Menstruation is the most visible phase of the menstrual cycle and its beginning is used as the marker between cycles. The first day of menstrual bleeding is the date used for the last menstrual period …

Periods get lighter and shorter over time, or come when you don’t expect it. You may have spotting or cramping every once in a while until you stop getting your period, and sometimes even after it …

Dec 10, 2025 · Periods, also known as menstruation, occur when your uterus sheds its lining, causing blood and mucus to discharge from the vagina. 1 This usually occurs once a month if you are not …

Apr 22, 2023 · Your periods are less than 21 days or more than 35 days apart. You bleed between periods. You develop severe pain during your period. You suddenly get a fever and feel sick after …

Jan 11, 2026 · Periods usually start between age 11 and 14 and continue until menopause at about age 51. They usually last from three to five days. Besides bleeding from the vagina, you may have: …

Sep 4, 2025 · 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 …

Periods usually last about 5 days. But a period can be shorter or last longer.

Dec 9, 2022 · Most people have their period (bleed) for between three and seven days. Is a three-day period normal?

This free calculator estimates days in the future during which a person is expected to undergo their period, based on information of previous periods.

Find out about periods, including when they usually start and finish, period products, PMS, getting pregnant, and changes to your periods.