Period blood color changes throughout your cycle due to how quickly blood flows and how long it stays in your uterus. Common period blood colors include brown (at the start or end of your period), ...

Bright red period blood is common at the start of your period and indicates that blood has passed through your vagina quickly ...

The color of period blood can vary from bright red to dark brown or even black, and these changes are usually a natural part ...

In fact, last year the American College of Obstetricians and Gynecologists published a report recommending that it be viewed as a vital sign the same way your blood pressure, pulse, and temperature ...