It is normal to feel lack of energy, tired, or drowsy at times. A person may even act sluggish, listless, or uninterested. When lethargy lasts more than a day or two, it may be a sign of a more serious problem. Depression is the most common cause of lethargy. Other symptoms may include:
* Feeling tired when waking in the morning.
* Simple tasks seem too tough to handle.
* Concentrating is difficult.
* Multiple aches and pains may occur.
* Appetite and bowel patterns change.
* Difficulty falling or staying asleep.

It is not a good idea to try and treat the problem with caffeine, drugs or vitamins. If it continues, seek medical care. Other causes of lethargy include:
* Head injury.
* Overdose of drugs or alcohol.
* Widespread infections to the body or bloodstream.
* Diseases such as diabetes, measles, mononucleosis, encephalitis, and Reye's Syndrome.
* High or low blood pressure.
* Poor nutrition, especially in babies and young children.
* Thyroid or adrenal gland disorders.

In cases of serious injury, infection, or disease, lethargy can worsen into a daze, or even unconsciousness. Be sure the lethargic person can answer basic questions such as date, where they are, and commonly known facts. If not, get immediate medical attention. Call 911 if the person passes out.

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