“The symptoms are flexion of the elbow, wrist and palm metacarpophalangeal joints, straightening of the finger joints, inward retraction of the thumb, “eagle’s claw hand” and flexion of the knee and hip joints, without impairment of consciousness. Nocturnal leg cramps are a form of painful spasm and no studies have been done to correlate with lower blood calcium levels.
Although studies have shown that calcium supplementation can relieve painful cramps, there is insufficient evidence-based evidence, so calcium supplementation may not relieve nocturnal leg cramps.”