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What is the cause of excessive yawning?

In: Health, Conditions and Diseases, Yawning [Edit categories]

Answer:

Excessive yawning can be caused by a vasovagal reaction. A vasovagal reaction is caused by the action of a nerve on the blood vessels. This nerve is called the vagus nerve. It may indicate a heart problem.

First answer by Superron. Last edit by Answers Publishing Network. Contributor trust: 102 [recommend contributor ]. Question popularity: 1 [recommend question].

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