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Lethargy is more than just feeling tired. People who have to wake up extra early to catch a flight or get home from work late after a grueling day often feel tired. Lethargy, however, is often prolonged and affects not only energy levels but also motivation and the ability to concentrate. Often, lethargy is a symptom of a larger issue or illness.

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1. What Is Lethargy?

Lethargy is a state of reduced awareness and alertness paired with extreme tiredness. While lethargy is usually relatively mild, it can last for a prolonged period and can be disruptive to a person's quality of life. Lethargy usually has a treatable underlying cause. The first step in treatment is to identify this cause.

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