Heartburn
Heartburn is a burning sensation in your chest. [3] Sometimes it occurs with a bitter, acrid taste in your mouth and throat. It is caused by a backflow of the contents of your stomach into your esophagus. The acidity of these contents causes the burning sensation you feel.
Many conditions can cause heartburn and acid reflux, such as gastrointestinal reflux disorder, indigestion, and peptic ulcers. These are the conditions most people who experience this symptom are more likely to suspect, not stomach cancer. It is worth checking with your doctor what the cause of your heartburn is. If stomach cancer is the cause, catching it early can help improve your outlook.