why do we get hiccups

Hiccups are involuntary spasms of the diaphragm muscle that cause the vocal cords to close suddenly, producing a characteristic sound.

The Reflex Arc. Hiccups are managed by a reflex arc, a pathway of nerves including the vagus and phrenic nerves that carry signals between the diaphragm and the brainstem. When this pathway is irritated, it triggers the diaphragm to contract involuntarily.
Common Triggers. Common triggers for brief episodes include eating too much or too fast, drinking carbonated or alcoholic beverages, swallowing excess air, and sudden emotional stress or excitement.
Persistent Hiccups. Hiccups lasting longer than 48 hours may indicate underlying issues, such as gastrointestinal diseases, central nervous system disorders, metabolic imbalances, or side effects from certain medications and surgeries.
Evolutionary Theories. Some researchers suggest hiccups may be a vestigial reflex from our evolutionary past, potentially serving a purpose in fetal development or helping infants clear air from their stomachs.

Hiccups - Symptoms and causesmayoclinic.org · published March 2, 2023
Hiccups, Causes & Treatmentmy.clevelandclinic.org · published April 17, 2024
Hiccupsmedlineplus.gov · published September 2, 2025
Singultus - StatPearls - NCBI Bookshelfncbi.nlm.nih.gov · published August 9, 2025
Hiccups - Digestive Disorders - Merck Manual Consumer Versionmerckmanuals.com · published April 9, 2026
Why do we hiccup—and is there a better way to get rid of them? | National Geographicnationalgeographic.com · published April 5, 2023
Hiccups - Gastroenterology - MSD Manual Professional Editionmsdmanuals.com · published April 8, 2026
Why do we hiccup?doi.org · published November 1, 1997