There are many causes of calf cramps, including daily life factors, disease factors and drug factors, such as excessive fatigue, cold stimulation, sedentary, excessive water loss in the body, calcium deficiency, lumbar disc herniation, arteriosclerosis of the lower limbs and adverse reactions to some drugs. Therefore, when calf cramps occur, you should go to the hospital for electrolyte measurement, lumbar CT and ultrasound of the lower limbs, and follow medical advice for symptomatic treatment.