When one or both cheeks swell below the ears, the jaw hurts when chewing, and a fever appears, mumps becomes a possibility. It is much less common since routine vaccination, but it can still spread among children in group settings.
Why It Happens
Mumps is a viral infection that inflames the parotid salivary glands in front of and below the ears. It spreads through respiratory droplets from coughing and sneezing, and through saliva on shared items. CDC describes people as able to spread the virus from about 2 days before swelling begins to 5 days after. Before the swelling, a low-grade fever, muscle aches, poor appetite, tiredness and headache can appear, so the early stage is hard to tell from a cold.
How It Differs by Age and Stage
Mumps is reported most often in school-age children and teenagers. The incubation period is typically 2-3 weeks, and a Dutch outbreak report found a range of 15-24 days with a median of 19. Gland swelling usually builds over a few days and settles in about a week. Some infected people have mild or almost no symptoms. Complications are thought to be more frequent after puberty.
What to Do at Home
No specific antiviral treatment exists, so care focuses on comfort. Let your child rest and ask the pediatrician to confirm a pain and fever reliever dose that fits your child’s weight and age. A warm or cool compress on the swollen area, whichever feels better, can be tried. Offer soft, easy-to-chew foods such as porridge, mashed potato and yogurt. For isolation, CDC recommends staying home for 5 days after the start of gland swelling, which replaced an older 9-day recommendation; CDC, AAP and the infection control advisory committee all support the shorter period.
Common Misunderstandings
Some parents believe a vaccinated child cannot catch mumps. CDC data cited in clinical summaries put two MMR doses at roughly 88% effective, so breakthrough cases occur, though vaccinated people have lower risk of complications. In the Dutch study, two doses were linked to about 74% lower risk of orchitis and about 82% lower risk of hospitalization. Another misunderstanding is that every swollen cheek is mumps; bacterial gland infections, swollen lymph nodes and dental infections can look similar and need a doctor’s exam. A third is that swelling on one side rules mumps out, when the other side can follow days later.
When to Seek Care
If mumps is suspected, call the pediatrician before visiting so staff can limit exposure to others. Known complications include orchitis (swollen testicles), meningitis, pancreatitis and hearing loss. Go to the emergency room right away for severe headache with a stiff neck, repeated vomiting, unusual sleepiness or limpness, a seizure, or swelling that makes breathing or swallowing hard. Severe belly pain, painful swollen testicles, or new trouble hearing also need prompt care. In the United States, MMR is given at 12-15 months and 4-6 years. This information is based on U.S. and international sources; if you live elsewhere, check with a local pediatrician. This information isn’t a diagnostic tool and doesn’t replace advice from a medical professional.