fatigue syndrome, sometimes called CFS, is a condition that makes you feel so
tired that you can't do all of your normal, daily activities. There are other
symptoms too, but being very tired for at least 6 months is the main
Many people improve in a year or two and do not have a
relapse. Some people continue to have severe fatigue and other symptoms for
The disease is not well understood. Most experts now
believe that it is a separate illness with its own set of symptoms. But some
doctors do not believe this.
There are no tests for CFS. Because
of this, many people have trouble accepting their disease or getting their
friends and family to do so. Having people who believe your diagnosis and
support you is very important. Having a doctor you can trust is critical.
Your tiredness is real. It's not "in your head." It is your
body's reaction to a combination of emotional and physical factors.
Doctors don't know what causes
CFS. Sometimes it begins after an illness like the flu, but there is no proof
of any connection. It's likely that a number of factors or triggers come
together to cause CFS.
Extreme tiredness, or
fatigue, is the main symptom. If you have CFS:
- You may feel exhausted all or much of the
- You may have problems sleeping, or you may wake up feeling
tired or not rested.
- It may be harder for you to think clearly, to
concentrate, and to remember things.
- You may also have headaches,
muscle and joint pain, a sore throat, and tender glands in your neck or
- Your symptoms may flare up after a mental or physical
activity that used to be no problem for you.
Depression is common with CFS, and it can make your other
symptoms worse. Antidepressant medicines can help you feel better.
There are no tests for CFS.
Doctors can diagnose it only by ruling out other possible causes of your
fatigue. Many other health problems can cause fatigue, and most people with
fatigue have something other than chronic fatigue syndrome.