The main symptoms of stomach acid are these: 1, heartburn, people with a lot of stomach acid often feel the location of the heart socket, a burning like irritation. It is more likely to happen after eating, lying down, bending over, especially after eating greasy food and food with high sugar content.2, esophageal pain, feeling pain in the esophagus after eating is caused by stomach acid being squeezed into the esophagus by food.3, eating with a bitter taste, the stomach acid enters into the throat area and produces a bitter taste, and even a choking sensation.4, unusual hoarseness, acid reflux can stimulate the vocal cords, and if you often after eating appear hoarse, may belong to this situation. 5, cough, asthma and many other respiratory symptoms, such as cough or asthma may be caused by acid reflux, because stomach acid will stimulate the nerves in the chest cavity, and repeated reflux will lead to asthma. 6, nausea, nausea is also a common symptom of acid reflux. If you often feel that the mouth secretes a lot of saliva and want to vomit, consider that you have acid reflux.