Frequent yawning can have various causes, ranging in severity from 'minor' to 'critical'. 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 frequent yawning, we could:
Roughly how often do you yawn, on average?
Possible responses:→ Never / a few times per year perhaps
→ I'd say less than average
→ Average / a few times per day / don't know
→ Many times during the day
→ Several times every hour
Excessive yawning can be caused by a vasovagal reaction and may indicate a heart problem.
It has been observed that schizophrenic patients tend not to yawn often and, conversely, that persons who yawn a lot tend not to have schizophrenia.