Hyponatremia and hiccups: what to know

Hiccups are repeated involuntary spasms of the diaphragm, often triggered by stomach irritation, reflux, a large meal, or changes in breathing. Low sodium means the blood sodium concentration is below the expected range and can develop from excess water, fluid losses, medicines, or illnesses affecting the heart, kidneys, liver, or hormones. When hyponatremia becomes more pronounced, nausea, headache, unsteadiness, confusion, drowsiness, or seizures may occur. Persistent hiccups can have many explanations, including acid reflux or gastritis, so a clinician may use an examination and blood tests to separate these possibilities.

If hiccups continue, keep track of their duration, meals, alcohol, new medicines, vomiting, diarrhoea, and fluid intake. Arrange a GP assessment if they interfere with sleep, eating, drinking, or breathing, or occur with nausea, headache, weakness, or confusion. Do not rapidly drink large amounts of water or take salt tablets to correct a suspected sodium problem; the safe treatment depends on the cause and how quickly the level changed. Continue prescribed medicines unless a clinician tells you otherwise.

Seek emergency care for confusion, extreme drowsiness, a seizure, fainting, severe headache, repeated vomiting, trouble breathing, or a sudden change in behaviour. These symptoms can signal a serious electrolyte or neurological problem. Persistent hiccups with chest pain, severe abdominal pain, or inability to keep fluids down also need prompt assessment.

Ask whether sodium and other electrolytes should be checked, whether a medicine or illness could be contributing, and whether reflux treatment is appropriate. Ask which drinks and medicines are safe while the cause is being investigated.