Hip injection a week still hurts may be caused by local infection, local tissue damage, nerve damage and other reasons. 1. Local infection: if the wound at the injection site is infected by bacteria and other pathogens, it can cause local inflammatory reaction, if not treated in time, it may still hurt after a week. 2. Damage to local tissues: If the injection damages soft tissues or blood vessels, a local swelling can be formed, which may still hurt after a week. 3. Nerve damage: If the sciatic nerve branch is inadvertently damaged by the injection, it may also happen that it still hurts a week later. It is recommended that the people who still have pain in the buttock for a week should go to the hospital in time to clarify the cause and carry out standardized treatment under the guidance of the doctor.