Menstruation is a physiological change unique to women, which, in addition to maintaining female characteristics and reproductive functions, often affects the bleeding and clotting mechanisms of human blood. According to studies, platelets change significantly during menstruation, often decreasing on the first day of menstruation and only rising back to their original number on the third or fourth day. During menstruation, the human endometrium can release more tissue-activating substances that can activate fibrinolytic enzymes in the blood into fibrinolytic enzymes with anticoagulant effects, which increase the body’s tendency to bleed. Therefore, surgery during the menstrual period may cause more bleeding. Moreover, due to the endocrine imbalance in women’s body during this period, they are more prone than usual to physical fatigue and swelling, mood swings, and the body’s resistance to pathogenic bacteria is also significantly lower than normal, so reluctantly performing surgery during menstruation not only has poor psychological tolerance to surgery, but also has poor resistance to infection, which can easily lead to serious infection. However, in order to have the surgery as soon as possible, or when the schedule is not open, some women conceal their menstrual flow from the doctor or refuse to listen to the doctor’s advice and insist on having the surgery during their menstrual period, which results in more bleeding during the surgery and even the formation of hematoma in serious cases, causing the surgeon to have difficulty in judging the morphology, and prolonging the recovery time and increasing the chance of infection after the surgery, adding unnecessary trouble and pain to themselves. Surgery should be avoided during the physiological period Therefore, if there are no special circumstances, cosmetic surgery that can be performed at a completely optional date should be avoided during the menstrual period, especially for surgeries that are extensive and take a long time to perform. It is best to schedule the surgery after the menstrual period, as this will not only result in less bleeding and a clearer surgical field, but also make it more convenient for the surgeon to operate, improve surgical precision and increase the success rate of the cosmetic surgery, and the chances of hematoma, infection and other complications will be greatly reduced. This will not only lead to faster recovery after surgery, but also facilitate better cosmetic results. More than one person has been forced to return or have their surgery rescheduled because they were tired and nervous, resulting in an earlier than expected period and “their period came with them.