What Is Mumps? A Plain-Language Guide to Symptoms, Causes, and How to Prevent It
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 17, 2026
Quick Answer
Mumps is a viral illness that usually causes painful swelling of the parotid salivary glands on one or both sides of the face. It spreads through saliva droplets, contaminated surfaces and close contact. There is no specific medicine; recovery takes 3 to 10 days with rest, fluids and isolation. Two doses of the MMR vaccine prevent it.
What the research says
Vaccine protection: A 2026 matched case-control study in China (1,405 mumps cases under age 15 and 2,810 controls) found that at least one dose of a mumps-containing vaccine gave about 75.7% protection (95% CI 64.8%–83.2%). Protection was higher in older children (86.7% at ages 6–11 and 92.9% at 12 and older). [7]
Why outbreaks still happen: A 2026 review notes that where the two-dose MMR vaccine is routine, mumps incidence has fallen markedly, but sporadic outbreaks occur through breakthrough infections, driven largely by waning immunity. It also highlights that vaccination reduces complications such as meningitis and orchitis, even in breakthrough cases. [6]
What Is Mumps?
Mumps is an illness caused by a virus. It usually affects the glands on each side of the face. These glands, called parotid glands, make saliva. When they swell, they may be tender or painful. [1]
You have saliva glands beyond the parotid glands. There are three pairs of major salivary glands — parotid, sublingual, and submandibular — and each gland has its own tube (called a duct) leading from the gland to the mouth.
Mumps is not common in the United States because of vaccines. But outbreaks do happen. People who are not vaccinated are at high risk of infection. Vaccinated people who do get mumps usually have milder symptoms and fewer complications.
There is no specific medicine for mumps. Treatment relieves pain and discomfort.
The parotid glands sit on each side of the face — their swelling is what gives mumps its puffed-cheek look.
What Are the Symptoms of Mumps?
Symptoms of mumps show up about 2 to 3 weeks after exposure to the virus. Some people may have no symptoms or very mild symptoms.[1]
The first symptoms may be similar to flu symptoms such as fever, headache, muscle aches or pain, not wanting to eat, and tiredness.
Swelling of the salivary glands usually starts within a few days. Symptoms may include swelling of one or both glands on the sides of the face, pain or tenderness around the swelling, and — less often — swelling of glands below the floor of the mouth. A common symptom of mumps is painful swelling on one or both sides of the face.
How Does Mumps Spread?
Mumps is caused by a virus. When someone has mumps, the virus is in saliva. Coughing or sneezing can release tiny droplets with the virus into the air.[1]
You can get the virus in three main ways, and outbreaks in the United States most often happen where people live or work in close contact, such as college campuses, summer camps, and schools:
How You Can Catch It | How It Happens |
Breathing in droplets | Inhaling tiny droplets with the virus released when a sick person coughs or sneezes |
Touching contaminated surfaces | Touching a surface where droplets have landed, then touching your face |
Direct contact | Close personal contact, such as kissing or sharing a water bottle |
Mumps travels through saliva droplets — by air, by surfaces, and by close contact.
When Should I See a Doctor?
See your healthcare provider if you or your child has symptoms of mumps. Mumps spreads very easily from a few days before the swelling starts until about five days after. If you think you have mumps, let the clinic know before you go — the clinic staff likely will take steps to prevent the spread of disease.[1]
Other conditions may have similar symptoms, so it's important to get a quick diagnosis.
If you think your child has mumps, call your care provider if your child develops a fever of 103 F (39 C) or greater, trouble eating or drinking, confusion or disorientation, stomach pain, or pain and swelling of the testicles.
In the meantime, rest as much as possible, use pain relievers you can get without a prescription such as ibuprofen (Advil, Motrin IB) and acetaminophen (Tylenol), and use a cold or warm cloth over swollen salivary glands.
What Causes Mumps?
Mumps is caused by a type of germ called a virus. When someone has mumps, the virus is in saliva. Coughing or sneezing can release tiny droplets with the virus into the air.[1]
Outbreaks in the United States most often happen where people live or work in close contact. These may include college campuses, summer camps, and schools.
Who Is at Higher Risk?
The single biggest risk factor is vaccination status. People who are not vaccinated are at high risk of infection. Most people who have had the mumps vaccines — called fully vaccinated — are protected from mumps infections. For some people, vaccine protection may go down over time, but when fully vaccinated people get mumps, they usually have milder symptoms and fewer complications.[1]
Can Mumps Cause Complications?
