LYCOS RETRIEVER 
Mononucleosis: Spleen
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The most effective treatment for infectious mononucleosis is rest, followed by a gradual return to normal activities. If the spleen is enlarged, all contact sports, heavy lifting, and jarring activity such as cheerleading, should be avoided until the enlargement has subsided completely. However exercise such as swimming, running, and other non-contact sports may be resumed. Since mononucleosis can involve the liver, it is important not to consume alcohol.
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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.
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If you have mononucleosis and feel a sudden sharp pain in your left side in the upper abdomen, go to a hospital or call 9-1-1. The pain may be a sign of a ruptured spleen, which is a very rare complication of mononucleosis.
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