Focal brain stem lesions have already been found to cause pathological yawning.
Jurko and Andy12 reported excessive yawning during hyperventilation in patients who had previously undergone thalamotomy or with recent head trauma, and concluded that it can be a sign of brain stem damage.
What is excessive yawning a sign of?
Researchers aren’t exactly sure why yawning occurs, but common triggers include fatigue and boredom. Although excessive yawning is usually attributed to being sleepy or bored, it may be a symptom of an underlying medical problem. Certain conditions can cause a vasovagal reaction, which results in excessive yawning.
What part of your brain controls yawning?
A part of the brain that plays an important role in yawning is the hypothalamus.
Is yawning a sign of lack of oxygen to the brain?
Some evidence suggests that yawning is a means of communicating changing environmental or internal body conditions to others. Still, low oxygen levels in the paraventricular nucleus (PVN) of the hypothalamus of the brain can induce yawning. Another hypothesis is that we yawn because we are tired or bored.
Is yawning a symptom of stroke?
Pathological yawning can be a clinical sign in disorders affecting the brainstem. Here we describe seven patients with pathological yawning caused by acute middle cerebral artery stroke, indicating that pathological yawning also occurs in supratentorial stroke.