There are more reasons for pregnant women to black out and faint quickly, such as anemia, malnutrition, hypoglycemia, hypotension, etc. Targeted treatment needs to be taken after clarifying the cause. A common cause: 1, anemia: pregnant women in the process of pregnancy, peripheral blood red blood cells, hemoglobin relative or absolute reduction, can not meet the physiological function needs. This is usually due to insufficient intake of iron, folic acid, vitamin B12 and other hematopoietic raw materials or absorption disorders resulting in reduced hemoglobin synthesis, combined with acute and chronic blood loss resulting in excessive loss of hemoglobin, etc. In addition to blackness and fainting, it may also be accompanied by dizziness, panic, shortness of breath, general weakness and other symptoms; 2, malnutrition: after pregnancy, in addition to ensuring the maintenance of their own body metabolism required nutrients, women also need to If protein, fat, carbohydrate intake is lacking, resulting in malnutrition, there will be symptoms of dizziness and fainting; 3, hypoglycemia: during pregnancy, blood sugar will be lower than during non-pregnancy, because the hormones secreted by the placenta will have a resistance effect on insulin, so pregnant women are prone to hypoglycemia, when pregnant women may have dizziness and blackness; 4, hypotension: after pregnancy, blood pressure will be lower than during pregnancy. Low blood pressure: after pregnancy, blood pressure will be lower than non-pregnancy, because the blood volume will increase after pregnancy, blood will be diluted, so there will be the phenomenon of low blood pressure, when the brain blood supply is insufficient, there will be blackness in front of the eyes fast fainting. Treatment: 1. If it is caused by anemia, the primary disease causing the anemia should be removed and iron, vitamin B12 and folic acid should be supplemented, and mild to moderate anemia can usually be recovered faster. If the anemia is severe, for example, hemoglobin ≤ 60g/L, blood transfusion therapy is needed; 2. If the anemia is caused by malnutrition, reasonable intake of protein, fat, carbohydrates, vitamins and minerals is needed, and a nutritionally balanced diet consisting of diverse foods should be consumed; 3. If the situation is more serious, hypoglycemic coma, should be promptly sent to the hospital intravenous glucose solution; 4, if it is caused by hypotension, generally after rest, drink water will get better. It is recommended to pay attention to proper exercise to increase the elasticity of blood vessels.