The soreness of the arm after taking the new coronavirus vaccination for half a year may be caused by irritation of muscle tissues and infection caused by the vaccine. It is necessary to consult the doctor in time and follow the doctor’s instructions to give physical therapy as well as medication and debridement treatment. 1. Vaccine stimulation of muscle tissue: If the drug is not absorbed in time after the new coronavirus vaccination, it will stimulate aseptic inflammation in the tissues around the injection site. Inflammation can lead to persistent arm soreness, appearing to take the new crown virus prophylaxis arm soreness for half a year. You can massage, hot compresses and other ways to promote drug absorption, soreness symptoms are serious, or under the guidance of a doctor to take anti-inflammatory drugs for treatment, such as ibuprofen extended-release capsules. 2. Infection: If the skin is not thoroughly sterilized before inoculation or the needle hole is contaminated after inoculation, it is easy to cause infection, and there is a new coronavirus vaccination arm soreness for half a year. In addition to arm soreness, it may also be accompanied by local skin redness and swelling, or even ulcers at the site of the needle hole. You need to follow the doctor’s instructions to use antibiotics to control the infection, such as cefadroxil capsules, acetylspiramycin tablets and so on. If necessary, go to the hospital for debridement. If the arm pain lasts for more than a week or is accompanied by other physical symptoms, it is recommended that the patient seek medical attention as soon as possible to complete the relevant examinations and take targeted treatment. Drugs need to be used under the guidance of a professional physician, and should not be used arbitrarily on their own.