Mild nausea without appetite may be due to early pregnancy, indigestion, chronic gastritis and other reasons. 1. Early pregnancy: If a pregnant woman experiences delayed menstruation and has mild nausea and lack of appetite, it is considered that the patient may be suffering from early pregnancy reaction, and the increase of human chorionic gonadotropin in the body may lead to nausea and vomiting, and lack of appetite and other symptoms. 2. Indigestion: When the patient has indigestion, the food in the stomach can not be digested and absorbed properly, and the food is fermented abnormally in the stomach and intestines, which stimulates the gastrointestinal wall and causes the patient to have mild nausea and lack of appetite. 3. Chronic gastritis: when the patient has chronic gastritis, the gastric mucosa is damaged, resulting in decreased gastric function, gastrointestinal peristalsis, which will also cause the patient to experience mild nausea and lack of appetite. 4. Anorexia: patients from the mental psychological fear of eating lead to obesity, boredom eating, excessive dieting, etc. will gradually trigger anorexia, every time you see food, especially greasy, fatty food will appear nausea without appetite. 5. Liver function damage: Liver function damage due to various reasons, the function of the liver is reduced, the function of toxin removal is also reduced, the alanine aminotransferase appears to be elevated, which causes nausea, loss of appetite, fatigue and other symptoms. 6. Renal insufficiency: Renal insufficiency due to chronic kidney disease can cause nausea, vomiting, loss of appetite and other digestive symptoms. If the patient has mild nausea and loss of appetite, it is best to go to the hospital for examination, to clarify the cause of the disease, and to treat the symptoms.