Hiccups (singultus): causes, quick help and what really helps

What to do with chronic hiccups? Causes from reflux and diaphragm irritation to neurological, quick home remedies, therapy and when to see a doctor.

1. What are hiccups?

Hiccups — medically singultus — are an involuntary, jerky contraction of the diaphragm that at the same time leads to an abrupt closure of the glottis. This produces the typical 'hic' sound. Anatomically involved are the diaphragm (the most important breathing muscle), the glottis in the larynx, the phrenic nerve (controls the diaphragm), the vagus nerve (a sensory reflex arc) and the respiratory centre in the brainstem.

Hiccups are an ancient reflex whose evolutionary purpose is disputed. A connection is suspected with breathing under water in ancestors (gill breathing) or with the act of swallowing in infants, where hiccups can ease drinking. In adulthood, hiccups no longer have any recognisable physiological function — they are usually just annoying and temporary.

Clinically important is the temporal classification: acute (up to 48 hours, almost always harmless), persistent (over 48 hours to 1 month, assessment advisable), chronic or intractable (over 1 month, always have it assessed by a doctor). While everyone knows acute hiccups, chronic hiccups are rare — but for those affected agonising, sleep-disturbing and an important indication of underlying conditions.

2. How do hiccups arise physiologically?

The hiccup reflex arc is well researched: sensory triggers (stomach distension, food residues, irritation of the diaphragm, stroke, tumours, a change in temperature) activate the vagus nerve, phrenic nerve and sympathetic fibres. The signals reach a hypothetical hiccup centre in the brainstem and cervical cord — a concretely localisable anatomical centre has not been identified, but structures in the upper cervical cord (C3–C5), in the medulla and in subthalamic brain regions are functionally involved.

From the hiccup centre the motor signal goes via the phrenic nerve to the diaphragm, which contracts abruptly — a sudden quick inhalation begins. At the same time a second signal reaches the glottis, which closes after about 35 milliseconds. This simultaneous strong inspiration with a closed glottis produces the characteristic 'hic' sound. The typical frequency is 2 to 60 hiccup episodes per minute.

From this understanding follow the most important therapeutic levers: interrupting the reflex arc through competing sensory stimuli (e.g. a fright, a cold stimulus in the throat, breathing manoeuvres such as Valsalva), inhibition of the central excitation (sedatives, anticonvulsant substances) and treatment of the peripheral cause (gastric emptying with a full meal, reflux therapy, tumour therapy).

3. Acute hiccups: harmless and common

Acute hiccups are a universal human experience — probably every person experiences an episode several times a year. The most common triggers are:

• Hasty eating with swallowed air — the stomach distension irritates the diaphragm directly
• Carbonated drinks — overinflation of the stomach
• A sudden change in temperature — very hot or cold food/drink, moving from warm into cold rooms
• Alcohol — a direct stimulus to the stomach lining and a central effect
• Excitement, stress, laughing — vegetative activation
• Spicy food or strongly seasoned dishes
• Smoking — above all after a longer break
• Lavish meals with a strong filling of the stomach

Acute hiccups usually last a few minutes to hours and disappear by themselves — without any medical intervention. Most home remedies probably do not work through their specific mechanisms but because they coincide, by chance or through distraction, with the natural end of the episode. If the hiccups last longer than 48 hours, they are called persistent — then an assessment is worthwhile.

4. Persistent and chronic hiccups

Hiccups going beyond the 48-hour limit are rare and diagnostically relevant. They can massively disturb sleep, make eating difficult, lead to weight loss and exhaustion — and at the same time are often an indication of an underlying condition. With chronic hiccups (over 1 month), a systematic assessment is required.

The most important categories of cause with persistent hiccups:

• Reflux disease and upper GI problems (very common, often overlooked) — see next chapter
• Irritation of the diaphragm through inflammatory processes: a subphrenic abscess, pancreatitis, cholecystitis, pleurisy, pericarditis
• Tumours with irritation of the phrenic nerve or vagus: mediastinal tumours, bronchial carcinoma, liver tumours, brain tumours
• Neurological diseases: strokes (especially in the brainstem), multiple sclerosis, encephalitis, brain abscesses, brain tumours
• Medication side effects (see separate chapter)
• Metabolic disorders: kidney insufficiency with uraemia, electrolyte imbalances (hyponatraemia, hypocalcaemia), diabetes mellitus
• Psychogenic or functional — rarer than assumed and a diagnosis of exclusion

Clinical pointer: hiccups that continue during sleep are more likely organically caused — hiccups that pause at night are more often psychogenic or functional. This simple history question helps enormously in everyday life with the diagnostic classification.

