The term “menstruation” does not refer to a month of menstruation. Both menstruation and menstruation are folk expressions, and menstruation usually refers to the onset of menstruation, which is not a term used in modern medicine, but is a traditional Chinese custom. The term “menstruation” is similar to the clinical term for a period of time after childbirth when the blood is expelled from the body and the body begins to recover, but it does not mean that menstruation occurs for a month after childbirth. It is not necessarily menstrual bleeding, but a certain amount of residual blood in the uterus that is discharged from the vagina during the menstrual period, and the discharged blood is often darker and more abundant for a period of time, and gradually becomes lighter and less abundant over time. This condition usually lasts for about a month, so it is often referred to as the menstrual period, which is different from the menstrual period. The menstrual period is usually the period when a woman starts ovulating again after she gets out of pregnancy, which causes the endometrium to flake off regularly. The time it takes for the menstrual period to resume varies depending on the woman’s own body condition; some women resume regular ovulation a month after delivery, while others may take several months. If a woman has a lot of blood coming out of her uterus for a long time after delivery, it is recommended that she go to a regular hospital for a timely examination to confirm if there is any other disease causing vaginal bleeding so as not to delay the condition.