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Complications
By Mayo Clinic staff
Enlargement of the spleen
Among significant complications of mononucleosis is enlargement of the spleen. In extreme cases, your spleen may rupture, causing sharp, sudden pain in the left side of your upper abdomen. If such pain occurs, seek medical attention immediately — you may need surgery.
Liver issues
Problems with your liver also may occur:
- Hepatitis. You may experience mild liver inflammation (hepatitis).
- Jaundice. A yellowing of your skin and the whites of your eyes (jaundice) also occurs occasionally, usually in people older than 35.
Less common complications
Mononucleosis can also result in the following less common complications:
- Anemia — a decrease in red blood cells and in hemoglobin, an iron-rich protein in red blood cells
- Thrombocytopenia — low count of platelets, which are blood cells involved in clotting
- Inflammation of the heart
- Complications involving the nervous system (meningitis, encephalitis, Guillain-Barre syndrome)
- Swollen tonsils, leading to obstructed breathing
The Epstein-Barr virus can cause much more serious illness in people who have impaired immune systems, such as people with HIV/AIDS or people taking drugs to suppress immunity after an organ transplant.
