Legs are prone to cramps after getting cold, but not necessarily cramps. The main reason for leg cramps after getting cold is that after local stimulation by cold, blood vessels contract, muscles contract, local blood supply is insufficient, circulation is slow, metabolites cannot be discharged quickly, resulting in the accumulation of lactic acid and other harmful substances, which finally causes prolonged muscle cramps. Other causes of leg cramps include calcium deficiency, muscle damage, and lumbar disc herniation. The best way to prevent this is to avoid getting cold, keep warm, avoid strenuous exercise, and warm up well before exercising.