The causes of bloating and lack of appetite are both physiologic and pathologic. Physiological causes include overeating, eating greasy food, etc. Pathological causes include intestinal flora imbalance, functional dyspepsia, gastroenteritis, cholecystitis, hepatitis, digestive tract tumors and so on. 1. Physiological reasons: eating too much, eating greasy food, etc. can lead to gastrointestinal tract to increase the burden of digestion, abdominal distension, loss of appetite and other symptoms. With the prolongation of fasting time, the symptoms can disappear gradually. 2. Pathological causes: such as intestinal flora imbalance, functional dyspepsia, etc. can affect the gastrointestinal digestion and absorption function decline, thus appearing bloating, loss of appetite and other symptoms; such as gastroenteritis can also have acid reflux, abdominal pain, diarrhea, etc.; such as cholecystitis can also be anorexia greasy, fever, etc.; such as hepatitis can be discomfort in the liver area, jaundice, etc.; such as gastrointestinal tract tumors can be fatigue, vomiting blood, black stools and other symptoms. For the causes of bloating and lack of appetite, it is recommended to consult a doctor.