- Severe fatigue
- Sore throat, which sometimes can be very severe
- Chills, followed by a fever
- Muscle aches
After a day or two, someone with mono may also have:
- Swollen lymph nodes
- Jaundice (a yellow tinge to the skin and eyes)
- A measles-like skin rash anywhere on the face or body. Sometimes the rash develops suddenly after you’ve taken amoxicillin for a severe sore throat.
- Tiny red spots or bruise-like areas inside the mouth, especially on the roof of the mouth (palate)
- Soreness in the upper-left abdomen, from an enlarged spleen
When to Call the Doctor
Call your doctor about mononucleosis if:
- You develop severe abdominal pain, which may be a sign of a ruptured spleen. Seek emergency medical treatment immediately.
- You have the symptoms of mono -- especially for longer than 10 days -- or you have a severe sore throat for more than a day or two. You need to see a doctor to rule out other illnesses, such as strep throat.
- You develop swollen lymph nodes all over your body, which can also be a sign of some other illnesses.
- You have severe, persistent headache and a stiff neck, which might be signs of meningitis.
- You develop a rash consisting of many tiny red spots (which doctors call petechiae), which could be a sign of a low platelet count or other serious illness such as meningitis.