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Side effects from a MMR vaccine can include fevers, rash, swelling of the glands in the cheek or neck, seizures (jerking or staring) caused by fever, temporary pain and stiffness in the joints, low blood platelet count, allergic reactions, deafness, long-term seizure disorders, coma, permanent brain damage, encephalopathy, chronic arthritis, and thrombocytopenic purpura (blood disorder).
The measles is a serious viral disease that infects the respiratory system. It is highly contagious, and easily spread by cough or sneeze. Measles was nearly eradicated in the U.S. and Canada after the measles vaccine was used widely. The mumps is a viral disease that causes severe, painful swelling of the salivary glands. The virus is easily spread when sick people cough or sneeze, or when healthy people touch contaminated items. Mumps may infect the central nervous system, pancreas, or testes. Rubella is a highly contagious viral disease. It can be spread through the air or by physical contact with an infected person. Symptoms of rubella include a rash all over the body, bloodshot eyes, and muscle pain. It can be dangerous to pregnant women, because rubella can cause miscarriage or birth defects.