Slow or fast reaction time can have various causes, ranging in severity from 'worrying' 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 or fast reaction time, we could:
How quick would you say is your reaction time / reflex? An example would be how fast your foot hits the brake when you see the car in front brake.
Possible responses:→ Very slow/poor
→ Average / don't know
→ Very fast/good
Slowed reflexes are a sign of hypothyroidism.