Feeling tired all the time but unsure what's causing your fatigue? Discuss with your doctor these seven factors that could be at the root of your exhaustion, recommends WebMD.com:
1) Anemia
2) Underactive thyroid
3) Undiagnosed urinary tract infection
4) Too much caffeine
5) Food allergies
6) Sleep apnea
7) Undiagnosed heart disease
