Period blood can range from bright red to pink, dark red, brown, black, and even orange. Most of these colors are completely normal and reflect how quickly blood leaves your body and how much oxygen it’s been exposed to. A few colors, particularly orange and gray, can signal an infection worth getting checked out.
Bright Red Blood
Bright red blood is fresh blood that moved through your uterus and out of your body quickly. It hasn’t had time to react with oxygen, so it keeps that vivid red color. This is most common during the heaviest days of your period, typically days two and three, when your flow is at its fastest. If your entire period is bright red from start to finish, that simply means your flow stayed steady throughout.
Dark Red, Brown, and Black Blood
These three colors are all stages of the same process: oxidation. When blood sits in the uterus longer before leaving your body, it reacts with oxygen and gradually darkens. Fresh blood starts bright red, then shifts to dark red, then brown, and eventually black if it lingers long enough.
You’re most likely to see brown or black blood at the very beginning and very end of your period. Flow is slower on those days, so the blood has more time to oxidize before it exits. Brown spotting a day or two before your full flow starts is one of the most common period experiences, and black blood on your last day or two is equally routine. None of these darker shades indicate a problem on their own.
Pink Blood
Pink period blood happens when a small amount of blood mixes with cervical fluid, diluting the color. This is common at the start or end of your period when flow is light. You might also notice pink spotting around ovulation, when cervical fluid production increases and can mix with a small amount of blood. That type of mid-cycle spotting usually lasts only a day or two.
People going through perimenopause often see more pink blood than they used to. Lower estrogen levels change both the volume and color of menstrual flow. Anemia may also cause period blood to appear pink, though this connection isn’t well studied. If your periods are consistently very light and pink, and you’re also dealing with fatigue or dizziness, iron deficiency is worth considering.
Orange Blood
Orange discharge during your period is less common and deserves a closer look. Sometimes it’s simply blood mixing with cervical fluid in a way that creates an orange tint, which is harmless. But orange discharge can also indicate bacterial vaginosis (BV) or trichomoniasis, a common sexually transmitted infection caused by a parasite.
BV happens when the balance of bacteria in the vagina shifts. Trichomoniasis is passed through sexual contact. Together with yeast infections, these three conditions account for about 70% of all cases of abnormal vaginal discharge. If your orange discharge comes with a strong or unusual smell, itching, or burning, those are signs of infection rather than normal period variation.
Gray Discharge
Gray is the one color that’s never considered a normal part of your period. Gray or grayish-white discharge, especially if it has a fishy smell, is a hallmark of bacterial vaginosis. If you notice gray discharge mixed into your period blood or at any other point in your cycle, it’s worth getting tested. BV is easily treatable once identified.
What Clots and Texture Tell You
Color isn’t the only thing that varies. Period blood can be thin and watery, thick and syrupy, or contain clots. Small clots, especially on your heaviest days, are normal. Your body releases anticoagulants to keep menstrual blood flowing smoothly, but on heavy days it can’t always keep up, so clots form.
The threshold to watch for is clots the size of a quarter or larger. According to the CDC, passing clots that big is one of the markers of heavy menstrual bleeding, which can lead to iron deficiency over time if it happens regularly.
Period Color on Birth Control
If you’re on hormonal birth control, the bleeding you get during your placebo week isn’t technically a period. It’s withdrawal bleeding triggered by the drop in hormones when you stop taking active pills or remove a patch or ring. Because hormonal contraception prevents your uterine lining from thickening the way it normally would, withdrawal bleeding tends to be lighter and shorter than a natural period. The color often skews toward pink, light red, or brown rather than the deep red of a heavier natural flow.
Implantation Bleeding vs. a Period
If you’re trying to conceive or think you might be pregnant, color can help you distinguish between implantation bleeding and a true period. Implantation bleeding, which happens when a fertilized egg attaches to the uterine lining, is typically pink or brown. It’s very light, more like spotting than a flow, and resembles normal vaginal discharge more than menstrual blood. It shouldn’t soak through a pad.
If the blood is bright or dark red, heavy, or contains clots, it’s probably not implantation bleeding. Implantation spotting usually shows up about 10 to 14 days after conception, which can overlap with when you’d expect your period, making color and volume the most useful clues for telling them apart.
Color Changes After Childbirth
Postpartum bleeding, called lochia, follows a predictable color pattern over several weeks. In the first three to four days after delivery, the discharge is dark or bright red. From roughly day four through day twelve, it shifts to a pinkish brown and looks less like active bleeding. Starting around day twelve and lasting up to six weeks, the discharge becomes yellowish white as healing progresses. This color timeline holds whether you had a vaginal birth or a cesarean section, though the overall volume can vary.
When Color Actually Matters
Most period color changes are just your body doing its thing at different speeds. The colors that warrant attention are orange (if accompanied by odor or irritation), gray (which consistently points to infection), and persistently watery pink (if paired with symptoms of anemia like fatigue or shortness of breath). A sudden shift from your personal normal, like periods that were always bright red becoming consistently brown and light, can also reflect hormonal changes worth investigating, especially if it happens alongside other symptoms like irregular cycles or pelvic pain.