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A member asked:
What causes excessive yawning? my son yawns entirely too much.
A doctor has provided 1 answer
Fatigue & other: Yawning is a normal response to fatigue and drowsiness, but excessive yawning can be caused by a vasovagal reaction. This reaction is caused by the action of a nerve, called the vagus nerve, on the blood vessels. It may indicate a heart problem, or a disorder associated with excessive daytime sleepiness. Consult physician to rule out heart problem.
Answered 11/12/2016
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