The fatigue is the medical term that refers the tiredness in the body. It also refers the central nervous system illness. It is an awareness state. It contains both the physical and the mental. The physical fatigue is the one that you cannot able to continue the functions after certain time. It will occur mostly when you are doing heavy exercises. This type of fatigue is depends on the physical fitness of the body.
The mental fatigue is the one related with the sleepiness disorder. The fatigue is mainly caused by the mental stress, depression, over stimulation and lack of sleep. The fatigue will also cause some diseases like cancer, heart disease, blood disorders and diabetes. The relaxation is the best treatment for this disease. You have to do the exercise regularly to cure this fatigue.