Leg numbness after a spanking injection may be related to drug irritation and damage to the nerves. Some of the drugs are more irritating to the muscles, and there may be transient localized pain, numbness, soreness, etc. after the injection. After a few days after the drug is completely absorbed, the pain and numbness symptoms will be able to disappear. If the numbness of the legs after injection is more serious, it may be related to the inappropriate selection of the injection site, the needle piercing the sciatic nerve. Generally, the numbness lasts longer and is often accompanied by leg weakness. It can be improved by neurotrophic drugs, such as methylcobalamin and adenosylcobalamin. If the symptoms of leg numbness appear after spanking injection, it is recommended to go to the hospital to improve the examination and receive regular treatment.