A little heartburn in the stomach does not alert to three diseases. The appearance of this phenomenon may be related to dietary stimulation, gastritis, gastric ulcer and other digestive system diseases, etc., can be divided into physiological causes and pathological causes of two cases. 1. Physiological reasons: consuming more spicy and stimulating food, or drinking a lot of alcohol, will stimulate the gastrointestinal mucosa, exacerbate the secretion of gastric acid, and then appear a little bit of heartburn phenomenon. 2. Pathologic causes: (1) Functional dyspepsia: it can lead to the patient’s discomfort symptoms such as fullness, abdominal pain and burning sensation. (2) chronic gastritis: the main symptoms include epigastric discomfort, burning pain, nausea, belching, loss of appetite. (3) Gastric ulcer: the patient’s gastric mucosa is damaged to varying degrees, which can cause burning sensation, nausea, vomiting, indigestion and other symptoms. (4) Reflux disease: such as bile reflux gastritis, bile reflux into the upper gastrointestinal tract, which can also lead to the symptoms of burning sensation in the stomach. The causes of this condition are relatively complex and may not be related to disease factors. It is recommended that patients seek medical attention as soon as possible to confirm the cause of the condition.