Drinking enough water is important in keeping healthy, both physically and mentally, and patients should keep their fluids up when unwell, particularly in conditions that can cause dehydration.

We would encourage patients to drink more if they have symptoms of dehydration, such as feeling thirsty – including in hot weather or when exercising – or passing dark-coloured urine.

This case report highlights that excessive water intake can have important consequences for patients, and this is something that healthcare professionals, and patients, should be mindful of.