Lack of appetite may be caused by pregnancy, but it may also be caused by other reasons such as anorexia and chronic gastritis. 1. Pregnancy: After pregnancy, due to increased levels of chorionic gonadotropin in the body, gastrointestinal power peristalsis is reduced, pregnant women in the first trimester of pregnancy will be anorexia, nausea and vomiting, frequent urination, loss of appetite, gastrointestinal flatulence, dizziness, fatigue and other early pregnancy reactions, so pregnant women will appear to have a lack of appetite for food. This is a normal physiological phenomenon and does not require measures to treat. 2. Anorexia: The cause of anorexia is still unclear, and it is considered to be related to heredity, personality change and shock. The patient will have refusal to eat, fullness, lethargy, partiality, nausea and vomiting, and so on, and thus the patient will show that he has no appetite for food. 3. Chronic gastritis: chronic gastritis is considered to be caused by Helicobacter pylori infection, abnormal immune function, and taking non-steroidal anti-inflammatory drugs such as aspirin. The patient will be manifested as epigastric fullness, epigastric pain, loss of appetite, belching, acid reflux, and so on, so the patient will have no appetite for food. 4. Other: patients who have no appetite are also considered to be caused by hepatitis, gastric ulcer, dyspepsia, gastric cancer and other diseases. If pregnancy is the cause of lack of appetite, you can not take measures to treat, if it is a disease that causes patients to have no appetite, you need to consult a doctor in a timely manner, you need to follow the doctor’s instructions to choose the appropriate measures for treatment.