GPAtlas🧭 When to suspect
Hiccups (singultus) are involuntary, spasmodic contractions of the diaphragm and intercostal muscles, terminated by abrupt closure of the glottis to produce the characteristic sound. They are generated by a reflex arc running between the phrenic and vagus nerves and a central (brainstem) co-ordinating centre.
In primary care the overwhelming majority are acute and self-limiting – a benign nuisance triggered by something simple. The key skill is to recognise the small minority that are persistent (lasting more than 48 hours) or intractable (lasting more than 1 month), as these are far more likely to signal an underlying cause and warrant active assessment.
When hiccups are persistent or intractable, consider gastro-oesophageal reflux disease (GORD) – the commonest underlying cause – together with drug triggers, metabolic disturbance, and central nervous system (CNS) or thoracic pathology.
| Duration | Term | What it means in practice |
|---|---|---|
| < 48 hours | Acute (transient) | Benign and self-limiting; reassure, no investigation needed |
| > 48 hours | Persistent | Suspect an underlying cause; assess and investigate |
| > 1 month | Intractable | Pathological until proven otherwise; investigate and consider specialist referral |
Simple triggers of acute hiccups include eating too quickly, hot or spicy food, carbonated drinks, alcohol, sudden temperature change, smoking, and stress or excitement. For persistent or intractable hiccups think of GORD and gastric distension, culprit drugs (notably dexamethasone, opioids and benzodiazepines), metabolic upset (uraemia, hypercalcaemia, hyponatraemia, hyperglycaemia), and structural CNS, thoracic or abdominal disease.
Source: Scottish Palliative Care Guidelines
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