People rarely die from mono. But some complications of mono can be life threatening. One complication of mono is a ruptured spleen. Seek medical help right away if you have any of the following symptoms of a ruptured spleen:
Other rare complications are:
- Sharp pain in the upper left side of your belly near the ribs
- Confusion
- Fainting or feeling light-headed
- Brain infections such as encephalitis or meningitis
- Liver swelling
- Swelling of the testes in boys (orchitis)