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Heartburn is a sensation of burning in the chest caused by stomach acid backing up into the esophagus (food pipe). The burning is usually in the upper and central part of the chest, just behind the sternum (breast bone). The burning can worsen or can be brought on by lying flat or on the right side.
Heartburn is a painful burning sensation, experienced in the chest area due to the reflux of acid and other stomach contents in the oesophagus. This reflux, triggered usually by poor diet and lifestyle is caused by the relaxation or reduction in pressure of lower oesophageal sphincter. Heartburn is a common physiological condition, experienced occasionally by most adults but its ignorance can lead to a severe form known as gastro oesophageal reflux disease.