Hand cramps may be the cause of strenuous exercise, high-intensity exercise, or hand pressure, incorrect posture, high activity, excessive loss of water and salt, resulting in cramps, but also may be a greater chance of calcium deficiency, you can check the blood calcium level. If calcium deficiency can take calcium gluconate tablets, cod liver oil, eat calcium-rich foods, fish soup, lean meat, shrimp, kelp, pig liver, sheep liver and other foods, usually more sunshine, strengthen the nutrition, promote the absorption of calcium, pay attention to warmth, don’t overdo it.