Wondering what causes heartburn? While we often put this unpleasant feeling down to a big meal or stress, there are actually several possible causes, with one in four adults regularly experiencing heartburn.
If you have never had it before, heartburn is a burning sensation in the chest, which can travel up to the throat as acid reflux, sometimes leaving a sour taste in your mouth. It happens when the valve at the top of your stomach, called the lower oesophageal sphincter (LES), isn’t working as it should to keep the acid within your stomach.