5. Reflux as a common cause

Gastro-oesophageal reflux disease (heartburn) is one of the most common — and most easily treatable — causes of persistent hiccups. Through the rising of stomach acid, the oesophagus and indirectly the diaphragm too are irritated. Common accompanying symptoms: a sour taste, burning retrosternal complaints, hoarseness and a chronic irritable cough.

Therapeutic trial: a 4- to 6-week trial with a proton pump inhibitor (PPI: pantoprazole, omeprazole, esomeprazole) is often diagnostic and therapeutic at the same time — if the hiccups improve, reflux was the cause. Accompanying lifestyle adjustments: smaller meals, no eating late, raising the head of the bed, no alcohol/coffee/spicy food in the evening, weight reduction with excess weight. More under heartburn.

If PPIs are not sufficient: additionally H2 blockers (famotidine), alginate preparations (Gaviscon), with a proven hiatus hernia a surgical fundoplication if needed. A gastroscopy is indicated with persistent complaints despite therapy and before any surgery.

6. Neurological causes

Persistent hiccups can be the first or isolated symptom of a serious neurological disease. Particularly relevant:

Stroke in the brainstem

Strokes in the medulla oblongata — above all the lateral medullary syndrome (Wallenberg syndrome) — can cause stubborn hiccups. Accompanying symptoms: one-sided sensory disturbance in the face and on the body, vertigo, double vision, swallowing difficulties, hoarseness, hearing loss. With these constellations, immediate stroke diagnostics are essential — hiccups after a stroke must not be dismissed as a trivial symptom.

Multiple sclerosis

Chronic hiccups can also occur with multiple sclerosis, above all with lesions in the brainstem. Usually not isolated but combined with other neurological symptoms.

Brain tumours and intracranial processes

Tumours in the posterior cranial fossa or at the brainstem can directly irritate the hiccup reflex arc. Accompanying symptoms: headaches, visual disturbances, double vision, mood changes, focal neurological deficits. Imaging with MRI is essential here.

Brain abscesses, meningitis, encephalitis

Inflammatory processes can likewise trigger hiccups — usually with fever, headaches and changes in consciousness. This constellation is always a medical emergency.

7. Internal-medicine and surgical causes

Irritation in the abdomen (subphrenic)

Anything that irritates the diaphragm from below can cause persistent hiccups: a subphrenic abscess after operations, acute pancreatitis, cholecystitis (gallbladder inflammation), liver tumours and metastases, stomach ulcers, overinflation of the stomach through aerophagia.

Chest diseases

In the thorax, tumours of the mediastinum, bronchial carcinoma, pleurisy and pericarditis can irritate the phrenic nerve. Accompanying symptoms: cough, shortness of breath, chest pain, weight loss.

Metabolic derangements

Kidney insufficiency with uraemia, diabetes mellitus with hyperglycaemia or ketoacidosis, hyponatraemia, hypocalcaemia and severe liver insufficiency can cause hiccups. A basic work-up with electrolytes, kidney and liver values and blood sugar belongs to the assessment.

Postoperative

After operations — above all in the abdomen or chest — persistent hiccups are not rare. Causes: irritation through lying in a certain position, postoperative aerophagia, a subphrenic abscess, irritation of the phrenic nerve through the operation or a tube.

