My cat vomited and then fainted. What's wrong? Is he in danger?

Question

My 5yo cat Larz vomited and then fainted. His eyes were dilated and he was out of it for a few seconds. He then seemed fine and has been ok since it happened about 45 mins ago. What could be the problem? Is he in immediate danger? Pet's info: Cat | Domestic Shorthair | Male | neutered | 5 years and 5 months old | 13.5 lbs

Dr. Melanie, BVSc MS · Accepted Answer

It could be Larz vomited so hard that he passed out. Certain stimuli (such as vomiting like Larz did) affect the vagus nerve which has receptors in many areas of the body including the esophagus and stomach. This, in turn, causes an overload to a part of the nervous system leading to a rapid drop in the heart rate and blood pressure resulting in fainting. I'd keep a close eye on him, and if he vomits again, have him seen by a vet.

My cat vomited and then fainted. What's wrong? Is he in danger?

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