What causes fainting when swallowing food?

Fainting when swallowing food, known as swallowing-induced syncope, can be caused by a vagal response, where stimulation of the vagus nerve during swallowing leads to a drop in heart rate and blood pressure. This can result in reduced blood flow to the brain, causing fainting. Other potential causes include esophageal disorders, such as strictures or spasms, or cardiovascular issues that may be exacerbated by the act of swallowing. If this occurs frequently, it is advisable to seek medical evaluation.