Hiccups: Causes, Symptoms & When to See a Doctor

Hiccups (singultus) are involuntary, spasmodic contractions of the diaphragm and intercostal muscles, followed by abrupt glottic closure → "hic" sound.

Mechanism

Reflex arc: Afferent (vagus, phrenic, sympathetic T6–T12) → hiccup center (medulla, near respiratory centers) → Efferent (phrenic → diaphragm; accessory → intercostals; vagus → glottis).

Common Triggers (Benign, Self-Limited)

• Gastric distension (overeating, carbonated beverages, air swallowing).
• Temperature change (hot then cold food/drink).
• Alcohol, spicy foods.
• Emotional stress, excitement, laughter.
• Medications (steroids, benzodiazepines, opioids, chemotherapy).

Persistent (>48h) / Intractable (>1 month) Causes

Category	Examples
GI	GERD, esophagitis, gastritis, pancreatitis, hepatitis, bowel obstruction
Thoracic	Pneumonia, pleurisy, pericarditis, MI, aortic aneurysm
CNS	Stroke, tumor, MS, encephalitis, meningitis, TBI
Metabolic	Uremia, hyperglycemia, hyponatremia, hypocalcemia
Drugs	Chemo, steroids, benzos, opioids, Parkinson's meds
Psychogenic	Conversion disorder, malingering

Management

• Acute: Breath-holding, Valsalva, cold water sip, sugar granule on tongue, paper bag breathing (↑CO₂), knee-to-chest.
• Persistent: Treat underlying cause. Pharmacologic: chlorpromazine (first-line FDA), baclofen, gabapentin, metoclopramide, haloperidol.
• Refractory: Phrenic nerve block, vagal nerve stimulation.

When to See a Doctor

• Duration >48 hours.
• Interferes with sleep, eating, breathing.
• Associated with neurologic signs, chest/abdominal pain, weight loss.