In the early stage of pregnancy (about six weeks after menopause), the chorionic gonadotropin (HCG) increases in the body of pregnant women, and the secretion of gastric acid decreases and the gastric emptying time is prolonged, resulting in a series of reactions such as dizziness and weakness, loss of appetite, acidic food or aversion to greasy food and nausea, morning sickness, etc., which are collectively referred to as pregnancy reactions. These symptoms generally do not require special treatment, and after 12 weeks of pregnancy, with the decline of HCG levels in the body, the symptoms mostly disappear naturally appetite to return to normal. However, it is important to remind pregnant women that not all vomiting is a reaction to early pregnancy, and sometimes they need to go to the hospital to identify some medical and surgical diseases, and of course there are some pregnant women who do not have pregnancy reactions. Generally speaking, in the early stage of pregnancy, because the embryo is small and growing slowly, it does not need much nutrition, so mild pregnancy reactions do not affect the pregnant woman and the fetus. However, severe pregnancy reactions, which last for a long time, may bring adverse effects to the health of the pregnant woman and the growth and development of the fetus. As the fetus grows up, it needs more and more nutrition, and severe pregnancy reactions will not allow the pregnant woman to take in enough nutrition, and the mother will only use her own body’s stored protein and fat to supplement the needs of the fetus, resulting in weight loss, emaciation and reduced resistance. If the reaction is particularly severe, the life of the pregnant woman and the fetus may be threatened by dehydration or acidosis. In order to reduce pregnancy reactions, the following points should be noted. Firstly, under the care of relatives and medical staff, pregnant women should take proper rest, relieve their worries and increase their confidence in overcoming pregnancy reactions. Secondly, don’t avoid eating, eat small amount of meals, avoid fasting, eat light food, try to eat some favorite, nutritious and easy to digest food, don’t eat too salty, greasy or special smelling food; cookies, bread and soda bread can reduce the discomfort of pregnancy vomiting. After eating dry snacks, you should drink water after an hour. Pregnant women who vomit frequently can take sedative and antiemetic drugs under the guidance of doctors, and it is better not to take random drugs by themselves to avoid adverse effects on the fetus. Keep the indoor air fresh, open the windows often, and go to places with bad odors less often. If you have a low amount of food, to avoid electrolyte disorders, pregnant women can drink their own sugar saline at home. If the pregnancy reaction is too severe, you may also need rehydration treatment in the hospital to maintain the pregnant woman’s need for protein, water and minerals, to prevent dehydration and acidosis. When the pregnancy reaction decreases, you should eat actively to ensure the nutrition of the pregnant woman and the normal development of the fetus.