Fatigue refers to extreme exhaustion, which is normally caused by mental or physical stress or illnesses and diseases. Fatigue has also been linked to disorders, such as major depression, and parasite infections, such as pregnancy, pinworm, and tapeworm.
Fatigue is often classified into two categories: mental and physical fatigue. Physical fatigue refers to a person’s decreased mobile ability. In contrast, mental fatigue refers to a person’s decreased state of mental awareness; a person will often feel sleepy throughout the day and may have difficulty concentrating.
Common names for fatigue include tiredness, lethargy, and listlessness, which are all used to describe a state of extreme exhaustion and weakness in muscles. Due to a mind-body connection, people who are physically exhausted for an extraneous amount of time may also become mentally exhausted.
The most common signs of fatigue include: headache, dizziness, drowsiness, extreme sleepiness (often leading to involuntary onsets of sleep) and physical aches and pains.
Common causes of physical fatigue is often caused by a sport-related or physically active related activity, over-exertion of the human body, and age. Most age-related cases of physical fatigue involve mobility difficulty, such as finding it difficult to climb stairs, travel, or engage in physical activities.
Psychological fatigue could be cause for a wide variety of reasons, such as insomnia, restlessness at night, inadequate amounts of sleep (each night), major depression, drug/alcohol abuse, physical fatigue, physical/mental illness.
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