Foot cramps may be caused by calcium deficiency, related internal diseases and cold external environment. 1. Calcium deficiency: such as postmenopausal women, the elderly, pregnant women, and teenagers, these groups of people have a higher demand for calcium and are prone to calcium deficiency, leading to frequent foot cramps. 2. Related medical diseases: polymyalgia, peripheral neuropathy, uremia, diabetes mellitus, thyroid disease, low magnesium, low calcium, hypokalemia, etc. may cause foot cramps. 3. Cold external environment: the cold will make the human body vasoconstriction, so that blood circulation is not smooth, vasoconstriction and further aggravate the loss of calcium, which in turn induced foot cramps, such as swimming in the water temperature is low; sleeping in an improper sleeping position leads to cold calves. It is important to note that if foot cramps occur frequently, you should go to the hospital in a timely manner to identify the cause of the disease and actively treat it, so as not to delay the condition.