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Hiccup

life science Maturity 11-13 Next article →

Have you ever felt a sudden, tiny jump in your chest? That is a hiccup, also known by its scientific name, singultus. A hiccup is an involuntary action, which means your body does it without you asking. It happens because of a reflex arc, a quick path of signals in your body. This reflex causes your diaphragm to jerk or spasm suddenly. The diaphragm is the large muscle that helps you breathe. When it jerks, the glottis, or the space between your vocal cords, closes quickly. This happens in about 35 milliseconds and creates that famous "hic" sound.

Many different things can trigger these little spasms. You might eat your food too fast or swallow too much air. Drinking bubbly beverages or eating spicy foods can also start them. Even laughing for a long time can cause a bout of hiccups. Sometimes, hiccups are linked to medical conditions like diabetes or kidney failure. In very rare cases, they can even signal a serious heart problem. Most hiccups are just a short bother that goes away on its own.

Scientists have some interesting ideas about why we have this reflex. One big idea is called the burping reflex hypothesis. This theory suggests hiccups helped young mammals drink more milk. When a baby drinks, air can get trapped in their stomach. This air bubble might trigger the hiccup reflex to help. The reflex creates suction to pull the air up and out. This acts like a built-in burp to make more room for milk.

Another idea is called the phylogenetic hypothesis. This theory looks at how hiccups might be a leftover from the past. Some amphibians, like tadpoles, gulp air and water using a simple reflex. This reflex is very similar to the way humans hiccup. Scientists noticed that the pathways for hiccups form very early in a baby. They actually form before the pathways for normal breathing are ready. This might be why tiny premature babies spend about 2.5% of their time hiccuping.

Most people just wait for hiccups to pass, which usually takes under 30 minutes. People use many folk remedies, like drinking water upside-down or holding their breath. Some people even try eating a spoonful of peanut butter. In 2021, a study in the journal JAMA looked at a tool called FISST. This device, also called "HiccAway," uses suction to help stop hiccups. In the study, over 90% of people felt it worked better than home remedies. Some hiccups can last a very long time, which is called being intractable.

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