2023年4月22日 · The menstrual cycle is counted from the first day of one period to the first day of the next. The cycle isn't the same for everyone. Menstrual bleeding might happen every 21 to 35 days and last 2 to 7 days.

2022年12月9日 · A menstrual cycle begins when you get your period or menstruate. This is when you shed the lining of your uterus. This cycle is part of your reproductive system and prepares your body for a possible pregnancy.

Menstruation — aka having your period — is when blood and tissue from your uterus comes out of your vagina. It usually happens every month. Problems with your period? For more accurate abortion options, please enter your age and the first day of your last period. Your information is private and anonymous.

2023年4月21日 · Menstruation occurs when the lining of the uterus sheds, turning into blood. This blood then flows out of the body through the vagina. It is also known as a period. Periods …

2023年10月31日 · Menstruation occurs when the lining of the uterus sheds by breaking down and leaving the body as blood. Most periods last around three to seven days. What Is Menstruation? Menstruation is a natural part of life. Throughout the month, your uterus builds up its lining to support a possible pregnancy.

Triggered by falling progesterone levels, menstruation (a "period", in common parlance) is the cyclical shedding of the lining, and is a sign that pregnancy has not occurred. Each cycle occurs in phases based on events either in the ovary (ovarian cycle) or in the uterus (uterine cycle).

2023年3月13日 · Knowing the stages of the menstrual cycle can help put you in control of your body and empower you to know when to speak with a doctor.

2024年3月6日 · When it comes to periods, "normal" covers a lot of ground. Use the broad range of factors below as a guide. And remember: The only true normal is what's normal for you.

Menstruation is one part of a woman's cycle when the lining of the uterus (endometrium) is shed. This occurs throughout a woman's reproductive life. With each monthly cycle, the endometrium prepares itself to nourish a fetus. Increased levels of estrogen and …

2024年11月6日 · Menstruation, often referred to colloquially as a period, marks the shedding of the uterine lining, resulting in bleeding that typically lasts about five days. This phase begins on the first day of the cycle and is a clear indicator that fertilization has not taken place.