What are the symptoms of mononucleosis (mono)?

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Symptoms of mononucleosis (mono) are feeling tired, sleeping more than usual, sore throat, swollen lymph nodes and decreased appetite. If you have these symptoms, your doctor will evaluate you for mono and other possible causes, such as strep throat.
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
The symptoms of infectious mononucleosis include:
  • fever
  • extreme fatigue
  • swollen glands
  • sore throat
  • painful swallowing
  • enlarged lymph nodes in neck and under arms
  • enlarged spleen
  • enlarged liver
  • anemia
  • red spots on the roof of the mouth
  • eye swelling
  • rash

The primary symptoms of mononucleosis are fatigue, sore throat, swollen lymph nodes, and fever. Other symptoms include weakness, headache, a rash, and night sweats. The symptoms usually improve in a few weeks.


Picture of swollen lymph nodes

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.