Complications of mumps are more likely among people who aren't vaccinated. They can happen even if a person didn't have swollen salivary glands. Complications happen when the virus reaches other tissues in the body.[1]
Complication | What Happens | Who It Affects Most |
Swollen testicles (orchitis) | Causes severe pain; a swollen testicle may shrink in size and lower fertility | More common after puberty |
Swollen ovaries (oophoritis) | Causes pain, upset stomach, vomiting, and fever; doesn't seem to affect fertility | More likely after puberty |
Encephalitis | Inflammation in the brain that may damage tissues; can cause changes in consciousness, seizures, and loss of muscle control | Anyone with mumps |
Meningitis | Inflammation of the membranes around the brain and spinal cord; causes headache, fever, and neck stiffness; rarely causes long-term problems | Anyone with mumps |
Hearing loss | Can happen suddenly, usually in one ear; it is sometimes temporary but can be permanent | Anyone with mumps |
Pancreatitis | Swelling damages the pancreas; symptoms include pain or tenderness near the stomach, upset stomach, vomiting, and fever | Anyone with mumps |
Miscarriage | Getting mumps during the first 12 weeks of pregnancy may increase the risk that a pregnancy will end | Pregnant people in the first trimester |
How Is Mumps Diagnosed?
A care provider may diagnose mumps based on typical symptoms and known exposure to mumps. Tests used to look for the virus and diagnose mumps include a test of a sample from the mouth, a blood test that may show an immune system reaction to the virus, and — less commonly — a test of a sample of urine.[2]
How Is Mumps Treated?
Mumps has no specific treatment, so care focuses on easing symptoms and preventing the infection from spreading. Most people recover within 3 to 10 days. Steps you can take to aid recovery and lessen symptoms include rest, over-the-counter pain relievers such as ibuprofen (Advil, Motrin IB) and acetaminophen (Tylenol), a cold or warm cloth for swollen salivary glands, a cold cloth or ice pack for swollen testicles, and drinking plenty of fluids.[2]
It's important to isolate yourself or your child during the illness to prevent spreading the infection. Avoid contact with others until at least five days after the start of swollen salivary glands.
From exposure to recovery: the typical mumps timeline, including the isolation period that stops the spread.
Can Mumps Be Prevented?
Most people who have had the mumps vaccines — called fully vaccinated — are protected from mumps infections. The mumps vaccine is a part of the recommended childhood vaccinations. It's usually given as a combined measles-mumps-rubella (MMR) vaccine on this schedule:[1] [4]
Dose | When It's Given |
First dose | Between the ages of 12 and 15 months |
Second dose | Between the ages of 4 and 6 years, before entering school |
Another version of MMR also includes the vaccine against the virus that causes chickenpox (the varicella-zoster virus). That vaccine, called MMRV, is not used for the first dose in the standard childhood schedule.
If you haven't had two doses or aren't sure, talk to your healthcare provider. You may need two doses of the vaccine or a booster — especially if you're in a high-risk setting or an outbreak. The following people may need proof of vaccination or more doses: college students, people in the military, international travelers, and healthcare workers.
If you're not sure if you're vaccinated, a blood test can show whether you have antibodies to mumps. If you have antibodies, your immune system would fight a mumps infection and you don't need another vaccine. People who were born before 1957 were likely exposed to the virus and are likely immune.
The mumps vaccine is made from a weak but still infectious mumps virus. A typical immune system can handle this weak virus easily. But people with immune systems that won't respond quickly or strongly to the vaccine don't usually get this vaccine, with some exceptions when benefits outweigh risks. This type of vaccine is also not suggested for people who are pregnant.
Is the MMR Vaccine Safe?
The MMR vaccine is safe and effective. Most people have no side effects. When mild side effects do happen, they may include soreness at the shot site, fever, a rash at the site of the shot, or swelling of the glands in the cheeks or neck. In rare cases, some people may have pain and stiffness in joints, seizures, a short-term drop in blood platelets, or a rash. Severe allergic reactions are rare — people who have a severe allergic reaction to the first dose aren't given a second dose, and people won't get the vaccine if they've had a severe allergic reaction to an ingredient in it.
Extensive studies in several countries have shown that there is no link between the MMR or MMRV vaccines and autism. The original study that suggested this connection in 1998 was based on scientific errors, and it was removed from the scientific record in 2010. Extensive reports from the American Academy of Pediatrics, the National Academy of Medicine, and the Centers for Disease Control and Prevention conclude that there is no scientifically proven link between the MMR vaccine and autism.
Conclusion
Mumps is a viral illness famous for the puffed-cheek swelling of the salivary glands on each side of the face. It spreads easily through saliva — by air, by surfaces, and by close contact — which is why outbreaks still appear in close quarters like colleges, camps, and schools. Symptoms start flu-like about 2 to 3 weeks after exposure, and most people recover in 3 to 10 days with simple comfort care and five days of isolation. The real concern is for people who aren't vaccinated: they face both a high risk of infection and the worst complications, from orchitis to encephalitis to hearing loss. Two doses of the MMR vaccine remain the best shield, and the science on its safety is clear and settled.
