Alcohol intolerance can have various causes, ranging in severity from 'very minor' to 'needs attention'. 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 alcohol intolerance, we could:
What is your alcohol tolerance?
Possible responses:→ Very easily intoxicated (a couple of sips does it)
→ I am easily intoxicated
→ Average / I don't drink / don't know
→ I am quite tolerant
→ Very tolerant (I can drink all night)