WEBMD - Why Am I So Tired? 10 Causes of Fatigue and Fatigue Treatment Tips, Mar 13, 2012

 "This morning, you promised yourself that you'd head straight to the gym right after work. But by the end of the day, you were so beat that all you could think about is collapsing on the couch with takeout and the remote.
Why are you so tired all the time? Are you just not getting enough sleep, or could something be medically wrong?
Chronic tiredness is one of the most common complaints that bring people to their doctor, says J. Fred Ralston Jr., MD, an internist practicing in western Tennessee and a past president of the American College of Physicians.
"People put it all kinds of different ways: Some say they're tired, some say they're fatigued, some say they just aren't able to do what they need to do," Ralston says.
If you're constantly plagued by exhaustion, there are a host of medical issues that could be wrong, and we'll talk about those later. You may also wonder if you're doing too much. But the most likely answer is just the opposite: You're not doing enough."
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