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Glandular fever

Also called Infectious mononucleosis, Mono, or Epstein-Barr virus infection

Glandular fever is an infection usually caused by the Epstein-Barr virus. It spreads through saliva, which is why it is sometimes called the kissing disease. It mostly affects teenagers and young adults. Symptoms usually last 2 to 3 weeks, but tiredness can last longer.

Last updated Nov 9, 2026

What it is

There is no specific treatment. Rest, fluids and pain relief help.

Avoid contact sports for a few weeks, because the spleen can become swollen and could be damaged.

Common signs

  • High temperature
  • Very sore throat
  • Swollen glands in the neck
  • Extreme tiredness
  • Aching muscles

How it is usually diagnosed

  • Blood tests

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Blood test results
  • Notes on how long symptoms lasted

Questions to ask your doctor

  • When can I go back to school, work or sport?
  • What if the tiredness does not go away?
  • Do I need any follow-up tests?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Difficulty breathing or swallowing, or sudden sharp pain in the left side of the tummy: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources

Related conditions

TonsillitisInfection of the tonsils at the back of the throat, usually caused by a virus. It is common in children and usually gets better in a week.ME/CFSA long-term condition causing extreme tiredness that does not improve with rest and gets worse after activity. Support helps people manage it.