Voice changes can have various causes, ranging in severity from 'serious' to 'generally fatal'. 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 voice changes, we could:
Within the past few years, months or weeks, has your voice changed in any way, for no apparent reason?
Possible responses:→ No / don't know
→ A little, I think
→ Moderately - I have had a few comments about it
→ Significantly - Many have noticed it
→ Yes, it has changed almost beyond recognition
The patient's voice may change because the vocal chords are affected.