If you cannot bend your fingers normally after the new crown vaccine, you need to consider the adverse effects of the vaccine, as well as injuries caused by trauma or impact to the hand. 1. Adverse reaction of vaccine: The new crown vaccine itself is an inactivated pathogen injected into the organism, thus stimulating the body to produce the corresponding resistance. After vaccination, some people may experience adverse side effects of the vaccine such as muscle aches, muscle stiffness or joint pains, which can be gradually relieved by themselves in about one week after vaccination, or can be effectively improved by local massage or physical therapy. 2. Trauma: after vaccination, the finger can not be bent normally, but also need to consider normal trauma or external impact caused by finger joint damage and muscle damage. It is recommended to go to the hospital in time for X-ray examination of the finger area to determine whether there are muscle rupture, tendon sheath inflammation and other pathologic diseases, so as to treat as soon as possible. There is no direct relationship between these symptoms and the vaccination itself. If the adverse reaction is severe or persists for more than 3 days after vaccination, it is important to seek medical attention and treatment.