Many patients will find that it is easy to get leg cramps when it is cold, and there are several reasons for this: 1. It is caused by poor blood circulation in the lower limbs. When it is cold, the blood circulation of the lower limbs itself will decelerate, and at this time if the patient is sitting or standing for a long time, it will lead to further deterioration of the blood circulation of the lower limbs, resulting in spasms in the muscles of the lower limbs due to ischemia.2. It may be due to the shaking of the muscles of the lower limbs. In cold weather, the muscles of the whole body will continue to shake to provide the necessary body heat. At this time of the year the lower limbs are often inadequately clothed and cramps develop.3. Cramps may occur as a direct result of exposure to cold. When it is cold, the lower limbs may directly induce cramps in the adjacent muscles if they are wading in water or in contact with cooler objects.4. It may be due to insufficient clothing. When it is cold, people tend to subconsciously increase the clothing of the upper body, but ignore the lower body, especially the lower legs, may cause cramps due to cold here.