The causes of hand and leg cramps include localized cold, hypocalcemia, cervical spondylosis and so on. 1. Localized cold: cold hands and legs or working or living in a cold environment for a long time will easily cause poor local blood circulation and innervation disorders, which will lead to muscle spasms and cramps in the hands and legs. 2. Hypocalcemia: lack of calcium will cause increased excitability of nerves and muscles, which may cause numbness or pins and needles sensation in the tips of fingers (toes), legs and feet, twitching of hands and feet, muscle spasm and other symptoms. 3. Cervical spondylosis: such as spinal stenosis, hyperplasia and other diseases, will compress the spinal cord nerves, which will cause the corresponding part of the innervation of the nerve to occur radiological symptoms, such as numbness of the hands, legs, feet or muscle spasms and other manifestations. In addition to the above reasons, heavy laborers may also suffer from overstretching of ligaments and other conditions that may cause the above symptoms. If the above symptoms do not improve, it is recommended to go to the hospital to identify the cause of the disease and carry out targeted treatment.