Tingling in the calf may be caused by local factors of the calf, pyriformis syndrome, lumbar disc herniation, sciatica and so on. 1. Local factors of the calf: if there is a blood circulation disorder, trauma, fatigue, infection, cold stimulation, etc., it will lead to numbness of the calf. 2. Piriformis syndrome: If you are subjected to indirect violence, feel the attack of wind and cold or sudden external rotation of the hip joint, the piriformis muscle will be pulled, which will damage the piriformis muscle, thus causing numbness in the calf and accompanied by pain. 3. Herniated lumbar intervertebral disc: when the patient’s intervertebral disc has different degrees of degenerative changes, under the action of external forces, the intervertebral disc fibrous ring rupture, resulting in the adjacent spinal nerve root stimulation, resulting in numbness in the calf. 4. Sciatica: If the patient’s nerve root is compressed, it will be transmitted along the pathway of sciatic nerve, resulting in numbness in the calf, and accompanied by pain. It is recommended to go to the regular hospital in time, under the guidance of the doctor, with the examination, according to the results of the examination, targeted treatment.