Why do adults get hiccups

Overview

Hiccups, medically known as singultus, are involuntary contractions of the diaphragm muscle followed by sudden closure of the vocal cords, producing the characteristic 'hic' sound. The phenomenon has been documented since ancient times, with Hippocrates mentioning hiccups in his medical writings around 400 BCE. In modern medicine, hiccups are classified by duration: acute hiccups last less than 48 hours, persistent hiccups continue for over 48 hours but less than a month, and intractable hiccups persist for over a month. While most people experience occasional hiccups, chronic cases are relatively rare, affecting approximately 1 in 100,000 people annually. The longest recorded case belongs to American Charles Osborne, who hiccupped continuously from 1922 until 1990—a remarkable 68-year episode documented in the Guinness World Records. Historically, various cultures developed folk remedies for hiccups, from holding one's breath to drinking water upside down, though scientific understanding of the condition has evolved significantly since the 19th century.

How It Works

The hiccup reflex involves a complex neurological pathway known as the hiccup reflex arc. It begins when stimuli trigger the phrenic and vagus nerves, which send signals to the diaphragm—the primary muscle responsible for breathing. The diaphragm contracts involuntarily, causing a sudden inhalation. Approximately 35 milliseconds later, the glottis (the opening between the vocal cords) snaps shut, creating the distinctive 'hic' sound by abruptly stopping airflow. This reflex is controlled by the brainstem, specifically areas including the medulla oblongata and the nucleus tractus solitarius. Common triggers that initiate this reflex include stomach distension from eating too quickly or consuming carbonated beverages, which stimulates the vagus nerve; alcohol consumption, which can irritate the phrenic nerve; sudden temperature changes in the esophagus; and emotional factors like stress or excitement. Medical conditions can also trigger persistent hiccups through various mechanisms: gastroesophageal reflux disease (GERD) irritates the esophagus, pneumonia or pleurisy affects the diaphragm directly, and brain disorders like strokes or tumors disrupt the neurological control centers.

Why It Matters

Understanding hiccups matters because while most episodes are harmless and self-limiting, persistent hiccups can significantly impact quality of life and indicate serious underlying conditions. Chronic hiccup sufferers experience sleep disruption, difficulty eating and drinking, weight loss, fatigue, and social embarrassment. From a medical perspective, hiccups lasting over 48 hours warrant investigation as they may signal disorders like GERD (present in approximately 30% of chronic cases), pneumonia, kidney failure, or even brain tumors. Treatment approaches range from simple breath-holding techniques and drinking cold water for acute cases to medications like chlorpromazine or baclofen for persistent episodes. In severe cases, procedures like phrenic nerve blocks or diaphragm pacing may be necessary. Research into hiccup mechanisms contributes to broader neurological understanding, particularly regarding reflex pathways and brainstem function. Additionally, studying hiccup treatments has led to insights applicable to other involuntary movement disorders.