Nausea and lack of appetite may be caused by early pregnancy reaction, or it may be caused by other reasons such as chronic gastritis, chronic hepatitis B, and viral hepatitis A. 1. Early pregnancy reaction: Early pregnancy reaction may be caused by increased levels of estrogen or progesterone in the body, pregnant women will experience nausea and vomiting, fatigue, dizziness, anorexia, loss of appetite, frequent urination and other manifestations. 2. Chronic gastritis: chronic gastritis is considered to be caused by Helicobacter pylori infection and autoimmune factors. Patients will not only show loss of appetite, nausea, but also epigastric pain, postprandial fullness and other symptoms. 3. Chronic hepatitis B: chronic hepatitis B may be caused by hepatitis B virus infection, the patient will have a loss of appetite, anorexia, nausea and other manifestations, as well as abdominal distension, yellow urine, pain in the liver area and other uncomfortable symptoms. 4. Other: patients with nausea and lack of appetite may also be caused by viral hepatitis A, intestinal dysbiosis, reflux esophagitis and so on. For the exclusion of early pregnancy reaction caused by nausea without appetite, the patient needs to consult a doctor in a timely manner, the doctor will choose the appropriate measures to treat the patient’s condition.