Cramps generally refer to muscle spasms, the soles of the feet are always muscle spasms considered to be due to cold stimulation, excessive fatigue, calcium deficiency and other factors. 1. Cold stimulation: winter night room temperature is low, if you sleep, the feet exposed to the outside of the quilt, can be due to cold stimulation, resulting in the soles of the feet always muscle spasms. 2. Excessive fatigue: Walking too much or exercising for too long will cause excessive fatigue of the feet, leading to accumulation of lactic acid, resulting in spasms of the soles of the feet. 3. Calcium deficiency: Calcium deficiency will easily lead to muscle excitation, which will cause the spasm of the sole of the foot, and will be accompanied by lack of energy, weakness of the lower limbs and other phenomena. In addition, high fever, epilepsy, rabies, dehydration, etc. can also cause muscle spasms in the soles of the feet, if accompanied by other symptoms, you should immediately go to the hospital, and actively cooperate with the doctor for examination and treatment.