Learn more. If you or your child has facial swelling, fever, and flu-like symptoms — especially after exposure to someone with mumps — contact your healthcare provider, and tell the clinic about your suspicion before you arrive so staff can prevent further spread. Keep your child away from others for at least five days after the swelling starts. If your child is overdue for their MMR doses, or you're unsure of your own vaccination status, a quick conversation with your provider (or a simple antibody blood test) can close the gap. For more plain-language health guides, visit Rinnit.com.
Frequently Asked Questions
What is mumps in simple terms?
Mumps is a viral illness that usually causes painful swelling of the parotid glands — the saliva-making glands on each side of the face.
How long does mumps last?
Most people recover within 3 to 10 days. There is no specific medicine for mumps; treatment focuses on comfort: rest, fluids, and over-the-counter pain relievers.
How does mumps spread?
The virus lives in saliva and spreads through droplets from coughing or sneezing, by touching contaminated surfaces then touching your face, or through direct contact like kissing or sharing a water bottle.
How soon do symptoms appear after exposure?
Symptoms usually show up about 2 to 3 weeks after exposure. The first signs are flu-like — fever, headache, muscle aches, tiredness — and salivary gland swelling usually follows within a few days.
When is mumps contagious?
Mumps spreads very easily from a few days before the swelling starts until about five days after. You should avoid contact with others until at least five days after the start of swollen salivary glands.
What are the complications of mumps?
Complications — more likely in unvaccinated people — include swollen testicles (orchitis), swollen ovaries (oophoritis), encephalitis, meningitis, hearing loss, pancreatitis, and an increased risk of miscarriage if mumps occurs in the first 12 weeks of pregnancy.
When should I call the doctor for a child with mumps?
Call your care provider if your child develops a fever of 103 F (39 C) or greater, trouble eating or drinking, confusion or disorientation, stomach pain, or pain and swelling of the testicles.
Who needs the MMR vaccine?
Children get two doses (at 12–15 months and 4–6 years). College students, military personnel, international travelers, and healthcare workers who aren't sure of their status may need doses or a booster. A blood test can check for antibodies, and people born before 1957 are likely already immune.
How is mumps diagnosed?
A provider looks for swelling of the salivary glands and asks about exposure and vaccines. A cheek swab or blood test can confirm the infection.
Can you get mumps if you are vaccinated?
Yes, but it is less likely, and vaccinated people usually have a milder illness with fewer complications. Two doses of the MMR vaccine give the best protection.
Related Reading
MMR Vaccine: Schedule, Effectiveness, Side Effects, and Who Should Avoid It explains the vaccine that protects against mumps, measles and rubella.
Parotitis: Understanding Parotid Gland Swelling covers causes of swollen parotid glands besides mumps.
Orchitis: Symptoms, Causes, Diagnosis, Treatment and Prevention Guide explains testicle inflammation, a known complication of mumps.
Viral Meningitis: Symptoms, Causes, and Management describes a viral infection of the brain's lining and its care.
References
Mayo Clinic Staff. Mumps - Symptoms and causes. Mayo Clinic. November 27, 2025. https://www.mayoclinic.org/diseases-conditions/mumps/symptoms-causes/syc-20375361
Mayo Clinic Staff. Mumps - Diagnosis and treatment. Mayo Clinic. November 23, 2022. https://www.mayoclinic.org/diseases-conditions/mumps/diagnosis-treatment/drc-20375366
Centers for Disease Control and Prevention. Clinical Overview of Mumps. CDC. January 17, 2025. https://www.cdc.gov/mumps/hcp/clinical-overview/index.html
U.S. Department of Health and Human Services. Mumps. HHS.gov. Content last reviewed September 3, 2026. https://www.hhs.gov/vaccines/diseases/mumps/index.html
Rausch-Phung EA, Davison P, Morris J. Mumps. StatPearls [Internet], NCBI Bookshelf. Updated May 1, 2024. https://www.ncbi.nlm.nih.gov/books/NBK534785/
Otani N, et al. Mumps Vaccination Policies and Epidemiological Consequences: A Comparative Review of the United States and Japan. Epidemiologia (Basel). 2026;7(4). PMID 42496544. https://doi.org/10.3390/epidemiologia7040095
Liu H, et al. Evaluation of the real-world protective effect of mumps-containing vaccines among children under 15 years old in Taizhou: A 1:2 matched case-control study. PLoS One. 2026;21(9):e0359417. PMID 42804452. https://doi.org/10.1371/journal.pone.0359417
Medical disclaimer
This article is for general informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment decisions.
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