A closed injection is generally not harmful, but some patients may experience swelling, red heat and other adverse reactions. Closed injection is mainly used for muscle injury, osteoarthrosis and other patients of closed treatment, joint tuberculosis, septic joints and other patients prohibited closed injection. Patients playing a closed injection generally does not cause harm to the body, but a small number of patients in the short term after the injection of closed injection will appear injection site swelling, red heat, pain and other adverse reactions, normal to the body does not have much effect, the patient’s discomfort after a period of time will disappear on their own. Closed injection is mainly used for muscle, ligament acute and chronic injury or degenerative muscle injury and other diseases, as well as humeral epicondylitis, traumatic arthritis and other osteoarthritis pain treatment. However, patients suffering from joint tuberculosis, septic arthritis, osteomyelitis and other diseases, as well as patients with serious cardiovascular disease are prohibited from using closed needle to prevent aggravation of the condition. A closed injection is not harmful to the body, and it is recommended that patients use the medication under the guidance of the doctor, and should not use the medication without authorization. Patients should seek medical advice if the swelling and redness of the injection site do not subside.