what causes muscle cramps in calves of legs?
 1 Poor blood circulation in the legs. 2 Overexertion of the calf muscles while exercising. 3 Insufficient stretching before exercise. 4 Exercising in the heat. 5 Muscle fatigue. 6 Dehydration. 7 Magnesium and/or potassium deficiency. 8 Calcium deficiency in pregnant women. 