8. Medications as a trigger

Various medications can cause persistent hiccups — an often underestimated cause:

• Glucocorticoids (corticosteroids) — dexamethasone and methylprednisolone are classic triggers, especially in high doses or as IV pulse doses
• Chemotherapy agents: cisplatin, carboplatin, etoposide — hiccups are a known side effect, often in connection with antiemetic accompanying therapy
• Benzodiazepines — a paradoxical reaction, above all in higher doses or in older patients
• Opioids: morphine, tramadol — occasionally described
• Antiparkinson drugs: levodopa
• Methylxanthines: theophylline
• Inhaled beta-2 sympathomimetics: salbutamol — rarely, but described
• Substances with a GABA-ergic effect — paradoxical reactions
• Antibiotics — individual case reports for penicillins and cephalosporins
• Alcohol in high amounts

Important: with a temporal connection between taking a medication and the onset of hiccups, discuss it with a doctor — often a dose reduction, a switch or additional antiemetic/anti-hiccup therapy helps. More: Medication interactions, Taking medications correctly.

9. Hiccups in infants and children

Hiccups in infants are very common, harmless and usually physiological — they begin in the womb and can sometimes be felt by pregnant women. In the first year of life, many infants have several hiccup episodes daily, often after drinking through swallowed air.

What helps: an upright position after drinking, gentle patting on the back for burping, smaller drinking amounts with breaks, switching sides when breastfeeding, a teat with a smaller opening when bottle-feeding. Hiccups after drinking are normal and need no treatment.

A medical assessment in infants is only sensible with: persistently disturbed drinking or sleeping through hiccups, frequent spitting up/vomiting (suspected reflux), failure to thrive, other abnormalities. In older children with persistent hiccups, the same diagnostics apply as in adults, adapted to the age.

10. Hiccups in pregnancy

In pregnancy, hiccups are more common — above all through two mechanisms: mechanical pressure effects from the growing child, which shifts and irritates the diaphragm; and hormonal changes that loosen the sphincter between the stomach and the oesophagus and thereby favour reflux. The fetal hiccup behaviour too is often perceived as kicking or movements — that is physiological and a sign of healthy development of the child's breathing musculature.

What helps pregnant women: small, frequent meals, eating and drinking more slowly, low-carbonation drinks, a left-sided or half-sitting sleep position, alginate preparations (Gaviscon) against accompanying reflux if needed. With very pronounced or stubborn hiccups, consultation with a doctor, since systemic medications are to be used cautiously in pregnancy.

11. When to see a doctor? (warning signs)

Have it assessed by a doctor promptly if:

• hiccups last longer than 48 hours
• hiccups considerably disturb sleep or make eating impossible
• accompanying reflux symptoms or swallowing difficulties
• accompanying symptoms such as abdominal or chest pain, vomiting, shortness of breath, cough
• neurological symptoms: headaches, visual disturbances, sensory disturbance, weakness, swallowing difficulties, vertigo
• accompanying unintentional weight loss, tiredness, night sweats
• hiccups after an operation or with a known tumour disease
• a temporal connection with a new medication
• recurrent hiccups with long episodes

12. Diagnostics: what the doctor does

With persistent or chronic hiccups, a systematic assessment takes place:

• History: onset, duration, frequency, triggers, accompanying symptoms, hiccups during sleep?, medications, pre-existing conditions, operations
• Clinical examination: inspection of the ENT area, abdomen, neurological status, lymph nodes, reflexes
• Basic laboratory: full blood count, inflammation values, liver and kidney values, electrolytes (Na, K, Ca), glucose, HbA1c, lipase and amylase if needed (the pancreas)
• Chest imaging: chest X-ray as a basic examination, chest CT if a tumour or mediastinum process is suspected
• Abdominal imaging: ultrasound (liver, gallbladder, pancreas, free fluid), abdominal CT if suspected
• Skull imaging: MRI if a central cause is suspected (always recommended with chronic hiccups with neurological symptoms)
• Gastroscopy: if reflux, oesophagitis, a stomach ulcer or a tumour is suspected
• Extended diagnostics: bronchoscopy if bronchial carcinoma is suspected, CSF diagnostics if needed with central processes

More: Preparing for a doctor's appointment, Understanding blood values.

