For about a decade, a 63-year-old man in Japan had spells of dimming vision, and sometimes full blackouts, right after drinking beer. When cardiologists finally tested him drink by drink under continuous monitoring, the trigger turned out to be remarkably specific: only beer taken straight from the refrigerator stalled the electrical signals in his heart, including one pause that lasted 7.9 seconds.
Cold soda didn't do it. Neither did cold sake or beer left at room temperature. Physicians at Saiseikai Izuo Hospital in Osaka described the case in American Heart Journal Plus: Cardiology Research and Practice, where it was published online June 29. The authors called the trigger extraordinarily specific, and the man's treatment ended with a permanent pacemaker.
Ten Years of Fainting After a Beer
The episodes began about 10 years earlier and at first came roughly once a year, according to the report. In the year before he sought care, they were happening monthly. Each followed the same pattern: a choking sensation in his throat immediately after drinking beer, followed by dimming vision or a faint.
He was admitted to the hospital after a witnessed fainting episode that injured his face. Nearly every standard test for unexplained fainting came back normal. His heart ultrasound, CT scans, tilt-table test, treadmill test, heart catheterization, and coronary angiography showed no structural or blood-flow problem, and a test for coronary artery spasm was negative. A barium swallow found no abnormality in his esophagus, and several days of in-hospital heart monitoring caught no arrhythmia.
The team suspected swallow syncope, also called deglutition syncope, a rare reflex in which swallowing overstimulates the vagus nerve and briefly slows or blocks the heartbeat. A 2019 review in BMC Cardiovascular Disorders analyzed 101 published case reports dating back to 1793, a small number for more than two centuries of medicine.
The Drink-by-Drink Test That Found the Culprit
Under continuous monitoring, the man ate ordinary meals and tried hot coffee, effervescent agents, carbonated soda chilled to 4 degrees Celsius (about 39 degrees Fahrenheit), sake chilled to the same temperature, and beer at room temperature, about 24 degrees Celsius (75 degrees Fahrenheit). None reproduced his symptoms or blocked his heart's electrical conduction.
Beer taken straight from a 4-degree refrigerator did, and it did so repeatedly. It caused transient atrioventricular block, a stall in the electrical signal traveling from the heart's upper chambers to its lower chambers. During an electrophysiology study, with catheters recording signals from inside the heart, one episode lasted about 4 seconds, and his blood pressure dropped along with it. The recordings placed the block at the level of the atrioventricular node, which the authors said strongly supported a nerve-driven reflex rather than disease in the heart's wiring.
Outside the lab, an ambulatory heart monitor caught the most striking event: a symptomatic 7.9-second pause caused by high-grade block, occurring only after ice-cold beer.
The pattern is what makes the case so puzzling. Chilled soda is cold and fizzy. Chilled sake is cold and alcoholic. Room-temperature beer is still beer. The authors concluded that temperature alone was not enough and suggested that other features of beer, possibly its alcohol content or the way it interacts with stimulation of the esophagus, may have contributed. They did not identify a definitive mechanism. Alcohol has been tied to heart block in rare reports, including a 2023 case in a healthy young man that the authors cited.
A Pacemaker After Medication Failed
Doctors first tried disopyramide, a heart rhythm drug with anticholinergic properties. It didn't work. When the man drank ice-cold beer during treatment, the high-grade block came right back.
Because his fainting had already caused an injury and his slow heart rhythms were documented, the team implanted a permanent pacemaker. The follow-up test is the most telling part of the report. Ice-cold beer still triggered the block, but the pacemaker kicked in, and he had no symptoms at all. The device didn't stop the reflex. It caught the heart when the reflex struck.
The authors noted an alternative, cardioneuroablation, a catheter procedure that targets nerve clusters around the heart and has been reported to work in some swallow syncope cases. They chose the pacemaker because it offered established, immediate reliability for a patient who had already been hurt.
That decision contrasts with a case MedicalDaily recently covered, in which a man's heart stopped for about 17 seconds after a Slurpee. His doctors did not implant a pacemaker because his trigger was clear and avoidable, and he was told to avoid icy drinks.
A Rare Reflex, Not a Reason to Fear Cold Drinks
This is a single patient, and swallow syncope remains rare. Nothing in the report suggests that cold beer poses a danger to the general public. Cold drinks have been implicated before, including in a 2012 Korean report of a 39-year-old man whose fainting was linked to cold carbonated beverages. A trigger limited to ice-cold beer alone, however, appears exceptionally narrow.
The broader lesson the authors draw is about detective work. Standard fainting tests found nothing in this man. What cracked the case was careful history-taking, followed by testing the exact drink under the exact conditions that set off his symptoms.
Anyone who faints, nearly faints, or feels a choking sensation followed by dizziness while eating or drinking should describe those details to a clinician, since timing and triggers can be key diagnostic clues.
Key Questions Answered
What happened to the man in this case?
A 63-year-old man in Japan had about a decade of fainting episodes after drinking beer. Testing showed that only ice-cold beer caused a temporary electrical block in his heart, including one 7.9-second pause.
What is swallow syncope?
It is a rare reflex condition in which swallowing overstimulates the vagus nerve, slowing or temporarily blocking the heartbeat and reducing blood flow to the brain, which can cause fainting.
Why didn't cold soda or cold sake cause the same reaction?
No one knows for certain. The authors said temperature alone was not enough and suggested that alcohol content or how beer interacts with stimulation of the esophagus may play a role, but the mechanism was not proven.
Did the pacemaker cure the condition?
No. Ice-cold beer still triggered the heart block afterward, but the pacemaker took over immediately, and the patient had no symptoms.
Should people worry about drinking cold beverages?
There is no evidence of a general risk. Swallow syncope is rare, and this report describes a single patient with an unusually specific trigger.
What should someone do if they faint while eating or drinking?
They should seek medical evaluation and describe exactly what they were eating or drinking, its temperature, and any throat sensations beforehand, since those details can guide testing.
