Exhaustion can have various causes, ranging in severity from 'troubling' to 'serious'. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose exhaustion, we could:
Are you currently experiencing fatigue or exhaustion that started suddenly less than 3 months ago? Do not include fatigue that is due to an obvious cause, such as pregnancy.
Possible responses:→ Don't know
→ No / not sudden onset / started over 3 months ago
→ Yes, it started about 1-3 months ago
→ Yes, it started about 1-4 weeks ago
→ Yes, it started within the past week
The rapid onset of (ascending) weakness, frequently accompanied by abnormal sensations that affect both sides of the body similarly, is a common presenting picture.
Intermittent and moderate fatigue is one of the early and main symptoms of mononucleosis. It almost always disappears within 2-4 weeks and lasts for months in only 1-2% of cases. Prospective studies among University populations have established that 20% of patients returned to work or school within 1 week and 50% within 2 weeks.