# What is infectious mononucleosis (mono)? Canonical page: https://clinicsjo.com/en/faq/what-is-infectious-mononucleosis-mono-symptoms-infection-recovery Language: en Category: infectious Publisher: ClinicsJo Published: 2026-09-13T08:09:52.196Z Content updated: 2026-09-13T08:09:52.196Z Translation (ar): https://clinicsjo.com/ar/faq/what-is-infectious-mononucleosis-mono-symptoms-infection-recovery Infectious mononucleosis, also known as "mono" or the "kissing disease," is a common viral infection that spreads primarily among adolescents and young adults. The most common cause of this condition is the Epstein-Barr virus (EBV), a virus that is widespread globally and infects most people at some point in their lives. While children infected with the Epstein-Barr virus may not show symptoms, adolescents and young adults are the most susceptible to developing the characteristic symptoms of mono. ## How does infectious mononucleosis spread? The Epstein-Barr virus and other viruses that cause mono spread mainly through body fluids, especially saliva [\[1\]](). This means the infection can be transmitted through kissing, hence the name "kissing disease." The virus can also spread by sharing food, drinks, eating utensils, or lip balm with an infected person. In less common cases, the virus can be transmitted via blood and semen during sexual contact, or through blood transfusions or organ transplants [\[1\]](). An infected person can spread the virus for weeks, even before symptoms appear. Once infected, the Epstein-Barr virus remains latent (inactive) in the body and may be reactivated later, which can lead to the virus spreading again, especially in people with weakened immune systems [\[3\]](). ## What are the main symptoms of infectious mononucleosis? Symptoms of mono usually appear four to six weeks after infection, and may appear faster in young children. Symptoms often develop slowly and may not all appear at once [\[1\]](). Common symptoms include: - Severe fatigue [\[1\]]() - Fever [\[1\]]() - Sore throat [\[1\]]() - Head and body aches [\[1\]]() - Swollen lymph nodes in the neck and armpits [\[1\]]() - Skin rash [\[1\]]() - In some less common cases, swelling of the liver or spleen, or both, may occur [\[1\]]() Mono symptoms can resemble those of other diseases, making diagnosis sometimes difficult. A doctor may diagnose mono based on symptoms and a physical examination that includes checking the lymph nodes, tonsils, liver, and spleen for swelling. In some cases, the doctor may order a blood test to confirm the diagnosis [\[1\]](). For more information on symptoms, infection, and recovery, you can visit [Infectious Mononucleosis (Mono): Symptoms, Infection, and Recovery (Arabic)](). ## Recovery and Care Most people with infectious mononucleosis improve within two to four weeks. However, fatigue may persist for several additional weeks, and sometimes symptoms may last for six months or more [\[1\]](). There is no specific treatment for mono because it is a viral disease, which means antibiotics are ineffective against it [\[1\]](). Treatment focuses on relieving symptoms and supporting the body during the recovery period: - **Drink plenty of fluids:** To help avoid dehydration [\[1\]](). - **Get plenty of rest:** Rest is essential for the body to recover [\[1\]](). - **Take over-the-counter medications:** To relieve pain and fever. Aspirin should be avoided for children and adolescents due to the risk of Reye's syndrome, a rare and serious condition that affects the brain and liver [\[1\]](). If symptoms are severe, the doctor may suggest additional treatments based on the affected organs. It is important to avoid strenuous exercise and contact sports for about a month or until full recovery to protect an enlarged spleen from rupturing, which can cause a medical emergency [\[1\]](). ## When should I see a doctor? You should consult a doctor if you experience symptoms of mono, especially if the symptoms are severe or persist for a long time. It is very important to see a doctor immediately if you feel severe pain in the upper left part of the abdomen, as this may indicate a ruptured spleen, which is an emergency condition requiring immediate medical attention [\[1\]](). ## Medical references - [Infectious Mononucleosis]() - [About Epstein-Barr Virus (EBV)]() General health education; not a substitute for individualized clinical assessment. Citation URL: https://clinicsjo.com/en/faq/what-is-infectious-mononucleosis-mono-symptoms-infection-recovery#answer