Chronic Fatigue Syndrome/ Myalgic Encephalomyelitis (CFS/ME) may also be known as Post Viral Fatigue syndrome, Chronic Fatigue Immune Dysfunction syndrome.

CFS/ME is a complex illness involving extreme fatigue over a long time. Extreme exhaustion is nearly always a prominent part of CFS, plus muscle pain and flu-like malaise. Problems with concentration and memory, loss of balance, digestive problems, sleep disturbances and mood swings may also be experienced.