Calf belly down to the dorsum of the foot is afraid of cold numbness may be due to cold weather, ankle exposure and other physiological factors, but also may be the lumbar intervertebral disc herniation, fasciitis, degenerative knee osteoarthritis and other pathological factors. 1. Physiological factors: Cold weather, exposed ankles and other reasons, caused by the calf and ankle by the cold stimulation, can lead to the calf to the dorsum of the foot cold and numb feeling. It can be relieved by keeping warm and resting. 2. Lumbar disc herniation: patients with lumbar disc herniation can cause nerve root compression symptoms, resulting in a cold and numb feeling from the calf down to the instep. 3. Fasciitis: the body is subjected to cold, damp climate, as well as chronic strain, trauma, autoimmune factors can cause aseptic inflammation of the fascia, resulting in leg blood vessels are squeezed, blood circulation is not smooth, the lower limbs will appear cold and numb symptoms. 4. Degenerative knee osteoarthritis: degenerative knee joints can cause localized aseptic inflammation, which can also lead to symptoms of coldness and numbness in the lower legs. Calf belly down to the back of the foot afraid of cold numbness may also be due to other causes such as dermal neuritis, etc., it is recommended that patients seek medical treatment in a timely manner for standardized treatment.