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The spleen (which is an organ that is actually a big lymph node) ruptures in about 0.5% of people with mononucleosis. Approximately 90% of these are male. Rupture usually occurs during the second or third week of the illness. The person is feeling better and resumes strenuous activities and thus endangers him- or herself. In the event of this complication, doctors may surgically remove the spleen.
Airway obstruction occurs in 1 out of every 100 to 1,000 cases of mononucleosis. It may occur at any age but is more common in young children. Corticosteroids may be used to treat this complication.
Autoimmune hemolytic anemia (the body destroys the red blood cells) occurs in 1-3% of people with mononucleosis. It usually becomes clinically apparent during the second or third week of illness. Corticosteroids may be used to treat this complication.
Thrombocytopenia, which is a decrease in platelets in the blood, has been noted in up to 50% of people with mononucleosis. It is usually mild and not life threatening. If severe, corticosteroids may be used to treat this complication.
Hepatitis caused by the Epstein-Barr virus occurs in 80-90% of people with mononucleosis. It is usually mild and goes away by itself.
Neurological complications rarely may occur. These might include seizures, Guillain-Barre syndrome, Bell palsy, transverse myelitis, encephalitis, meningitis, and cranial nerve palsies. Corticosteroids may be used to treat these complications.
Complications involving the heart, lungs, or kidneys rarely occur.





