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Mononucleosis, also called mono, is an infection that is usually caused by the Epstein-Barr virus. Mono is spread through contact with saliva, mucus from the nose and throat, and sometimes blood or semen.
You can get mono by kissing a person who is infected. Or you may get it by sharing a drinking glass or eating utensils with someone who has mono. That person may not be sick at the time or may have had mono long before.
Symptoms include a fever and a very sore throat. You may also have swollen glands and tonsils and feel weak and tired.
Mono may cause your spleen to swell. The spleen is an organ in the upper left side of your belly. A blow to the belly can cause a swollen spleen to break open. In very rare cases, the spleen may burst on its own.
Most people get better in 2 to 4 weeks. But it may take several more weeks before your normal energy is back. The lymph nodes in your neck may be larger than normal for a while. Getting lots of rest and keeping your schedule light will help you feel better. Time helps you recover.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
Call 911 anytime you think you may need emergency care. For example, call if:
Call your doctor or nurse advice line now or seek immediate medical care if:
Watch closely for changes in your health, and be sure to contact your doctor or nurse advice line if:
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Current as of: October 31, 2022
Author: Healthwise Staff
Medical Review:Adam Husney MD - Family Medicine & E. Gregory Thompson MD - Internal Medicine & Caroline S. Rhoads MD - Internal Medicine
Care instructions adapted under license by your healthcare professional. If you have questions about a medical condition or this instruction, always ask your healthcare professional. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.
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