Sciatic nerve lesions often lead to numbness in the feet, mainly due to the area innervated by the sciatic nerve. The sciatic nerve is a motor and sensory nerve responsible for all skin sensation and muscle movement in the lower extremities bilaterally. When the sciatic nerve is injured, it causes abnormal muscle movement and skin sensation far from the injured segment. Therefore, when the sciatic nerve is injured, it is particularly likely to cause numbness in the feet, mainly because the sciatic nerve is responsible for the skin sensation of the feet. Therefore, once the sciatic nerve is damaged, such as sciatica, sciatic nerve blunt contusion, sciatic neuritis and other diseases will cause the symptoms of numbness in the feet.