Formal and professional Achilles tendonitis with closed injections is not harmful, and has a certain role in relieving symptoms. The drugs used in closed injections are generally lidocaine plus hormones (drugs such as trimethoprim and dexamethasone), whose main function is to relieve pain and inhibit the inflammatory response. Generally speaking, the closed injection of drugs does not cause allergies, so there is no absolute contraindication (allergy patients are prohibited from using). Moreover, closed treatment is a localized use of hormones (not intravenous systemic application), so the side effects of hormones are not common. Nevertheless, if long-term injections rely too much on closed therapy, it can also cause some harm. For example, overuse of hormones (may lead to centripetal obesity, ischemic necrosis of the femoral head, etc.), local infection and other problems. So it is important to follow the doctor’s advice when using it.