Mumps is a viral infection that causes swelling in the salivary glands

Mumps is an infection caused by the mumps virus, which spreads through respiratory droplets—the tiny particles released when an infected person coughs, sneezes, or talks. The hallmark sign is swelling and tenderness in the salivary glands, usually on both sides of the face below the ears, which gives the cheeks a puffy appearance. Most people develop symptoms 16 to 18 days after exposure, though the range can be 12 to 25 days.

The infection was once common in children before the MMR vaccine became standard. Today it is rare in vaccinated populations but still occurs in unvaccinated or partially vaccinated groups. A person with mumps is most contagious from about two days before the swelling starts until five days after it begins.

Key Takeaways

  • Mumps causes painful swelling in the salivary glands, usually on both sides of the face, and spreads through respiratory droplets from coughing or sneezing.
  • Symptoms typically appear 16 to 18 days after exposure and include fever, headache, muscle aches, and loss of appetite before the characteristic swelling develops.
  • Most people recover on their own within a week or two, but mumps can occasionally cause serious complications including meningitis, encephalitis, or hearing loss.
  • The MMR vaccine prevents mumps in about 88 percent of people who receive two doses, and protection increases with both doses completed.

Early symptoms come before the swelling appears

The first signs of mumps are often general and easy to mistake for a cold or flu. People typically experience fever, headache, muscle aches, fatigue, and loss of appetite for a few days before the distinctive swelling develops. Some people have pain when eating, drinking, or chewing.

The salivary gland swelling usually appears on both sides of the face at the same time, though it can start on one side and spread to the other. The swelling is tender to the touch and makes the face look puffy or rounded. In some cases, only one gland swells, or swelling occurs in just one location. The swelling typically peaks within three to seven days and then gradually goes away over the next week or two.

Serious complications can develop, though they are uncommon

Most people with mumps recover without lasting problems. However, the virus can spread to other parts of the body and cause complications. Meningitis—inflammation of the membrane around the brain and spinal cord—occurs in a small percentage of mumps cases and causes severe headache, stiff neck, and sensitivity to light. Encephalitis, inflammation of the brain itself, is rarer but more serious.

Mumps can also cause hearing loss, which may be temporary or permanent and can affect one or both ears. Inflammation of the pancreas, testicles (in males), or ovaries (in females) can occur and cause pain in those areas. Miscarriage risk may increase if mumps develops during the first trimester of pregnancy, though this is uncommon. Most of these complications resolve on their own, but some people experience lasting effects.

Diagnosis relies on symptoms and sometimes laboratory testing

A doctor typically diagnoses mumps based on the characteristic swelling of the salivary glands combined with the history of exposure and vaccination status. No single test is required for diagnosis when the clinical picture is clear.

If confirmation is needed—particularly early in the illness or when symptoms are unclear—a doctor may order a blood test to detect mumps antibodies or a throat swab to test for the virus itself. These tests are most reliable when done within the first few days of illness. A spinal tap may be performed if meningitis is suspected.

Treatment focuses on managing symptoms while the body fights the infection

There is no medicine that kills the mumps virus, so treatment aims to relieve discomfort while the immune system clears the infection. Over-the-counter pain relievers like acetaminophen or ibuprofen can reduce fever and ease the pain of swollen glands. Applying warm or cold compresses to the swollen areas may provide relief.

Staying hydrated is important, though drinking may be uncomfortable. Soft foods that do not require much chewing—such as soup, yogurt, mashed potatoes, or applesauce—are easier to manage than hard or crunchy foods. Most people feel well enough to resume normal activities within a week or two, though some fatigue may linger.

The MMR vaccine prevents mumps in most people who receive it

The mumps vaccine is given as part of the MMR (measles, mumps, rubella) combination vaccine. The standard schedule calls for two doses: the first at 12 to 15 months of age and the second at 4 to 6 years old. Two doses provide protection in approximately 88 percent of vaccinated people. A single dose is about 78 percent effective, so completing both doses significantly increases protection.

Immunity from the vaccine can wane over time, which is why some vaccinated people still develop mumps, particularly during outbreaks. Vaccination also reduces the severity of illness if infection does occur. People born before 1957 are generally considered immune because mumps was widespread then, though this is not absolute. Healthcare workers and people planning travel to areas with mumps outbreaks may benefit from a booster dose.

Mumps spreads easily in unvaccinated groups

The mumps virus spreads through respiratory droplets released when an infected person coughs, sneezes, or talks. Close contact—within about six feet—makes transmission more likely. Touching contaminated surfaces and then touching your mouth or nose can also spread the virus, though this is less common than respiratory transmission.

An infected person is contagious from about two days before swelling appears until five days after it starts. People who are unvaccinated or only partially vaccinated are at highest risk. Outbreaks tend to occur in settings where unvaccinated people live or work closely together, such as schools, colleges, or workplaces. Once someone has had mumps, they develop lifelong immunity.

Frequently Asked Questions

Can you get mumps more than once?

No. Once you have had mumps, your immune system produces antibodies that protect you for life. Reinfection is extremely rare. If someone develops mumps symptoms a second time, it is almost certainly a different illness.

Is mumps dangerous for adults?

Mumps is generally more serious in adults than in children. Adults are more likely to develop complications such as meningitis, encephalitis, or inflammation of the testicles or ovaries. Hospitalization may be needed if complications develop, though most adults still recover fully.

What should I do if I think I have mumps?

Contact your doctor to confirm the diagnosis. Stay home and avoid close contact with others for at least five days after swelling starts to prevent spreading the virus. Use over-the-counter pain relievers, apply warm or cold compresses, and eat soft foods. Seek immediate care if you develop severe headache, stiff neck, confusion, or difficulty hearing.

Can the MMR vaccine give you mumps?

No. The MMR vaccine contains a weakened form of the virus that cannot cause mumps. Some people experience mild side effects like soreness at the injection site or low fever, but these are not mumps. The vaccine cannot cause the infection.

How long does mumps last?

The swelling typically peaks within three to seven days and gradually resolves over one to two weeks. Most people feel well enough to return to normal activities within a week or two, though some fatigue may persist longer. Complications, if they develop, may take longer to resolve.