Hiccups are an involuntary reflex caused by sudden, irregular contractions of the diaphragm, the muscle located beneath the lungs, followed by the abrupt closure of the vocal cords, which produces the characteristic sound.
How hiccups occur
When the diaphragm contracts unexpectedly, air rushes quickly into the lungs. Moments later, the vocal cords snap shut, blocking the passage of air and creating that familiar "hic!" sound. This is a reflex arc involving the phrenic nerve and the vagus nerve, two of the main nerves that control the diaphragm and the throat.
Common triggers
There are several reasons why hiccups can appear in everyday situations:
- Eating or drinking too quickly, which causes air to build up in the stomach.
- Drinking carbonated or very cold beverages, which irritate the phrenic nerve.
- Overeating, since a full stomach puts pressure on the diaphragm.
- Sudden changes in body temperature, such as drinking something hot followed by something very cold.
- A tense emotional state or nervous excitement, which can disrupt the breathing pattern.
When should you worry?
In most cases, hiccups go away on their own within a few minutes and require no treatment. However, when the discomfort lasts more than 48 hours, it is referred to as persistent hiccups, and if it continues for more than a month, it is considered intractable hiccups. In these cases, it may be linked to irritation of the phrenic nerve, gastroesophageal problems, neurological disorders, or side effects of certain medications, so it is advisable to consult a healthcare professional.
Common remedies
Various popular methods can help stop hiccups, although scientific evidence on their effectiveness is limited. Some of the most widespread include breathing into a paper bag for a short period, holding your breath for as long as possible, swallowing a teaspoon of sugar, or gently pressing on your eyes. All of these methods aim to stimulate the vagus nerve or temporarily alter the breathing pattern to interrupt the hiccup cycle.
