Fatigue is often confused with tiredness. Usually, you know why you are tired and a good night's sleep solves the problem.
Fatigue can prevent a person from functioning normally and impacts a person's quality of life.
It is not predictable by tumor type, treatment or stage of illness. Usually, it comes on suddenly, does not result from activity or exertion, and is not relieved by rest or sleep. It may continue even after treatment is complete. The exact reason for CRF is unknown. CRF may be related to the disease process or its treatments.