Indigestion or an upset stomach – which is not surprisingly very common over the Christmas period with so much rich food on offer – happens when your body struggles to break down food and digest it properly. Although it is described by medical experts as dyspepsia it is important to understand that it is not a disease or medical condition rather a collection of symptoms that differ from person to person. It generally describes discomfort or a burning feeling in the stomach, often accompanied by nausea, bloating, flatulence, cramps, constipation and diarrhoea. Indigestion may also cause heartburn due to stomach acid reflux, which can leave a bitter taste in the mouth and irritate the oesophagus (food pipe). These symptoms may come and go or they may be constant lasting for a few days or more. In most cases indigestion is not a serious health disorder, although it is a warning sign that your diet and lifestyle are not as healthy as it could and positive changes need to be made.