Fatigue is one symptom of Hepatitis C infection, but treatments for Hepatitis C can also cause fatigue. Ribavirin and interferon can cause anemia and affect thyroid function.

Weakness and fatigue refer to two different things; Read about the difference in causes and symptoms between fatigue and weakness.

Too tired to read? This brief overview of fatigue, including causes of fatigue, will provide the information you need, without too much effort.

Anemia can cause fatigue, but not all fatigue is caused by anemia. Anemia diminishes the oxygen supply to your heart and other vital organs and drains you of energy. Learn more here.

Along with feelings of sadness and hopelessness, fatigue is one of the classic symptoms of depression. If you're feeling fatigued, make sure to rule out depression as a cause.

As discussed on Oprah, unexplained fatigue and weight gain may be caused by thyroid problems. Get answers to FAQ about the thyroid, thyroid disorders and treatments.

Fatigue in women can be caused by many factors. Use the handy flowchart to determine whether your fatigue needs medical treatment.

Fatigue which worsens as the day progresses may be caused by heart disease. Read more about fatigue as well as other symptoms of heart disease.

Don't know why you're so tired? Oprah magazine discusses some of the most overlooked causes of fatigue, including low thyroid, anemia, Hepatitis C and heart disease.

This article provides a long list of possible causes of fatigue, including some medications that can cause tiredness. Great checklist for determining why you're feeling run-down.