Most pregnant women experience vomiting at the end of the third to fourth month of pregnancy, but a small number of pregnant women experience persistent vomiting throughout their pregnancy, and some pregnant women experience no vomiting throughout their pregnancy. Pregnancy sickness is a common early pregnancy reaction, mainly due to increased hormone levels in the body. Most pregnant women experience vomiting in the first month of pregnancy, and it usually decreases or ends after 3 to 4 months of pregnancy. However, the specific end time of the vomiting needs to be judged according to the physical condition of each pregnant woman, and there are a small number of pregnant women who will not end the vomiting during the whole pregnancy. In addition, there are some pregnant women who do not experience pregnancy sickness during the entire pregnancy. It is recommended that pregnant women need to eat small, frequent meals, and for those with severe vomiting, vitamin B6 can be used to alleviate the symptoms as prescribed by the doctor. If a pregnant woman is dehydrated, she can be given glucose solution or sodium chloride solution intravenously to replenish water or electrolytes under a doctor’s supervision.