Menstrual Bleeding: Average Amount, Factors & What's Normal

On average, a woman loses between 20 and 60 milliliters of blood during a menstrual period. However, the amount can vary from woman to woman and from cycle to cycle. Some women may lose only a few milliliters, while others may lose more than 100 milliliters.

The amount of blood lost during menstruation is influenced by several factors, including:

* The length of the menstrual cycle. Women who have longer cycles tend to lose more blood than those with shorter cycles.

* The age of the woman. Women who are in their 20s and 30s typically lose more blood than women who are in their teens or 40s.

* The woman's overall health. Women who have certain medical conditions, such as anemia or thyroid problems, may lose more blood during menstruation.

* The use of certain medications. Some medications, such as blood thinners and oral contraceptives, can cause heavier menstrual bleeding.

If you are concerned about the amount of blood you are losing during menstruation, talk to your doctor. They can help determine if your bleeding is normal or if there is an underlying medical condition that needs to be treated.