Suddenly bad appetite in 34 weeks of pregnancy may be a normal physiological manifestation of late pregnancy, or it may be caused by acute fatty liver in pregnancy, which needs timely treatment. 34 weeks pregnant women in late pregnancy, at this time due to fetal growth and development, the bottom of the uterus rises, can oppress the pregnant woman’s stomach, causing pregnant women stomach discomfort, can be manifested as decreased appetite, acid reflux, gastric distension, etc., this situation caused by the bad appetite is a normal physiological phenomenon, do not have to be treated in a special way. Pregnant women in the 34th week of pregnancy who suffer from acute fatty liver of pregnancy, mainly manifested as gastrointestinal symptoms, common for decreased appetite, nausea, vomiting, epigastric pain, etc., which can be accompanied by jaundice, coagulation function abnormalities, hepatic and renal failure, which can seriously jeopardize the life of the mother and child, and need timely treatment. Therefore, when 34 weeks pregnant women suddenly bad appetite should be timely medical care to clarify the cause of the abnormality as soon as possible treatment, so as not to delay the condition leading to adverse consequences.