Yang, male, 45 years old. Chief complaint: He has a habit of drinking alcohol and has been working in a high-temperature workshop for a long time. Additionally, his eating habits are irregular, leading to the development of stomachache over time. One day, the stomachache flared up and persisted for several days, causing restlessness. He experienced a burning pain in the epigastric region that was unbearable to touch, thirst, dark urine, loose stools with difficulty, nausea, inability to eat, and foul breath. His tongue coating was thick, yellow, and greasy, and his pulse was slippery and rapid. Previous doctors prescribed formulas mostly containing Pericarpium Citri Reticulatae, Aucklandia Root, Cyperus, Galangal, and Submature Bitter Orange. I prescribed Minor Chest Bind Decoction, which consisted of only three ingredients: Pinellia, Coptis Rhizome, and whole Trichosanthis Fruit. After taking five doses consecutively, the pain subsided, and as the tongue coating cleared, he gradually resumed eating. Since then, whenever the condition recurred, he would take two or three doses of this formula, and the symptoms would be relieved. Many other patients with stomachache who did not respond to other treatments also recovered after switching to this formula. As a result, it became widely known as the "Three-Ingredient Stomachache Formula."