How much menstrual flow is considered normal?

Patient's question:

No

Doctor's answer:

Hello, the menstrual cycle of a typical woman is 28-30 days, but some people have their period every 40 days. However, as long as there is regularity, it is considered normal. Additionally, menstruation is easily affected by various factors, so it is also normal for it to be 3-5 days early or delayed.