CFS/Chronic fatigue syndrome is a complicated disorder characterized by extreme fatigue that can't be explained by any underlying medical condition. The fatigue may worsen with physical or mental activity, but doesn't improve with rest. It resembles arthritis due to excessive pains but it is not arthritis..
Sleep plays an important role in CFS. People with CFS tend to wake up feeling tired despite sleeping enough. This morning fatigue is because of a sleep disorder where a person is unable to go into a deep sleep. Their deep sleep is interrupted by bursts of activity in the brain similar to wakefulness. So people suffering from CFS are deprived from this restorative phase of sleep.
Malaise after exertion;
Widespread muscle and joint pain
Headaches of a type not previously experienced,
Chronic and severe mental and physical exhaustion
Additional symptoms may be reported, including
Increased sensitivity to light,
Sounds and smells,
Problems standing upright
Painful and often slightly swollen lymph nodes,
Cardiac and respiratory problems.