Slow recovery from colds and flu can have various causes, ranging in severity from 'needs attention' to 'very 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 slow recovery from colds and flu, we could:
|Weakened Immune System
Compared to other people, how quickly do you tend to recover from a cold or flu? Normally symptoms are at their worst in the first 2-3 days, then start improving during days 3-5, with full recovery taking 7-14 days.
Possible responses:→ Don't know
→ Quickly - full recovery usually within 1 to 5 days
→ I'm about average
→ Colds/flus often hit me harder than other people
→ Recovery usually/always takes over 2 weeks