Cold calves and cold knees may be symptoms caused by environmental factors, arterial occlusive disease and poor vascular circulation in the lower limbs. 1. Environmental factors: mainly caused by the cold environment, such as living and working in a cold environment for a long time, resulting in cold knees and calves. In this case, you should get out of the cold environment as soon as possible and keep warm. 2. Arterial Occlusive Disease: Due to the narrowing of the arterial lumen, part of the blood circulation in the legs and knees is affected to a certain extent, resulting in insufficient blood supply to the legs and knees and low skin temperature, so the symptoms of cold calves and cold knees will appear. 3. Poor vascular circulation function of the lower limbs: It may be that the vascular circulation function of the lower limbs is relatively poor, such as circulatory disorders, which will reduce the amount of circulating blood in the tissues around the knee joint, resulting in cold knees. This is mainly caused by ischemia of the arteries of the lower limbs, such as thrombosis or occlusion of the lower limb arteries, resulting in insufficient blood supply and hence the symptoms of cold knees and legs. Cold calves and cold knees should be kept warm in normal times, and if there are symptoms of coldness for a long time, you need to go to the hospital for examination in time.