No. Your heart keeps right on beating, even through the worst sneezing fit you can imagine.
Coughing, sneezing, bearing down, and other activities can change the pressure inside the chest and the blood flow back to the heart from the veins. It’s theoretically possible that sneezing could change blood flow enough to cause the heart to delay a beat for a fraction of a second. These kinds of variations in heart rate are normal and occur in all healthy people.
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