Many people who have received the third shot of the New Crown vaccine experience discomfort, which may be related to muscle tension, vaccine reaction, and too fast injection speed. 1. Muscle tension: If the third booster shot is given again, due to excessive worry, fear or dread, resulting in muscle tension, the pain will be more pronounced after the injection, and many people will have some adverse reactions. At present, no special treatment is needed, and the symptoms will gradually decrease after emotional recovery. 2. Vaccine reaction: booster injection is not the same as the first two injections, the concentration of drugs may be higher, so the vaccination may produce a stronger reaction. If the symptoms are not serious, no special treatment is needed. If there are symptoms such as itching, redness, swelling, pain, etc., you should consult a doctor in time. 3. Injecting too fast: Vaccination with the new crown vaccine is usually recommended to slow down the speed, if the injection speed is too fast, the drug is not well absorbed, it may cause pain, and the local area will also have hard knot formation, can be relieved by hot compresses to alleviate the symptoms. If there is any adverse reaction after receiving the new crown vaccine, it is recommended to consult a doctor in time and target treatment according to the doctor’s advice.