Functional dyspepsia may be stomach cancer, or it may be caused by, chronic gastritis, functional dyspepsia, gastric ulcer and other factors. 1. Gastric cancer: the disease may be caused by heredity, Helicobacter pylori infection. Early stage of the disease may have the symptom of hidden pain in the stomach, which is usually more obvious after meals, and with the progress of the disease, the pain may persistently aggravate and radiate to the lower back. 2. Chronic gastritis: chronic gastritis may be caused by Helicobacter pylori infection, autoimmune factors, gastric mucosa inflammatory lesions, gastric contents stimulate the mucous membrane leading to hidden pain in the stomach. 3. Functional dyspepsia: the disease may be caused by insufficient gastrointestinal dynamics, Helicobacter pylori infection, due to gastric emptying obstacles, the patient may feel bloating or hidden pain in the stomach. Stomach daily hidden pain may also be related to gastric ulcer, duodenal ulcer and other factors, it is recommended that patients go to the hospital in a timely manner, under the guidance of the physician for related treatment.