Press your tongue to the roof of your mouth

There are moments when a sneeze is genuinely the wrong thing to do. Standing over somebody’s food. Holding a tool. In a quiet room at a funeral. Halfway through something delicate with both hands occupied. People have views on whether trying to stop one is worth it at all — several described the held-in version as more unpleasant than the sneeze — but the situations are real, and the question gets asked.

The answer has a right half and a wrong half, and it is the wrong half that is in general circulation.

Interrupt it before it fires — the flat of your tongue pressed hard against the roof of your mouth, or firm pressure just under your nose — and once it has started, let it out with your mouth open.

Why the timing is the whole thing

A sneeze is a large amount of air moving very fast. If it has already begun and you close both exits — nose pinched, mouth shut — that pressure does not disappear. It goes into the tissues around your throat, your sinuses and your ears instead.

That is not a theoretical worry. There is a published case of a healthy man in his thirties who stifled one that way, felt a pop in his neck, and turned out to have torn the back of his throat. He was in hospital for a week, fed through a tube, on intravenous antibiotics, with air having tracked down into his chest. Other reported consequences of the same move include a ruptured eardrum.

It is rare. It is also entirely avoidable, and it is avoidable by doing nothing, which is what makes it worth the paragraph.

So the distinction the tricks below rely on: before the reflex commits, you are interrupting a signal, and that is harmless. Once it commits, you are containing an explosion, and that is not.

The methods that work before it fires

Tongue to the palate. Press the flat of your tongue firmly up against the roof of your mouth and hold. This is the one people report most often and it is the one to try first, partly because it works and partly because it is invisible — you can do it mid-conversation and it is invisible from the outside.

Pressure under the nose. A finger pressed firmly into the little groove between your nostrils and your upper lip. The same idea in a different place, and easy to disguise as scratching your face.

Slow your breathing right down. Long, shallow, deliberate. It works less reliably than the other two but it costs nothing to run alongside them.

What all three have in common is that they interrupt the build-up. None of them blocks anything. If they fail, the sneeze simply happens, which is the correct outcome and not a failure of technique.

Going the other way

Sometimes the problem is the opposite — a sneeze stuck half-formed, which is its own particular misery.

Look at a bright light. This one has a name and a genetics: the photic sneeze reflex, inherited, passed down directly from a parent, and far from rare. Published estimates of how common it is range from roughly a tenth to a third, with one study putting it higher — so the honest summary is that it is common and the figure has never been pinned down.

If you have it you will already know, because you sneeze walking out of a building into sunshine. If you have it, it also works as a tool: look towards a window or a light, and the stuck one arrives.

If you do not have it, looking at a light does nothing at all, which is why this piece of advice gets passed around and then dismissed as nonsense by the people it does nothing for. Both sides are right about themselves.

The one that matters most

Driving. If you feel a sneeze coming at speed, the dangerous thing is not the sneeze — it is the two seconds you spend fighting it with one hand off the wheel and your eyes somewhere else. The same goes for anything with a blade or a hot surface in it.

Let it out, keep hold of what you are holding, and accept a second of closed eyes rather than manufacturing a struggle. A sneeze in a car is a brief loss of attention. Trying to stop one is a longer and more interesting loss of attention, arriving at the same speed.