Are there any side effects from the MMR vaccine?
Contracting measles, mumps, or rubella is more dangerous than any side effects from the vaccine. Though allergic reactions are possible, the MMR vaccine generally only causes mild side effects.
- Up to 17 percent of kids will experience fever.
- Up to 5 percent will have a mild rash.
- In very rare cases, some people will experience swelling of the cheeks or neck, febrile seizures, or temporary joint pain (mostly in teenagers and women).
- Children who receive MMRV may be more likely to experience side effects like rash, fever, and febrile seizures than those who get the MMR and chickenpox vaccines separately.
As with any vaccine, severe allergic reactions are rare, but possible. If you notice your child having difficulty breathing, hoarseness or wheezing, hives, paleness, weakness, dizziness, or a rapid heartbeat shortly after he receives a shot, call your doctor right away.