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Less than one in 1 million people may experience anaphylactic shock as a result of an allergic reaction to the MMR vaccine. Those experiencing anaphylactic shock will likely have a rash, body swelling, nausea and vomiting, and difficulty breathing. If you or your child experience any of these symptoms after receiving the vaccination see your doctor immediately. Call 911 in the United States (or emergency services in your country) if the person if having difficulty breathing, wheezing, or swelling of the lips or tongue.  While the reaction can be alarming, you can expect a full recovery if you get help right away. Medical staff who give vaccines are trained to handle anaphylaxis. Measles inclusion body encephalitis is a severe swelling of the brain that is the result of infection by the measles virus. It is a rare disorder that usually develops within a year of being exposed to the wild measles infection. There have only been three reported cases of this complication happening to people with the MMR vaccine, and only one of those identified the MMR vaccine as the cause.  Nausea, severe headaches, and blurred vision are symptoms of brain swelling. Visit your doctor immediately if you believe that you are experiencing encephalitis. Because the signs of autism are usually noticed at the same time that children are recommended to take the MMR vaccine, many people attribute the onset of autism to the vaccination. However, safety experts agree that the MMR vaccine does not cause non-autistic children to become autistic.  Many independent researchers have found that the MMR vaccine does not cause autism.  Autism is inborn, with researchers identifying signs as early as the 2nd trimester of pregnancy. You cannot control whether your child is or is not autistic. Causes of autism aren't yet clear, but genetics play a large role, and prenatal factors may also be involved.  The source of the MMR vaccine controversy stemmed from Andrew Wakefield, a man with a history of unethical behavior who was paid large amounts of money by lawyers to claim that vaccines caused autism. Wakefield's evidence of the vaccine causing autism was falsified, and his medical license was revoked.
Report allergic reactions. Be aware that brain swelling is an extremely rare side-effect. Understand that the MMR vaccine does not cause autism.