It occurs due to muscle contractions.
Hiccups occur due to periodic contractions of certain respiratory muscles located in the chest and diaphragm. However, the exact function of hiccups in the body remains a mystery to science.
Most often, hiccups arise in response to irritation of the stomach, when a signal through the vagus nerve is sent to the brain, and then transmitted to the diaphragm via the phrenic nerve, causing it to contract, which leads to hiccups.
Generally, hiccups occur if a person has not eaten for a long time, has poorly chewed their food, or has consumed a large amount of liquid. Additionally, they can be a result of nervous tension or general hypothermia of the body.
Overall, periodically occurring and quickly passing hiccups are not dangerous to health. However, if they become painful and a person cannot get rid of them for an extended period, it may indicate the presence of a serious illness.
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