Joint pain after vaccination may be caused by the adverse reaction of the vaccine; it may also be caused by rheumatoid arthritis, gout and other diseases; in addition to this, we cannot rule out the possibility that it is related to trauma and so on. 1. Adverse reaction of vaccine: New Crown vaccine is a biological agent, after injection into the body, the immune system can be stimulated by a series of immune reactions to produce antibodies, there may be adverse reactions, such as muscle aches, headache, low-grade fever, weakness, etc., and a small number of joint pain and other discomforts may be accompanied. 2. Rheumatoid arthritis: joint pain after vaccination may be related to rheumatoid arthritis, which mainly involves metacarpophalangeal joints, knee joints, wrist joints, proximal phalangeal joints, etc., and accompanied by morning stiffness; in addition to the symptoms of the joints, it may also involve other organs, such as the heart and lungs. 3. Gout: If you suffer from gout, it may also cause joint pain, not necessarily caused by the new coronary vaccine. The common triggers of the disease are overwork, excessive alcohol consumption and so on. Most patients in the acute arthritis stage, mainly manifested as joint pain. 4. Trauma: If the soft tissues of the organism are inadvertently traumatized, the joints may be over-flexed and stretched under the blows of external forces, which may lead to the damage of local ligaments and bones, and thus joint pain will occur. After playing the new crown vaccine joint pain, there are more reasons, if the pain is more obvious, as soon as possible to seek medical treatment, by the face-to-face physician according to the actual situation to take targeted treatment.