There's no test for chronic fatigue syndrome (CFS), but there are clear guidelines to help doctors diagnose thecondition.
It can take a long time for CFS to be diagnosed, as other conditions that cause similar symptoms need to be ruled out first.
You may be given some advice about managing your symptoms before a diagnosis is confirmed. See treating CFS for more information.
If you see your GP about persistent and excessive fatigue, they'll ask you about your medical history and may carry out a physical examination.
You may have Blood tests ,urine testsand scans to rule out other conditions, such as anaemia (lack of red blood cells), an underactive thyroid gland , or liver and kidney problems.
Guidelines released in 2007 from the National Institute for Health and Care Excellence (NICE) statedoctors should considerdiagnosing CFS if a person has fatigue and all of the following apply:
Theperson should alsohave one or more of these symptoms:
This diagnosis should be confirmedby a clinicianafter other conditions have been ruled out. The symptoms listed above must have persisted for at least four months in an adult and three months in a child or young person.
For more information, read the NICE guidelines on CFS .
It's likely some people diagnosed with chronic fatigue syndrome actually have postural tachycardia syndrome (PoTS).
PoTS is an abnormal increase in heart rate after sitting or standing up, which typically causes dizziness, fainting, sweating and other symptoms.
Chronic fatigue syndrome (CFS) causes persistent fatigue (exhaustion) that affects everyday life and doesn't go away with sleep or rest.
The symptoms of chronic fatigue syndrome (CFS) vary from person to person. There are often periods when they are better or worse.
Exactly what causes chronic fatigue syndrome (CFS) is unknown, but there are several theories.