Sneezing is a reflex
The reason that we sneeze is because our bodies are reacting to irritants—including dust, pollen, and animal dander—in the nose lining. When these irritants get into our noses, our brain receives a signal to get rid of them and we sneeze. You take a deep breath and hold it, causing the muscles in the chest to tighten. That pressure forces your tongue against the top of your mouth and the air to travel quickly out of your nose when you release your breath.
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