Which nerve in body causes calf cramps and ankle cramps? im not having back pain. im taking daily magnesium and that seems to help my muscle cramps somewhat after taking it so not sure if its magnesium or a nerve problem

Not really one nerve: Leg cramps are common in people with and without medical disorders, which means having leg cramps is not specific enough to lead a person to a diagnosis. A person can get more leg cramps if there is: muscle fatigue, physical inactivity, liver/kidney/thyroid disorder, diabetes, dietary imbalance, osteoarthritis, Parkinson disease, pregnancy, spinal stenosis, nerve damage or abnormality, etc,...