Some patients come to me and tell me, “Doctor, we want twins, can we use some ovulation drugs to grow more eggs? There are two types of twins depending on the cause of formation: monozygotic twins, formed by the division of a single fertilized egg, and dizygotic twins, formed by the fertilization of two eggs separately. In the natural state, the incidence of twins is very low, about 1%. The application of ovulation-promoting drugs may improve the twin pregnancy rate to a certain extent, but an average healthy woman ovulates one egg per month, and the artificial use of ovulation-promoting drugs, which induce the ovaries to ovulate more, especially in the absence of medical tests, may lead to some serious consequences, such as ovarian hyperstimulation syndrome, ascites, pleural fluid, dizziness, nausea, liver and kidney functional impairment, etc. If the necessary measures are not taken, it can be very dangerous for both mother and child. Therefore, women with regular menstruation and normal ovulation can ovulate naturally, and ovulation-promoting drugs should be used carefully under the guidance of a doctor.