Many women develop diabetes after pregnancy, which is caused by two factors: the hormones secreted by the placenta during pregnancy and the congenital deficiency of the glucose regulation mechanism of the pregnant mother’s body. The main reason why some people develop diabetes after pregnancy is due to two factors. One is that in normal people, pregnancy is a physiological process, but this physiological process will bring some burdens, and these burdens mainly originate from some hormones of the placenta. These hormones counteract the action of maternal insulin, making the insulin mother’s insulin ability to act reduced, which requires the mother to secrete more insulin to manage blood sugar. The other is that if the mother has some congenital deficiency and does not have the ability to compensate for her glucose regulation and secrete more insulin to manage blood glucose, she will be exposed to this problem and develop gestational diabetes. This is the result of a combination of the burden and her own potential deficiencies. This group is much more likely to develop diabetes after the birth of a child than the general population and should be very alert.