Is Mono Contagious?

Mononucleosis—commonly known as mono—is a contagious viral illness that primarily affects teens and young adults, though children and older adults can also get it. Most mono cases are caused by the Epstein-Barr Virus (EBV), which spreads through saliva and other body fluids.

Because of this, mono is often referred to as the “kissing disease”, but it can be spread in other ways, too. Here’s everything you need to know about how mono spreads, how long it lasts, and how to feel better if you catch it.

How Is Mono Spread?

Mono is contagious and spreads through saliva, respiratory droplets, and other forms of close contact. It can be transmitted by:

• Kissing
• Coughing or sneezing near others
• Sharing drinks, utensils, or food
• Touching contaminated surfaces and then touching your mouth or face

Even people without active symptoms can carry and transmit the Epstein-Barr virus, making mono more difficult to avoid.

How Long Is Mono Contagious?

You are most contagious while experiencing symptoms, which typically last 2 to 4 weeks. However, the virus can remain in your system long after you start feeling better.

• People can remain contagious for months after symptoms subside.
• EBV can stay dormant in your body for life.
• In some cases, the virus can reactivate, and you could still pass it on—even if you feel completely fine.

Can Mono Be Spread Through the Air?

Yes. Although kissing is a well-known cause, mono is also spread through airborne droplets from coughing or sneezing. That means:

• Close indoor contact increases your risk
• Shared surfaces or objects (like toothbrushes or water bottles) can spread the virus
• Children and teens in schools or colleges are especially vulnerable

Symptoms of Mono

Symptoms usually appear 4 to 6 weeks after exposure to the virus and can vary in intensity. Common symptoms include:

• Extreme fatigue
• Fever
• Sore throat
• Headache
• Loss of appetite
• Swollen lymph nodes (neck, armpits, or groin)
• Muscle aches or weakness
• Enlarged spleen or liver
• Skin rash

If you notice sharp pain in the upper left abdomen, seek immediate care—it could be a sign of spleen rupture, a rare but serious complication.

How to Treat Mono

There is no cure or vaccine for mono, and antibiotics don’t help because it's caused by a virus. Treatment focuses on managing symptoms while your body recovers.

Recommended Home Remedies:

• Rest: Your body needs time to fight the infection
• Hydration: Drink plenty of fluids to stay hydrated
• Pain Relief: Use over-the-counter pain relievers like ibuprofen (Advil®) or acetaminophen (Tylenol®)
• Sore Throat Relief: Try lozenges, warm saltwater gargles, or throat sprays
• Avoid Strenuous Activities: No contact sports or intense workouts for at least 4 weeks, especially if your spleen is enlarged

Can You Prevent Mono?

There’s no vaccine for mono, but you can reduce your risk with these precautions:

• Avoid sharing drinks, food, or utensils
• Don’t kiss or have close contact with someone showing symptoms
• Wash your hands frequently
• Stay home when you’re sick to avoid spreading viruses to others

When to See a Doctor

Call your healthcare provider if you have mono and experience:

• Difficulty breathing or swallowing
• Severe abdominal pain
• Fainting or dizziness
• High fever lasting more than a few days
• Unusual weakness in arms or legs

Get Expert Mono Care at BASS Medical Group

If you suspect mono or are dealing with lasting fatigue, sore throat, or other symptoms, the Primary Care Providers at BASS Medical Group are here to help. We offer expert diagnosis, symptom relief strategies, and follow-up care across Walnut Creek, Oakland, and the Bay Area.

Book an appointment today to get back on the path to feeling better.