6 Things Your Period Blood Color Tells You About Your Health

Your period may show up every month and annoy you with the cramps, bloating, and fatigue that come along with it, but it deserves a little respect. Your monthly flow can actually provide a lot of insight into your overall health. For instance, if you’re struggling with irregular periods, that’s a sign you may be dealing with a thyroid problem, polycystic ovary syndrome, or a hormone imbalance, or that you’re underweight. And if it doesn’t show up at all, well, you might want to try a pregnancy test.

The color of your period blood may also provide some insights into what else is going on inside your body. It can come in a rainbow of shades from pink and whitish to bright red and even dark brown. Here, we explore what each period blood color might mean—and let you know when it’s time to call your doctor.

IF IT’S PINKISH…

You may have low estrogen levels, especially if the pink blood is accompanied by a lighter-than-usual flow, or if you’re an avid runner, says New York-based functional medicine nurse practitioner Margaret Romero. Studies have found that excessive exercise can lower estrogen levels, which can subsequently mess with your period, sometimes causing it to disappear altogether. (It’s not uncommon for female professional athletes to stop ovulating.)

While this may not seem like a big deal (who hasn’t fantasized about never having to deal with a period at least once or twice?), low estrogen levels can increase your risk of osteoporosis if left untreated. So if you’ve recently started training for a marathon, have started working out for the first time in your life, or have upped the intensity of your workouts and you notice that your periods are suddenly lighter in color and flow or less frequent, talk to your doctor.