If you have pain in your arm during the injection, if the place of puncture is in your arm during the IV infusion, it is possible that there is blood leakage or drug leakage from the local puncture hole, so you must immediately remove the needle and choose another place to re-puncture the infusion. If you exclude blood and fluid from the needle, it is possible that the infusion of fluid is too fast or too concentrated, resulting in pain in the vein, and generally slow down the infusion rate to improve the symptoms. If there is pain in the punctured area of the arm after the injection, it is usually the pain caused by subcutaneous hematoma or subcutaneous ecchymosis or soft tissue injury after the puncture, which can be slowly improved by applying heat after the local blood is completely stopped.