02/07/2012 05:11 pm ET Updated Apr 08, 2012

Surprising Reasons You're Tired All The Time

We all tend to blame fatigue on a too-busy lifestyle. And much of the time we're right.

If you feel tired all the time, don't blow it off. Give yourself about two to three weeks to make some lifestyle changes. Get more sleep, trim your social calendar, eat more wholesome foods, drink more fluids, take a multivitamin and cut back on caffeine and alcohol.

"If you're still feeling the symptoms of fatigue after those changes, then you need professional help," says Sandra Adamson Fryhofer, M.D., an internal medicine doctor in Atlanta. Excess exhaustion could be the sign of a more serious medical condition that can  be treated. Here are the seven most common problems to know about.

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