Squatting for a long time leads to numbness in the legs, there are two reasons: the first is the compression injury of the sciatic nerve, the reason is the injury of the sciatic nerve, is due to the squatting position when the sciatic nerve in the popliteal fossa will be obviously compressed, a long time will lead to a mild compression injury of the sciatic nerve, belongs to the blunt contusion, this injury is very slight, so a few minutes to recover. The second is the local blood circulation disorder, squatting for a long time after the local blood circulation will lead to abnormal, arterial blood supply significantly reduced, or even lost, and venous return flow and obvious obstacles, so it will lead to squatting for a long time leg numbness.