In the early stage of pregnancy, due to the change of hormone level in pregnant women, they may experience some uncomfortable symptoms, such as nausea, vomiting, backache and weakness. However, the reaction of pregnancy vomiting does not occur in everyone, but is usually influenced by the individual’s constitution and estrogen in the body. In addition, the degree of pregnancy vomiting and the time of its appearance vary according to the individual’s constitution. Usually, when a pregnant woman is less than one month pregnant, there is no obvious reaction. Most women experience vomiting after 6 weeks of pregnancy and the symptoms may last for up to 3 months, especially in the morning, within a few hours after waking up. The nausea and urge to vomit may also come on at any time and last throughout the day. In milder cases, the symptoms are usually characterized by a loss of appetite and occasional nausea or vomiting. Those with significant symptoms vomit severely and, because of their acute sense of smell, may induce pregnancy vomiting at any time of the day. Pregnancy vomiting can seriously affect the quality of life of pregnant women, and also increase the financial burden, causing certain impact on the family and society. Moreover, if a pregnant woman vomits severely, it may also have serious effects on the mother and the fetus, and this situation requires timely treatment.