Period blood ranges from bright red to dark red, brown, and even black over the course of a single cycle, and all of those colors are normal. What you see on your pad, tampon, or in the toilet changes depending on how fast the blood is flowing and how long it sat in your uterus before leaving your body. The total amount lost during one period is usually about 60 milliliters, or just under 3 ounces, spread across several days.
What Each Color Means
The color of your period blood is mostly a reflection of timing and flow speed. Fresh blood that’s moving quickly through your body comes out bright red, which is why the heaviest days of your period tend to look the most vivid. As your flow slows down, gravity keeps blood sitting in the uterus a bit longer. It darkens to a deep red because it’s had some time in the body, but not enough to fully oxidize.
Brown blood is simply old blood. When blood sits in the uterus or vaginal canal long enough, it reacts with oxygen and turns brown, the same way a cut on your skin darkens as it heals. You’ll typically notice brown blood at the very beginning of your period, when leftover blood from the previous cycle finally makes its way out, or at the tail end when flow is lightest.
Black blood works the same way. It’s not a sign of something dangerous on its own. It just means the blood lingered even longer before leaving your body, usually during the low-flow days at the start or end of your period.
Pink blood tends to show up on the first day or so. At that point, fresh red blood mixes with the clear or milky vaginal discharge your body naturally produces, diluting the color. Very light periods can also look pinkish throughout.
Orange and Gray: Colors Worth Watching
Orange discharge can be harmless. Toward the end of your period, menstrual fluid sometimes mixes with cervical fluid, or the blood oxidizes in a way that gives it an orange tint. Orange-tinged spotting can also occur during implantation, when a fertilized egg attaches to the uterine wall early in pregnancy.
That said, orange discharge is also associated with infections like trichomoniasis and bacterial vaginosis (BV). If the color comes with a strong fishy smell, itching, or burning, it’s worth getting checked. Gray or grayish-white discharge is more clearly a warning sign. It’s one of the hallmark symptoms of BV and isn’t part of a normal menstrual cycle.
Texture and Consistency
Period blood isn’t pure blood. It’s a mix of blood, uterine lining tissue, cervical mucus, and vaginal secretions. That’s why the texture can shift from thin and watery to thick and sticky, sometimes within the same day. On your heaviest days, when blood is flowing fast, it tends to look thinner and more liquid. As your period tapers off and flow slows, the fluid thickens because it has more time to collect tissue and mucus before leaving your body.
Stringy or gel-like clumps are common and usually just pieces of uterine lining. Small clots are also entirely normal. Your body releases natural anticoagulants to keep menstrual blood flowing smoothly, but on heavier days, the blood can flow faster than those anticoagulants can work, leading to visible clots.
When Clots Are Too Large
The general threshold for concerning clots is the size of a quarter. Passing clots that large or larger on a regular basis is one of the signs of heavy menstrual bleeding, along with regularly losing more than 80 milliliters (about 2.7 ounces) per cycle. Other signs include soaking through a pad or tampon every hour for several hours in a row, or needing to change protection during the night.
Heavy periods aren’t just inconvenient. Over time, they can lead to iron-deficiency anemia, leaving you exhausted and short of breath. Several conditions can cause unusually heavy flow, including uterine fibroids, polyps, and adenomyosis (where uterine lining tissue grows into the muscular wall of the uterus, making periods heavier and more painful). PCOS can cause the opposite problem: the uterine lining builds up but doesn’t shed on a regular schedule, leading to light or missed periods with brown spotting in between.
What a Normal Smell Is
Period blood has a slight metallic smell, like copper pennies. That comes from the iron in the blood itself. You might also notice a faintly sour or tangy scent, which reflects the natural acidity of vaginal bacteria. Neither of these is cause for concern.
A strong, fishy odor is different. That smell, especially when it persists for several days or gets stronger after sex, is the classic sign of bacterial vaginosis. Trichomoniasis can produce a similar fishy or musty odor. Both infections are treatable, but they won’t resolve on their own.
Changes That Are Normal Over Time
Your period doesn’t look the same every month, and it won’t look the same across different life stages. Hormonal shifts during perimenopause commonly change the color, texture, and frequency of your flow, including more brown spotting between periods. Starting or switching hormonal birth control can lighten your period and shift its color toward pink or brown. After giving birth, postpartum bleeding (lochia) starts out heavy and dark red for the first few days, then gradually transitions to pinkish or brown over four to six weeks.
The most useful habit is knowing your own baseline. When you understand what your typical cycle looks like in color, volume, and texture, it becomes much easier to spot a meaningful change rather than worrying about normal variation.