Why do we say “bless you” after someone sneezes?

A sneeze used to mean more than a sneeze

A sneeze is an involuntary reflex: irritation in the nose sends signals to the brain, which coordinates a rapid expulsion of air. Modern people generally understand it as a bodily response to dust, pollen, pepper, infection or another irritant. Earlier societies did not have that explanation, so a sudden, noisy burst of breath could seem mysterious or significant.

The Library of Congress records several different historical interpretations. Some ancient traditions treated a sneeze as a favourable sign, while others regarded it as an omen or a moment when a person needed protection. A sneeze could therefore invite a spoken response even when the person was not obviously ill. The words were not necessarily meant to explain the sneeze; they were a way of answering an unexpected event.

The famous plague-and-pope story

The explanation most often repeated in English is set in Rome during a plague traditionally dated to 590 CE. According to the story, Pope Gregory I encouraged people to say “God bless you” after a sneeze because sneezing could be an early sign of serious disease, and the blessing was intended to protect the person from death.

It is an appealing story because it connects three things people readily associate with the custom: disease, religion and fear. However, the evidence is not strong enough to treat it as a settled origin. The Library of Congress describes the account as one of several beliefs about the phrase, rather than as a proven historical fact. The older medical discussion in JAMA likewise presents the plague explanation as part of a wider field of folklore surrounding the sneeze.

That distinction matters. A story can be culturally influential without being historically demonstrable. The plague story may have helped explain or reinforce an existing response, but the available evidence does not show conclusively that Gregory created the custom in 590 CE.

Did people really think a sneeze could expel the soul?

Another popular explanation says that ancient people believed the soul was made of breath or air, and that a sneeze might force it out of the body. A blessing would then act as spiritual protection. Related versions say that sneezing opened the body to evil spirits, or expelled a harmful spirit that might enter someone else.

These ideas belong to folklore rather than established medical knowledge. They are useful for understanding why a sneeze could attract a protective phrase, but they should not be presented as one universally held ancient belief. The sources describe several competing interpretations, not a single belief shared by all cultures or periods.

The body itself may have encouraged such speculation. Sneezing involves a deep breath, a sudden increase in pressure, the closing of the eyes and a forceful release of air. To observers without modern anatomy, it could look like a brief interruption in ordinary life. A spoken blessing made emotional sense even if no one could agree exactly what the sneeze signified.

Why not say something after a cough?

Sneezing became especially associated with ritual responses because it is abrupt, conspicuous and difficult to ignore. It also has a distinctive sound and a visible physical action. JAMA’s discussion notes that people traditionally responded to sneezing with benevolent expressions, even though other bodily events such as coughing, hiccupping or vomiting did not receive the same routine greeting.

There may also be a practical reason. A sneeze can be a sign that someone is becoming unwell, so a wish for blessing or good health is socially understandable. In that sense, “bless you” combines concern with ceremony. It acknowledges that something has happened to another person without requiring a conversation about symptoms.

The custom also became self-reinforcing. Children learn that a sneeze is followed by “bless you”, and adults repeat it automatically. Once a response becomes ordinary etiquette, people can continue using it after the original explanation has faded. The same process has allowed many greetings, farewells and table manners to outlive the beliefs that first surrounded them.

“Gesundheit” offers a different answer

Not every language uses a religious blessing. In German-speaking traditions, “Gesundheit” is used after a sneeze; the word means “health”. It expresses a wish for the person’s wellbeing without referring to God. The Library of Congress also records other responses around the world, including wishes connected with long life, good fortune or the removal of an omen.

These alternatives show that the important feature may be the social response, not the exact wording. A sneeze creates a tiny moment of uncertainty: someone has made a sudden noise, and the people nearby acknowledge it with a conventional phrase. One community may frame that acknowledgement as a blessing, another as a wish for health, and another as a reference to luck or divine protection.

In English, “bless you” has become familiar enough that many people say it regardless of their religious beliefs. For them, it often functions as a polite idiom rather than a theological statement. “Gesundheit” performs much the same social job in a more openly secular form.

What the custom means now

Today, saying “bless you” is usually a courtesy. It can communicate “I noticed”, “I hope you are all right” or simply “this is the customary thing to say”. The sneezer may answer “thank you”, but there is no universal rule that they must. In many settings, choosing not to say anything is not a serious breach of manners, especially if the person sneezes repeatedly or is trying to avoid drawing attention.

The modern custom therefore has several layers. Its exact beginning is uncertain; its association with plague is plausible as a later explanation but not proven as the original source; and its spiritual meaning varies from person to person. What is clear is that people have treated sneezing as socially meaningful for a very long time.

So the best answer is not that one pope, one plague or one ancient superstition definitively created “bless you”. The phrase is more likely the surviving result of many traditions converging: fear of illness, belief in omens, wishes for protection and the ordinary human habit of responding kindly when something startling happens.