Although this treatment is often effective, it can cause hair loss and fatigue.

Many of the things that cause fatigue can be treated, and you may feel better.

Some of the medications you may take can cause fatigue, too.

The disease may also cause fatigue and pain in the joints.

People who sleep longer may have illnesses that cause fatigue and earlier death.

And research indicates too much actually causes fatigue in some people.

Daily activities can cause fatigue, so you've got to adapt.

This is fatigue caused by moving through different time zones.

In addition to insomnia, many other health problems can cause fatigue.

However, the understanding of what causes fatigue is still relatively limited.