In general, early pregnancy reactions will appear around 6 weeks after menopause and will disappear on their own after 12 weeks. However, the time of appearance and disappearance of early pregnancy reactions varies from person to person due to their individual constitution. In some people, early pregnancy reactions may not be obvious during pregnancy, or they may continue throughout pregnancy. The causes of early pregnancy reactions are not fully understood and may be related to the increase of estrogen, increase of human chorionic gonadotropin and vitamin B6 deficiency in pregnant women in early pregnancy. At the same time, changes in the mental state of pregnant women and irritating odors can cause early pregnancy reactions such as dizziness, weakness, nausea, vomiting, drowsiness, breast swelling and pain, loss of appetite, preference for acid or aversion to greasy food, etc. However, these are normal physiological phenomena and pregnant women need not be too nervous and upset. Some pregnant women with mild early pregnancy reactions may only feel breast swelling and pain, weakness and discomfort, and slightly affect eating, without much nausea and vomiting. Pregnant women are advised to keep a good attitude and slowly adapt to the various discomforts of pregnancy, pay attention to a light diet and avoid stimulating foods. If the early pregnancy reaction is serious and has obviously affected eating or serious physical discomfort, it is recommended to supplement nutrition and fluids through infusion methods under the guidance of a doctor to avoid poor nutritional intake, which may affect maternal health and fetal development.