By Hattie Gladwell for Metro.co.uk.
Chronic fatigue syndrome (CFS) causes persistent fatigue that affects everyday life and doesn’t go away with sleep or rest.
CFS is also known as ME, which stands for myalgic encephalomyelitis.
CFS is a serious condition that can cause long-term illness and disability, but many people – particularly children and young people – improve over time.
It’s not known exactly what causes CFS, but various theories have been suggested, including viral or bacterial infections, problems with the immune system, an imbalance of hormons and psychiatric problems.
But, whatever the cause, CFS is an extremely debilitating illness in many ways, and it completely sucks.
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