For most people, mono is not a huge health threat; it's just a major annoyance. Typically, most people recover from the virus within a month or two. However, mononucleosis can sometimes lead to other health complications.

If you have been suffering from symptoms of mononucleosis for more than two months, or if you have an extremely high fever, severe weakness, or difficulty seeing, you should contact your doctor. Some complications of the illness include:

• Chronic mononucleosis (symptoms lasting longer than 6 months in recurrent episodes)
• Mild hepatitis (inflammation of the liver)
• Jaundice
• Anemia
• Chronic Fatigue Syndrome
• Tonsillitis
• Pericarditis and myocarditis (inflammation of the heart)
• Encephalitis (inflammation of the brain)
• Meningitis
• Ruptured Spleen