The time for pregnancy vomiting to be alleviated by infusion for a few days is uncertain, and needs to be judged according to the symptoms of the pregnant woman after the infusion treatment as well as the test results. Pregnancy vomiting is a relatively common symptom during pregnancy, may be related to chorionic gonadotropin, thyroid hormones, and maternal stress and anxiety, mainly manifested as nausea, vomiting, and in severe cases may even electrolyte disorders, ketoacidosis endangering the life of pregnant women. If the vomiting is relatively mild, the symptoms can be improved by eating a light diet, avoiding satiety, and diverting attention, etc. However, those with severe nausea and vomiting need to consult the doctor in time, complete the examination, such as urine routine, electrolytes, etc., and promptly replenish the fluids, vitamin B1 and B6, potassium supplementation, and appropriate antiemetic treatment with metoclopramide. Most of the patients after active treatment, nausea and vomiting and other symptoms improve, the electrolytes are normal, urine ketone body also gradually turn negative, the time ranges from a few days to a few weeks, but some patients do not have obvious improvement, or even need to terminate the pregnancy. In the case of severe vomiting in pregnancy, the prognosis is good in most cases after standardized treatment, so it is necessary to follow the doctor’s advice and active treatment.