The main causes of stomach fullness and discomfort include improper diet, stomach diseases, gastrointestinal dysfunction and so on. 1. Improper diet: Eating too much greasy food such as cake, fried chicken, etc. or overeating can cause indigestion, resulting in a full and uncomfortable stomach. 2. Gastric diseases: gastritis, gastric ulcer and other gastric diseases can cause gastric insufficiency, which makes it difficult to further digest food, and the accumulation of food in the stomach can cause gastric distension and other discomforts, which can be accompanied by nausea, vomiting, abdominal pain, diarrhea and other symptoms. 3. Gastrointestinal dysfunction: Under the effect of mental, emotional and other factors, the secretion and motor function of the stomach is dysregulated, resulting in gastrointestinal dysfunction, food can not be digested and absorbed properly, resulting in symptoms such as bloating. There may be other reasons for stomach bloating and discomfort, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.