Sudden foot cramps, need to take the cause of treatment including strenuous activities, calcium deficiency and cold, can be rest, calcium supplements and keep warm. 1. Strenuous activities: patients are likely to suffer from foot cramps if they are too active during long-distance running, hiking and other activities. Need to let the patient lying down, reverse muscle tension, wrenching the foot, can relieve the cramps. And ask the patient to pay attention to warm up before the next exercise, do not overdo the exercise, so as to avoid the recurrence of cramps. 2. Calcium deficiency: generally seen in middle-aged and elderly people. Calcium deficiency can lead to leg cramps. Patients need to go to the hospital for bone density measurement, and according to the results of bone density to take regular anti-osteoporosis treatment. Instead of simply taking calcium tablets and vitamin D, you should also take anti-osteoporosis drugs, such as alendronate, which inhibits osteoclasts and can effectively relieve cramps. 3. Catching cold: Especially in summer sleep, if the window is open and the calf is not covered tightly, it is very likely to lead to cramps. In the summer sleep need to pay attention to the calves of the appropriate warmth, do not excessive cold, so as not to cause cramps recurring.