In most cases, pregnant women will have reactions around 40-42 days of pregnancy, which are mainly characterized by drowsiness, nausea, vomiting, dizziness and fatigue. Around 6 weeks of pregnancy, due to the elevation of chorionic gonadotropin leads to a decrease in gastric acid secretion, prolonged gastric emptying time, gastrointestinal tract dysfunction, etc., which often causes loss of appetite, nausea, vomiting, aversion to grease and other early pregnancy reactions. Around 8 weeks of pregnancy, the level of chorionic gonadotropin reaches its peak, and the early pregnancy reaction will be more obvious. Around 12 weeks after menopause, as the level of chorionic gonadotropin in the body decreases, the early pregnancy reaction is significantly reduced or disappears. When the pregnant woman has vomiting aggravation, more frequent vomiting, significant weight loss, decreased urine output, fine pulse, dry skin and other abnormalities, it is considered to be severe vomiting of pregnancy, and it is recommended to go to the obstetrics and gynecology department of the hospital in a timely manner for treatment. In addition, pregnant women should consume more easily digestible food and take vitamin supplements during the stage of early pregnancy reaction, and hydrate in time when the vomiting is severe or accompanied by dehydration.