After the fourth or fifth month of pregnancy, many mothers-to-be begin to be prone to chest tightness, shortness of breath, and in some cases, blackness and sudden fainting, and this phenomenon is often not directly related to your good or bad health before pregnancy. This is a common phenomenon and there is no need to worry too much, but it is important to pay attention to the following several common causes of fainting during pregnancy. Once the situation of fainting occurs, the first thing that the seven aunts and mothers-in-law will advise you not to go to work, it is best to lie at home and do not move, and then you will be told that it is likely that the nutrition is not enough, resulting in anemia, you need to hurry to eat more good, more nutrition. If you really listen to the seven aunts and mothers-in-law, the situation may be worse. The more you lie in bed every day without moving, the more tired you will be, the more tired you will want to sleep, the easier it is for your muscles to atrophy, and the more you will get up and faint easily. Anemia is common during pregnancy, but in most cases it is not so low that it often makes you faint; anemia is only a secondary cause that makes you prone to fainting. Postural hypotension In mid to late pregnancy, the uterus gradually increases in size and the body experiences a readjustment of blood distribution, giving priority to securing the blood supply to the uterus. As a result, mothers-to-be will be prone to temporary ischemia and hypoxia of the brain due to the change in body position, leading to fainting. For middle-aged and elderly people with high blood pressure, there is a so-called “three 5 minutes” to prevent cerebrovascular accidents, which mothers-to-be who are prone to fainting can refer to, but they usually don’t need “5 minutes”, usually 1-2 minutes is enough. ”Wake up and stay in bed for 1-5 minutes,” “Sit in bed for 1-5 minutes,” “Sit on the edge of the bed for 1-5 minutes,” and then get up and move around. In addition to getting up after lying in bed for a long time, you should also pay attention to the change of position in other situations, such as when you get up after sitting for a long time. Hypoglycemia After pregnancy, the metabolic rate of the mother-to-be will generally increase, and some mothers-to-be will be prone to having trouble eating or being hungry easily. If your doctor tells you to control your weight, just bear it, this will easily lead to hypoglycemia, which will also lead to fainting. The solution is to control the total amount of food, eat less and more often, and shorten the interval of fasting. There are also a few mothers-to-be who have neither a change in body position nor anemia, and have just eaten, but they still suddenly lose their breath, black out and faint. This kind of syncope for which no cause can be found may be neurological and cannot be identified, also known as idiopathic, or syncope of unknown cause. Regardless of the type of fainting during pregnancy, most of them are physiological, most of them are not problematic, and there is no major effect on the baby. After fainting, do not help her up immediately, let her lie flat for a while, she will recover soon. For mothers-to-be who faint frequently, in addition to the targeted treatment mentioned above, it is best to have someone around constantly to avoid secondary accidents.