Normal period blood ranges from pink to bright red to dark brown, and it typically gets darker as your period progresses. This color shift happens because of a simple chemical process: blood that sits in the uterus longer reacts with oxygen and darkens, just like a cut on your skin turns from red to brown as it heals. Most people will see several different shades during a single cycle, and that variation is completely normal.
How Color Changes Day by Day
Your period follows a fairly predictable color pattern from start to finish. On the first day or so, you’ll often notice pink-tinged blood. This happens because the fresh blood mixes with clear or milky cervical fluid as it leaves your body, diluting the red color into a lighter shade.
Within a day or two, the flow picks up and the blood turns bright red. This is the hallmark of fresh, steady bleeding and usually coincides with your heaviest days. As flow starts to slow in the middle of your period, blood spends more time pooled in the uterus before being shed. That extra time allows oxidation to set in, turning the color from bright red to a deeper, darker red.
By the last day or two, most people see brown or even very dark brown blood. This is simply the oldest blood clearing out. It’s been sitting in the uterus the longest and has oxidized the most. Think of it as the body’s cleanup phase. Some people also see brown spotting for a day after their period officially ends, which is just the last traces working their way out.
What Each Color Means
Pink
Pink blood at the start or end of a period is normal and results from a small amount of blood mixing with cervical fluid. Outside of your period, though, pink spotting can have other explanations. About 5% of people experience spotting around ovulation, which often looks pink because it blends with the clear, watery fluid your body produces at that time. Low estrogen levels can also cause the uterine lining to shed irregularly, producing pink spotting at unexpected points in your cycle. Starting or switching hormonal birth control is another common trigger, sometimes called breakthrough bleeding.
Pink spotting roughly 10 to 14 days after conception can be an early sign of pregnancy, caused by a fertilized egg embedding in the uterine lining. This implantation bleeding is typically very light and short-lived.
Bright Red
Bright red means the blood is fresh and flowing steadily. It’s the most common color during the heaviest days of your period, usually days two through four. There’s nothing concerning about bright red blood on its own. If bright red bleeding continues heavily for more than seven days, or you’re soaking through a pad or tampon in three hours or less, that pattern points to unusually heavy periods worth tracking.
Dark Red to Brown
Dark red and brown are both signs of older blood that has had time to oxidize. You’ll typically see dark red in the middle of your period and brown toward the end. Brown blood can also appear right at the start if a small amount of blood from the previous cycle lingered in the uterus. None of these shades signal a problem.
Black
Black period blood looks alarming, but it’s usually just brown blood that has oxidized even further. It commonly shows up at the very beginning of a period, when the uterine lining sheds slowly and pushes out blood that’s been sitting for a while, or at the very end as the last remnants clear out. In rare cases, consistently black or very dark blood with severe cramping and bloating could indicate a blockage slowing the flow, such as fibroids, polyps, or a narrowing of the cervical opening. A condition called hematometra, where blood becomes trapped in the uterus, can cause these symptoms.
Colors That Aren’t Typical
Orange
Orange discharge during or between periods is not part of the normal color spectrum. It can indicate bacterial vaginosis, a common vaginal imbalance that isn’t sexually transmitted but can increase your risk of contracting an STI. It’s also associated with trichomoniasis, a parasitic STI. If you notice orange-tinted discharge, especially with itching, a strong odor, or pain, it’s worth getting tested.
Gray
Gray discharge is the most clear-cut warning sign. It’s strongly associated with bacterial vaginosis and sometimes with other infections. Gray tissue mixed with bleeding during pregnancy can indicate a miscarriage. This color never falls within the normal range and always warrants a medical evaluation.
Clots, Texture, and Flow
Period blood isn’t just liquid. It contains fragments of uterine lining, cervical mucus, and sometimes clots, giving it a thicker, more varied texture than blood from a cut. Small clots, especially on heavier days, are normal. The general threshold clinicians use is clots larger than about one inch (2.5 cm) in diameter, roughly the size of a quarter. Passing clots that size or larger regularly suggests heavy menstrual bleeding that may need evaluation.
A normal period lasts seven days or fewer, and most people use three to six pads or tampons per day during active flow. If you’re consistently exceeding those ranges, or if your period arrives on an unpredictable schedule with highly variable flow, tracking the pattern gives you useful information to share with a healthcare provider. The American College of Obstetricians and Gynecologists considers the menstrual cycle a vital sign, meaning changes in your cycle can reflect broader shifts in your health.
What Actually Warrants Attention
Color alone rarely signals a problem. The combination of color with other symptoms is what matters. A foul or fishy odor alongside unusual colors like orange or gray points toward infection. Pain that doesn’t respond to over-the-counter options like ibuprofen, or pelvic pain that occurs outside your period entirely, can indicate conditions like endometriosis, fibroids, or pelvic inflammatory disease. Bleeding that soaks through a pad or tampon every three hours or less, or periods stretching well beyond seven days, falls outside the normal range regardless of what color the blood is.
The most reassuring takeaway is that the pink-to-red-to-brown progression most people experience is exactly what healthy menstrual blood looks like. Your period color is a reflection of timing and flow speed, not a report card on your health. As long as you’re not seeing gray, orange, or persistent black blood paired with pain, the rainbow of reds and browns in your cycle is your body working as expected.