The most common cause of hand and foot cramps is calcium deficiency, first of all, go to the hospital for blood calcium testing, if the blood calcium is significantly lower, you can carry out active clinical calcium supplementation treatment, usually eat more high-calcium foods, such as high-calcium milk, soy, dairy products. You can also take calcium carbonate granules and vitamin D3 to actively supplement calcium, and usually get more sunlight to facilitate the conversion of 7-dehydrocholesterol in the skin into active vitamin D3, which facilitates the reabsorption of calcium ions from food. Because calcium ions can inhibit the excitability of the neuromuscular junction, when calcium deficiency increases neuromuscular excitability, so it usually causes twitching of the hands and feet, manifesting as spasmodic pain in the feet and calves, especially at night, when calf cramps and calf pain are more common.