Foot cramps may be caused by environmental factors, excessive exercise, poor posture, calcium deficiency and other factors. 1. Environmental factors: not paying attention to the lower limbs in the cold weather to keep warm, resulting in cold feet, by the cold stimulation, may make the local muscle spasmodic contraction, will cause cramps. 2. Excessive exercise: Exercise for too long may lead to muscle fatigue, so that the metabolites in the muscle increase, it is easy to cause cramps. 3. Bad posture: Keeping a posture for a long time, such as lying on the back or prone for a long time, may make the muscles of the feet in an absolute state of relaxation, and the blood circulation will become poor, which is easy to cause foot cramps. 4. Calcium deficiency: a long time of unbalanced diet may lead to a lack of calcium in the body, so that the blood calcium level is lowered, then foot cramps will occur, and the frequency of cramps will be higher. The symptoms of foot cramps recurring, it is recommended to consult a doctor for examination, to clarify the specific causes and then timely treatment.