Always having acidity and heartburn and nausea is not necessarily due to stomach cancer, but may also be caused by other stomach diseases such as gastric ulcer and chronic gastritis. Acid heartburn and nausea all the time are usually considered as gastric ulcer. After the lesion involves the muscle layer, it will lead to depression and defect of stomach wall, which can lead to perforation and bleeding in serious cases. In addition, excessive acidity and heartburn can also be caused by erosion of the gastric mucosa, superficial gastritis or atrophic gastritis. It differs from gastric ulcer in that the lesion is superficial and does not usually involve the muscular layer. In addition, this condition may also be caused by food irritation, such as heartburn and excessive acidity after eating spicy or cold food. Of course, stomach cancer patients may also experience abdominal pain, acid reflux, nausea and other symptoms, so further examination is needed to determine. If frequent occurrence of excessive stomach acid, heartburn and nausea, patients should seek medical advice as soon as possible to clarify the diagnosis under the guidance of gastroenterologists. In daily life, they should pay attention to a light diet and maintain a regular life.