Many reasons: Fatigue is a very non-specific symptom (= has many different causes). Interaction of oxynorm w med (eg Anxicalm, diazepam), change in mood, poor quality sleep (anxiety, snoring/sleep apnea ,noise or changed sleeping habits, etc), high stress, infection (eg a passing virus), thyroid problems, anemia, liver/kidney problems, worsening of pain...list goes on. Worthwhile getting seen for it.
Answered 1/29/2015
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