Symptoms depend on the severity of hyponatraemia and the rate of decrease in the plasma sodium concentration (1).
Signs and symptoms of hyponatraemia are often initially non specific (3)
Features of moderately severe hyponatraemia i.e. plasma sodium less than 120 mmol/l):
Features of severe hyponatraemia i.e. plasma sodium less than 110 mmol/l):
Patients with chronic hyponatraemia are unlikely to have any symptoms except during an acute exacerbation of the hyponatraemia (4).
Reference:
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.