Why is my period blood brown on the first day?

Why is my period blood brown on the first day? If you notice brown period blood at the start or end of your period, it’s because the blood is older and took longer to leave your uterus. The uterine lining darkens the longer it takes to leave the body.

If you notice brown period blood at the start or end of your period, it’s because the blood is older and took longer to leave your uterus. The uterine lining darkens the longer it takes to leave the body.