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Glandular fever
Infectious mononucleosis (glandular fever) is caused by the Epstein-Barr virus. Infection is quite common during childhood and adolescence, and usually lasts 1 to 2 weeks
Recovery can take up to 6 weeks, particularly for the fatigue/tiredness symptoms, but it is recognised that the tiredness/fatigue can last up to 6 months after the infection in some people, or that chronic fatigue syndrome can develop 
Glandular Fever has a lot of symptoms, some of which may be present 4 to 6 weeks before the virus can be diagnosed with a blood test:
- high temperature (above 39 degrees C / 102 degrees F)
- sore throat
- tiredness/fatigue
- loss of appetite and weight loss
- swollen glands, usually in the neck
- headache
- muscle pains
- sometimes an enlarged tender spleen
- sometimes a fine red rash
Because Glandular Fever is caused by a virus there is no specific treatment, but the following is good advice:
- take paracetamol or ibuprofen for the pain and fever
- keep hydrated by drinking plenty of fluids
- get plenty of rest, and avoid strenuous exercise until you feel the fatigue symptoms have gone
- because the immune system (and specifically the liver and spleen) are affected avoid alcohol for 8 weeks afterwards
- because the spleen can become enlarged (which makes it vulnerable to damage) you should avoid contact sports such as rugby, martial arts, etc for 8 weeks afterwards
- to help prevent the virus spreading observe common sense precautions such as avoid kissing and close body contact with other people whilst you are ill. Don't share cups, towels, etc
Source: LSMP
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