There is no clinical reason why closed injections are not recommended, but they should be performed appropriately and with attention to the doctor’s assessment. Closed injection is generally referred to as closed treatment, mainly using different doses of different concentrations of local anesthetic injected into the local tissues. The main purpose of this treatment is to maintain the function of the central nervous system, improve the nutrition of local tissues, repair the damage and relieve pain. This treatment is mainly applied to osteoarthrosis and muscle injury, but it is forbidden for patients with septic arthritis, osteomyelitis, bone tumor and other diseases, and patients with poor systemic condition or even serious cardiovascular system lesions need to be treated with caution. At the same time, patients need to actively cooperate with the doctor to use a reasonable dose of closed treatment, and in the short term after the injection may appear local swelling, fever, and need to be alert to infection. It is recommended that patients should choose to undergo closed treatment under the guidance of doctors according to their own conditions and pay more attention to their own conditions.