13. Quick help: what works immediately

With acute hiccups there are dozens of home remedies — most are not scientifically proven, but many nevertheless work through distraction, irritation of the reflex arc or simply through the natural end of the episode. Plausibly effective are:

• Hold your breath for 10–20 seconds — raises CO2 in the blood, dampens the excitability of the diaphragm
• Valsalva manoeuvre — breathe out against a closed mouth and nose, about 10 seconds
• Drink from a glass of water in a bent-forward posture — the unusual act of swallowing interrupts the reflex arc
• Quickly drink a glass of cold water in one go — a cold stimulus in the throat
• Let a spoonful of sugar dissolve in the mouth — a sensory stimulus at the back of the palate, well documented in a small study
• A spoonful of apple cider vinegar — a sour stimulus activates vagal fibres
• Have someone give you a fright — works sometimes, but not reliably
• Press gently on the base of the tongue or trigger the gag reflex — a strong competing sensory stimulus
• Pull the knees to the chest and bend forward — compresses the diaphragm and can interrupt the reflex
• Carefully apply light pressure to the eyeball (with closed eyes) — activates the vagal reflex (not with eye diseases!)

Most of these manoeuvres work through two mechanisms: hypercapnia (raised CO2) and vagal or sympathetic reflex stimulation. Which one helps in the individual case is individually different — trying out is allowed.

14. Home remedies in the evidence check

A brief classification of popular tips:

Plausible and effective (small studies): sugar at the base of the tongue, cold water, holding your breath, the Valsalva manoeuvre, pulling the knees to the chest. With these methods there are at least published case series or small studies that suggest a positive effect.

Folk medicine without clear evidence, but harmless: drinking upside down, breathing into a paper bag (caution with asthma!), vinegar on sugar, letting peanut butter dissolve in the mouth, honey, a spoonful of mustard. These methods do not usually do harm and can help through distraction.

Rather not recommended: a forceful fright (can be problematic in older people or those with heart conditions), eye-pressure manoeuvres with eye diseases, extremely hot or ice-cold drinking (mucosal damage).

Important: with persistent hiccups over 48 hours, home remedies usually no longer bring anything — here a medical assessment is the decisive step.

15. Drug therapy for chronic hiccups

With chronic or intractable hiccups (over 1 month), medications are established — best in an interdisciplinary consultation:

• Baclofen (10–25 mg 3x daily): a GABA-B agonist with good evidence in chronic hiccups — considered first-line therapy
• Metoclopramide (10 mg 3–4x daily): an antiemetic with a prokinetic effect — above all with reflux-related hiccups
• Gabapentin (300–900 mg/day): with a neuropathic component and post-stroke hiccups
• Chlorpromazine (25–50 mg, the classic hiccup medication): the only specifically approved indication in the US — rarer today because of side effects
• Proton pump inhibitors (pantoprazole, omeprazole): with accompanying reflux disease
• Anticonvulsants such as valproate or carbamazepine: with a central-neuralgic cause
• Olanzapine and haloperidol: in specialised palliative-medicine situations
• Phrenic nerve block with a local anaesthetic: invasive, with treatment-resistant cases — only in specialised centres

The choice of medication depends on the cause, accompanying constellation and side-effect profile. A consistent uncovering and treatment of the underlying cause is always the most important step.

16. What you can do yourself

• Eat slowly and calmly — smaller bites, chew thoroughly, in a relaxed atmosphere
• Prefer low-carbonation drinks — especially with food
• Keep alcohol moderate — above all in the evening and in combination with lavish meals
• Avoid late or lavish meals — last main meal 3 hours before going to sleep
• Optimise the sleep position: a left side-lying position or the head slightly raised — reduces night-time reflux
• Stop smoking — promotes reflux and irritates the reflex arc
• Stress management — breathing exercises, mindfulness, regular exercise
• Keep a diary with recurrent hiccups: triggers, timing, duration, accompanying symptoms — valuable for a medical assessment
• Have your medications checked for possible hiccup triggers — especially corticosteroids, chemotherapy, benzodiazepines

How brite helps you with hiccups

brite supports you in better understanding hiccups (singultus) and keeping an overview of your medications.

• Intake reminder — take proton pump inhibitors, baclofen or prescribed medications regularly: brite reminds you on time. Set up a reminder
• Interaction check — recognise hiccups as a medication side effect and check combinations for free — especially with corticosteroids, chemotherapy, benzodiazepines. Check now
• Health timeline — document a hiccup diary with frequency, triggers and accompanying symptoms over time — valuable for the medical work-up.
• Digital medication plan — all medications clearly laid out for your GP, gastroenterology, neurology and pharmacy. To the medication plan

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