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Why Do We Yawn, Sneeze and Hiccup?

Why Do We Yawn, Sneeze and Hiccup?

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Why does the body sneeze, yawn, or hiccup without asking for permission? In this episode, we explore three very different automatic responses. We discover how sneezing helps react to irritation inside the nose, what happens to the diaphragm during a hiccup, and why yawning remains more mysterious than it seems. We also explain why bright light makes some people sneeze and how simply seeing someone yawn can trigger the same response. Three ordinary behaviors reveal just how much of the body is controlled by nervous system circuits that work automatically, without conscious instructions.

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