Chronic Fatigue Syndrome (CFS) generally refers to a disorder in which there is severe and persistent tiredness, which is not relieved by rest. As the name suggests, it is a state of chronic fatigue that exists without any cause for more than six months and is accompanied by difficulties in short-term memory and/or concentration.

Chronic fatigue syndrome affects approximately ten people among thousands of people.

This condition occurs most commonly in young to middle-aged adults. It occurs more commonly in females than in males.

Though the exact cause of chronic fatigue syndrome (CFS) is unidentified some theories suggest CFS may be due to some viral infection or due to the altered immune system.

Generally, the symptoms of CFS are similar to those of the flu and other common viral infections, which include

There are no specific laboratory tests for the diagnosis of CFS, The clinical finding and symptomatology often help to diagnose and exclude the possibilities of other diseases.