Feb 12, 2018
The official name of your gag reflex is the pharyngeal reflex or laryngeal spasm. Trigger points for the gag reflex can be found on the roof of the mouth, back of the tongue, in the tonsil area, the uvula, and the back of the throat. The purpose of this reflex is to prevent objects from entering the throat that did not first progress through the normal swallowing process. It also helps prevent choking.
When the reflex is triggered, the soft palate raises to close off the nasal passage. Then the pharyngeal muscles contract on both sides to try and force whatever made it too far down back up into the mouth. If the input is strong enough, it can also trigger vomiting (this is how vomiting is induced in eating disorders such a bulimia).
One in three people lacks a gag reflex, which means rather large things can enter their throats without triggering a reflex. This is possibly how sword-swallowing got its start.
The other side of this coin is someone with a hypersensitive gag. They can have trouble swallowing large pills and large bites of food. Dentist visits and even neckties can trigger this unpleasant reflex. It can be a part of a larger issue, such as Sensory Processing Disorder or Autism. Or it can be a preconditioned issue due to a previous experience. In either case, speech or occupational therapy can be done and will include desensitizing areas of the mouth to touch.
All of these reflexes are protective to prevent choking or improper ingesting of things. They can be damaged to different degrees during head trauma or stroke. But surprisingly, smoking causes the most damage to the protective reflexes on the pharynx.
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