serum calcium level typically above 10.2 mg/dL; although uncommon. [1] It is also known as familial benign hypocalciuric hypercalcemia (FBHH) where there is usually a family history of hypercalcemia which is mild, a urine calcium to creatinine ratio <0.01, and urine calcium <200 mg/day ...
IH can predispose individuals to osteopenia or osteoporosis, [2] and affects the entire body. IH arises due to faulty calcium homeostasis , a closely monitored process, where slight deviations in calcium transport in the intestines, blood, and bone can lead to excessive calcium excretion, bone mineral density loss, or kidney stone formation.
Though this condition is usually asymptomatic, if symptoms are present they are usually related to the causative process, (e.g. hypercalcemia). [4] Some of the symptoms that can happen are blood in the urine, fever and chills, nausea and vomiting, severe pain in the belly area, flanks of the back, groin, or testicles.
Although any joint may be affected, the knees, wrists, and hips are most common. [4] CPPD crystals appear as shattered glass under the microscope. When released into the synovial fluid, it causes unbearable pain to the patient. Flares are sudden, severe and without warning. Diet does not appear to cause flares.
However, excessive ingestion of calcium of more than 10-15 g per day has been reported to cause calcium levels too high for renal calcitriol suppression to control, resulting in net calcium absorption that ultimately causes hypercalcemia. [3] [10] Hypercalcemia affects the kidneys in multiple ways that altogether contributes to hypovolemia.
The most common causes of hypercalcemia are certain types of cancer, hyperparathyroidism, hyperthyroidism, pheochromocytoma, excessive ingestion of vitamin D, sarcoidosis, and tuberculosis. [3] Hyperparathyroidism and malignancy are the predominant causes. [14] It can also be caused by muscle cell breakdown, prolonged immobilization ...