Lethargy

Lethargy is a state of tiredness, weariness, fatigue, or lack of energy. It can be accompanied by depression, decreased motivation, or apathy. Lethargy can be a normal response to inadequate sleep, overexertion, overworking, stress, lack of exercise, or boredom. It can also be a symptom of a variety of physical and mental illnesses or a side effect of some medications.

Causes

Lethargy can be caused by a variety of conditions including:

• Chronic fatigue syndrome: A complex disorder characterized by extreme fatigue that can't be explained by any underlying medical condition.
• Anemia: A condition in which you lack enough healthy red blood cells to carry adequate oxygen to your body's tissues.
• Underactive thyroid (hypothyroidism): A condition in which your thyroid gland doesn't produce enough of certain crucial hormones.
• Sleep apnea: A serious sleep disorder in which breathing repeatedly stops and starts.
• Heart disease: A range of conditions that affect your heart.
• Diabetes: A group of diseases that result in too much sugar in the blood.
• Depression: A mood disorder that causes a persistent feeling of sadness and loss of interest.

Treatment

Treatment for lethargy involves treating the underlying cause. This may involve medication, changes in diet or exercise habits, therapy for mental health conditions, or management of chronic conditions.

See also

• Fatigue (medical)
• Malaise
• Drowsiness
• Somnolence

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