Many possibilities: You might be tired b/c your pulse is too high (>100bpm). Or you might be tired b/c you're sick, or anemic, or have an under active thyroid (hypothyroidism). Lots of other causes of feeling tired, like heart/kidney/liver failure, depression, etc. The list goes on. Oh yeah, stress, lack of quality sleep (not just quantity). Best to go see your family doc for an evaluation & appropriate treatment.
Answered 3/23/2013
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