The sudden appearance of dizziness, dizziness and sweating during pregnancy is usually due to early pregnancy reactions caused by changes in hormone levels, frequent vomiting and low food intake, resulting in dizziness, dizziness and sweating. It may also be caused by abnormal blood sugar or blood pressure, or if the pregnant woman is usually malnourished, resulting in anemia, this symptom may also occur easily. Usually seen in the following causes: a. Physiological factors hormone level changes, high hormone levels in the body can cause a series of gastrointestinal discomfort. Increased hormone levels will stimulate the smooth muscle of the gastrointestinal tract, and most pregnant women will experience nausea, vomiting, weakness, sleepiness and other early pregnancy reactions, which are normal physiological phenomena and will generally improve after 3 months. Second, pathological factors 1, blood sugar abnormalities: early vomiting of pregnant women is serious, blood sugar will be low, and cellular energy will be reduced, which will cause sweating, dizziness and weakness. It is necessary to replenish the sugar in time and eat less and more meals. If dizziness and weakness appear in the middle and late pregnancy, it may also be gestational diabetes, caused by high blood sugar, to go to the hospital to check blood sugar; 2. Blood pressure abnormalities: low or high blood pressure will lead to dizziness and dizziness. It may also be due to the formation of blood circulation with the placenta and fetus during pregnancy, resulting in a certain degree of decline in blood pressure in the body, when the flow of blood to the brain will be reduced, resulting in insufficient blood supply to the brain, resulting in sudden dizziness, dizziness, sweating; 3, anemia: early pregnancy, will be prone to pregnancy reaction, nausea, vomiting symptoms, will easily lead to nutrients can not be fully absorbed, resulting in malnutrition, may The phenomenon of anemia, resulting in dizziness, dizziness, sweating and other symptoms. At this time, pregnant women should eat more nutritious foods such as milk, lean meat and eggs. Pay attention to folic acid and iron supplements, and pay attention to rest and do not overexert yourself.