Why do we say “bless you” when someone sneezes?
Nobody knows for sure. The custom is at least 2,000 years old: the Roman writer Pliny the Elder was already asking why people saluted a sneeze around 77 CE.
Quick Answer
Nobody knows for certain, but the habit is ancient. In his Natural History, written around 77 CE, the Roman author Pliny the Elder asked why people salute someone who sneezes, which suggests the custom was already old and its reason forgotten. The most famous story says Pope Gregory I urged people to say “God bless you” during a plague that hit Rome in 590 CE, when a sneeze could be an early sign of illness, but historians have found little solid evidence that he issued any such order. Another old belief held that a sneeze could expel the soul unless someone offered a blessing. Other languages wish you good health instead: German speakers say “Gesundheit,” and Spanish speakers say “salud.” And no, your heart doesn’t stop when you sneeze, though the pressure change in your chest can briefly alter its rhythm.
By the Numbers
Key Facts
- Short answer
- No one knows for sure. The custom is at least 2,000 years old
- Earliest record
- Pliny the Elder asked about it around 77 CE
- Famous story
- Pope Gregory I during a plague in 590 CE, though evidence is thin
- Other languages
- “Gesundheit” in German and “salud” in Spanish wish you good health
Older than anyone remembers
Around 77 CE, the Roman writer Pliny the Elder asked in his Natural History why people salute someone who sneezes. If a Roman scholar already didn’t know the reason, the custom was old even then.
The plague story
The most repeated origin story says that during a plague in Rome in 590 CE, Pope Gregory I urged people to bless anyone who sneezed, since sneezing could be an early sign of illness. It’s a good story, but historians have found little evidence for it, and the custom is centuries older.
Souls and spirits
Another explanation comes from an ancient belief that the soul was a kind of air living in the head. A hard sneeze might blow it out, so a blessing was a way to keep it safe.
Does your heart stop?
No. According to the Library of Congress, the pressure change in your chest during a sneeze can alter your heart’s rhythm for a moment. The next beat can feel stronger, which may explain the sensation of a skipped beat.
Myth vs. Fact
MythYour heart stops when you sneeze.
FactIt doesn’t. Pressure changes in your chest can briefly alter its rhythm, which may feel like a skipped beat.
MythPope Gregory invented “bless you.”
FactThe custom is centuries older. Pliny the Elder asked about it around 77 CE.
The Bottom Line
We say “bless you” out of a habit so old that even the Romans didn’t know where it came from. Whether it began as a prayer against plague or protection for the soul, it has survived as simple politeness.