How long is a normal menstrual cycle?

Patient's question:

Please ask if my period came on October 1st and then came again from October 30th to November 3rd. Is this normal?

Doctor's answer:

According to individual differences, the menstrual cycle is not the same for everyone. Some may have cycles as short as 20 days, while others may have cycles as long as 36 days, and both are considered normal. According to relevant surveys and statistics, only about 10% of respondents actually have their menstruation every 28 to 30 days. As long as the interval between each menstrual cycle is consistent, it is considered normal. Irregular early or delayed menstruation is abnormal and may be a symptom of some gynecological disease.
A regular menstrual cycle generally has an interval of at least 20 days or more than 45 days between two menstrual periods. The duration of a normal menstrual period is 2 to 7 days, with most lasting 3 to 5 days. The average amount of blood loss is about 50 milliliters, but it can range from as little as 20 milliliters to as much as 100 milliliters. Menstrual blood is dark red because it contains fibrinolysin, which prevents blood from clotting. When bleeding is heavy, there may be a lack of fibrinolysin, leading to the formation of blood clots. If the menstrual period lasts too long or the amount of blood flow is too much or too little, it is considered abnormal and should be diagnosed and treated.

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