The main symptom of
chronic fatigue syndrome (CFS) is a devastating
tiredness or exhaustion that has lasted at least 6 months and does not improve
much with rest. This fatigue also is so severe that it interferes with your
work, your play, and your social activities. The fatigue and other symptoms
described below may begin suddenly or they may develop gradually over weeks or
It is possible that the main title of the report Chronic Fatigue Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
that are different from other headaches you have had in the
Unrefreshing sleep (waking up feeling tired or not rested).
Feeling unwell after exercise or other physical activities.
Because CFS is not easily diagnosed, health experts have
established some rules to help them recognize the disease. To be diagnosed with
CFS, you must have fatigue and at least four of the symptoms listed above. At
least four of your symptoms must have started at the same time as or after your
fatigue began, and they must have lasted for at least 6 months.
But if you have symptoms of CFS, such as often feeling very tired for no clear reason, you may still get treatment even if you don't quite meet these criteria. For instance, your doctor may decide you need treatment even if you have had symptoms for less than 6 months.
Some people with CFS develop a
condition in which their heart rate increases and their blood pressure drops
when they stand or sit up from a reclining position. This is often described as
feeling "lightheaded" or feeling faint or dizzy. This condition is called
causes symptoms that are the same as many other diseases, especially early on.
For this reason, it can be diagnosed only after a thorough evaluation has ruled
out other conditions with similar symptoms.
WebMD Medical Reference from Healthwise
January 18, 2013
This information is not intended to replace the advice of a doctor.
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