According to Wikipedia ….. “Fatigue (also called exhaustion, tiredness, languidness, languor, lassitude, and listlessness) is a subjective feeling of tiredness which is distinct from weakness, and has a gradual onset. Unlike weakness, fatigue can be alleviated by periods of rest. Fatigue can have physical or mental causes.” more
Fatigue can affect your health, your job performance, your relationships ….. basically your quality of life. Below is a great link that will help you learn about the causes of fatigue and how to fight it.