The woman, 25, was seen in hospital complaining of short 10-second episodes of feeling "light-headed, occasionally nauseous, and suddenly and alarmingly unwell".

On more than one occasion she had collapsed. The problem had started when she was aged 15, sometimes recurring several times a week. [...] The episodes tended to occur when the woman consumed certain types of food, particularly sandwiches and fizzy drinks.

Turns out, her condition is called "swallow syncope," a rare medical condition where swallowing triggers the nerve reflexes that cause the heart to stop temporarily: Link – via Look At This