The vaccine with a tic in the arm is BCG. BCG vaccine is a live bacterial vaccine by attenuated bovine tuberculosis bacillus, thus activating the immune cell capacity, mainly for the prevention of tuberculosis, treatment of asthma and bladder cancer, adjuvant treatment of tumors, etc., and its contraindications for patients with severe cardiovascular disease, chronic kidney disease, etc.. BCG vaccination can often appear after the fever, dyspnea, urinary frequency and urgency, joint pain and other adverse reactions. When receiving BCG vaccination, you should follow the doctor’s instructions, you should observe the vaccination for a period of time without serious adverse reactions before leaving, when there are serious adverse reactions such as respiratory distress, fainting and other symptoms, you should be treated under the guidance of a professional doctor.