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Complications could include:
Congestive heart failure (CHF) is a chronic condition that affects the chambers of your heart. CHF refers to fluid buildup around your heart.
Enlarged spleen (splenomegaly) affects the spleen, which found on the left side of the body, below the rib cage. Infections, like mononucleosis, are among the most common causes of splenomegaly.
An abnormal heart rhythm (arrhythmia) is a change in the heart's beating pattern. There are many different types with different causes and effects. Possible symptoms are feeling faint, chest pain, and sweating.
An arrhythmia occurs when electrical impulses, which direct and regulate heartbeats, don't function properly. Heart arrhythmias are common and usually harmless.