New crown booster shot arm pain is normal tissue damage or immune response, can be localized hot compresses to reduce pain, if the pain aggravated with other symptoms are considered infection, need to give anti-infection treatment. The injection site of the new crown booster is usually the arm, when the vaccine enters the arm muscle tissue, it will produce stimulation and cause pain. In addition, the booster shot as an immune agent, will also stimulate the body to produce an immune response to cause pain. This kind of pain can choose to localized hot compresses, do not need special treatment, usually a few days after the pain can be gradually relieved. When the injection site wound infection, will also lead to arm pain, and may also be accompanied by redness, swelling, pus and fever, this time need to pay attention to. If the situation is not serious, you can use erythromycin ointment under the guidance of the doctor, oral cephalosporin antibiotics for anti-infection treatment; if the wound is serious pus, you may also need to be surgically incised to drain the pus. After the injection, patients need to stay on time, avoid lifting heavy objects, go home and adjust the rest and diet structure, try not to stay up all night, do not eat spicy food, do not smoke and drink, so as not to induce or aggravate the discomfort symptoms. Keep the area clean and dry to avoid infection.