Fatigue has two meanings, namely physical fatigue and psychological fatigue.
Psychological fatigue is manifested through physical fatigue, and it is
not truly physical fatigue, so it is often overlooked by us. Psychological
fatigue is caused by long-term mental overload. Its manifestation is
generally 'always in a state of thinking, reflecting emotions such as
anxiety, boredom, fear, depression, similar to' heart failure '.