Irregular diet, excessive alcohol consumption, mental stress, and drug abuse are the causes of chronic gastritis. It is worth noting that 30% of the patients with chronic gastritis are suffering from functional dyspepsia, which is mostly caused by white-collar workers and company executives, mainly due to excessive mental stress. Patients with functional dyspepsia tend to seek medical help everywhere, and their medical records are often as thick as a book, but they have not been able to solve the problem. Patients suffer from indigestion symptoms such as epigastric pain, burning stomach, acid reflux, belching and nausea. Mr. Chen is a patient with functional dyspepsia. He became a company supervisor at the age of 33, and his symptoms of stomach pain, acid reflux and belching are aggravated when he is under pressure at work or in a bad mood, and his stomach bloating and stomach pain have lasted for more than half a year, but no abnormalities were found in the gastroscopy and ultrasound examinations at the hospital. The doctor diagnosed him as having “functional dyspepsia” and told him to relax and maintain a regular diet. In general, patients with chronic gastritis can see the gastric mucosa turn red, erosion or even ulcers when doing gastroscopy. In contrast, patients with functional dyspepsia have varying degrees of dyspepsia symptoms, yet there are no obvious abnormalities on gastroscopy. These patients may also have mental symptoms such as insomnia, anxiety, depression, and headache. Why do you have digestive symptoms when there is no problem with gastroscopy? Professor Zeng Zhirong explained that stress is the main cause of “functional dyspepsia” because stress stimulation is transmitted to the brain, which sends signals to promote gastric acid secretion, which increases gastric activity and reduces blood flow to the gastric mucosa. Under normal conditions, mucus has the ability to protect the mucosa, but under stressful conditions, the protective effect of mucus is reduced, resulting in damage to the gastric mucosa. For functional dyspepsia, medications can be taken to improve symptoms, such as antacids such as H2 receptor antagonists (e.g., cimetidine) or proton pump blockers (e.g., omeprazole) to relieve pain in patients with epigastric pain, heartburn, and acid reflux, and prokinetic drugs such as morpholine in patients with fullness and nausea. For those with stubborn symptoms after the above conventional treatment is ineffective, antidepressants can be added as prescribed by the doctor. Zeng Zhirong believes that, in fact, for this “undetectable disease”, the most fundamental preventive measure is to establish and cultivate good lifestyle habits, eat regularly and quantitatively, reduce fat intake, especially to reduce chili, coffee, onions and other stimulating foods. In addition, work and life should be separated, relaxed mood, intestines and stomach also benefit.