Vomiting after 2 weeks of MMR vaccination is not related to the vaccination. Vomiting can be caused by unclean diet, cold, encephalitis, etc. It is recommended to consult a doctor in time for symptomatic and causative treatment. MMR vaccine is mainly used for the prevention of measles, mumps and rubella, which causes fever, allergy and other adverse reactions usually occur on the day of vaccination or the next day, vomiting two weeks after vaccination is not considered to be related to vaccination. Unclean and stimulating diet, gastrointestinal cold, encephalitis, intestinal obstruction, etc. can cause vomiting, vomiting needs to be temporarily fasting, side of the head to prevent accidental inhalation, timely medical treatment to give symptomatic supportive treatment (such as medication antiemetic cetirizine, phenelzine, gastrointestinal decompression, intravenous nutritional support, etc.), and to be identified the cause of the cause of the cause of the disease need to be directed to the cause of the treatment. To summarize, vomiting after two weeks of vaccination is generally not related to vaccination, there are many causes of vomiting, it is recommended to seek medical attention in a timely manner, under the guidance of a professional doctor for symptomatic treatment of the cause.