Pregnancy vomiting usually appears in the fifth or sixth week of pregnancy and gradually disappears after the third trimester. General nausea and vomiting in early pregnancy is not considered a disease, but the attacks are really torturous. Currently, there is no accurate and convincing medical explanation for the phenomenon of pregnancy sickness, especially severe pregnancy sickness. However, some data suggest that severe pregnancy vomiting is mainly related to three aspects: 1, the rapid rise of hormones in the body of pregnant women; 2, the sense of smell becomes more sensitive during pregnancy; 3, the pregnant mother’s intestines become fragile and sensitive. And a Norwegian study reported that severe pregnancy sickness is also related to genetics, and that a mother who has a strong pregnancy reaction is three times more likely to have a daughter with this symptom when she becomes pregnant. The more severe the pregnancy sickness, the healthier the fetus? There is a legend that “the more severe the pregnancy vomiting, the healthier the baby will be”, so sometimes mothers have more than pregnancy vomiting, but the elders have a secret joy in their hearts, thinking that the baby will be born healthier. Is there any scientific basis for this statement? The answer is: no. There is no definite, unified answer to the question of why pregnancy vomiting occurs. There is also no scientific basis or assertion that severe pregnancy vomiting helps babies develop better, so this claim needs to be further studied. Not everyone has severe pregnancy vomiting. The reaction to pregnancy vomiting varies from person to person, and for some pregnant mothers, they have little or no reaction to pregnancy vomiting, which is most likely due to the low level of progesterone in their bodies. In fact, pregnancy vomiting is the reaction of each mom-to-be to her pregnancy, and people who are allergic are naturally prone to pregnancy vomiting during pregnancy, while there are many pregnant mothers who are physically strong and have no obvious reaction to pregnancy vomiting during pregnancy, so they pass through pregnancy with a big smile. As long as there are no symptoms of redness or unbearable pain, it is basically not a problem for the baby. The pregnant mother can have an ultrasound examination within the third month of pregnancy, then relax and pay attention to rest and diet. A few pregnant mothers have a particularly severe reaction to pregnancy vomiting, persistent vomiting, even can not eat, water, called severe pregnancy vomiting. In addition to food, there are also mucus foam and possibly bile or blood in the vomit. Due to frequent vomiting, the pregnant mother is in a state of dehydration. In rare cases of severe vomiting, it may also be an abnormal reaction to high hormone levels in the body, such as hyperemesis gravidarum. In addition, violent vomiting may cause imbalance of the body’s water-electrolyte balance, affect liver function, and in severe cases, dehydration or ketosis may occur, requiring hospitalization.