Knee to foot cold, may be due to the following reasons: 1, may be due to the lower limbs caused by cold. Because the knee to the front part of the calf, the surface of the soft tissue cover is relatively thin, if cold, very easy to cause the local blood circulation here becomes poor, long time will appear cold, pain. People often say old cold legs, is due to a similar lesion mechanism and lead to. 2, may be due to the lower limbs of the vascular lesions caused by. For this situation is more common, the popliteal fossa on the back side of the knee joint or the part that leans upward. Embolism or narrowing of some arteries in the lower limbs will lead to poor blood circulation in the area below the knee joint, which in time will lead to coldness and pain in the above area. 3, it may be due to prolonged braking, for example, if the patient sits for a long period of time and makes the lower limbs overly flexed, it may lead to poor blood circulation in the above area, which will lead to the symptoms of coldness. Symptoms of coldness. Patients traveling for a long time, such as when taking a train or airplane, there may be a similar situation.