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Hiccup

life science Maturity 11-13 Next article →

A hiccup, known scientifically as singultus, is an involuntary contraction of the diaphragm. The diaphragm is a large muscle that helps you breathe. A hiccup occurs through a reflex arc, which is a rapid pathway of signals in the body. This reflex triggers a sudden spasm in the diaphragm muscle. Almost immediately, the glottis—the space between your vocal cords—closes shut. This closure happens in about 35 milliseconds. This rapid sequence creates the characteristic "hic" sound.

Many different factors can trigger these involuntary spasms. Common causes include swallowing air excessively or eating food too quickly. Consuming spicy foods, alcohol, or carbonated beverages can also start a bout of hiccups. Some people experience them after laughing vigorously for a long time. In some instances, hiccups may be linked to medical conditions. These can include diabetes mellitus, kidney failure, or even a myocardial infarction, which is a heart attack.

Scientists have proposed several interesting theories regarding why this reflex exists. One leading idea is the burping reflex hypothesis. This theory suggests hiccups helped young mammals consume more milk. When a mammal suckles, air can get trapped in the stomach. This air bubble may stimulate sensory receptors in the stomach and esophagus. The brain then triggers the hiccup reflex to create suction in the chest. This suction pulls the air up and out of the esophagus, effectively burping the animal.

Another theory is the phylogenetic hypothesis. This idea suggests hiccups are an evolutionary remnant from earlier amphibians. For example, tadpoles gulp air and water using a simple motor reflex. This reflex is very similar to the mammalian hiccup. Interestingly, the motor pathways for hiccuping form during fetal development before the pathways for normal lung ventilation. This might explain why premature infants spend about 2.5% of their time hiccuping. They may be gulping in a way similar to amphibians.

Most hiccup episodes are brief and last under 30 minutes. However, the duration can be classified in different ways. A series of hiccups is called a bout. If a bout lasts more than 48 hours, it is termed persistent or protracted. If hiccups last for more than one month, they are called intractable hiccups. While men and women are affected equally, men are more likely to develop these protracted or intractable cases. In rare cases, intractable hiccups can cause significant health problems or even death.

People use many different methods to try and stop hiccups. Many rely on folk remedies, such as drinking water upside-down or breathing into a paper bag. Some people try acupressure by pressing firmly below the collarbones for sixty seconds. There is also a breathing exercise called supra-supramaximal inspiration, or SSMI. This method involves exhaling completely, taking a deep breath, and holding it through several specific steps. In 2021, a study published in the journal JAMA tested a scientific tool called FISST. This device, branded as "HiccAway," uses forceful suction to stop hiccups. Over 90% of participants reported better results with this tool than with home remedies.

History shows that hiccups can sometimes last for incredible lengths of time. An American man named Charles Osborne had hiccups for 68 years. His attack lasted from 1922 until 1990, totaling an estimated 430 million hiccups. In 2007, a teenager named Jennifer Mee became famous for hiccuping 50 times per minute. Another case involved a British singer named Christopher Sands. He hiccuped about 10 million times over 27 months. His hiccups were eventually caused by a tumor on his brain stem. Surgery to remove the tumor finally stopped his condition in 2009.

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