Definition: Hypercalcinemia, also known as nephrocalcinosis, is a rare condition characterized by an overproduction of calcium in the kidneys. It occurs when the body is unable to remove excess calcium from the blood due to a malfunctioning kidney function or a genetic disorder that affects the kidneys. In this condition, the kidneys produce too much calcium, leading to excessive accumulation in the bloodstream and potentially causing a variety of symptoms including: - Weight loss - Fatigue - Muscle weakness -