# Period blood colour in perimenopause · Peri Signals > Source: https://perisignals.com/articles/what-are-the-different-types-of-period-blood-and-what-do-the-different-colors-signify Periods and bleeding ## Period blood colour in perimenopause Period blood is usually pink, bright red, dark red or brown, and the shade mostly shows how long the blood took to leave the body: the longer it stays in the womb, the darker it turns. Colour on its own tells a doctor very little. When the bleeding happens, how much there is and whether it comes with clots or pain matter far more, in perimenopause as at any age. By Nora Whitfield, updated 4 November 2026 ### What the different colours of period blood mean Cleveland Clinic's [guide to period blood colour](https://health.clevelandclinic.org/what-does-the-color-of-your-period-mean) explains the shades with one mechanism. Blood reacts with oxygen over time and gets darker, so dark blood is older blood that sat in the womb or vagina for longer, and bright blood is fresh. Over a typical period the colour moves from pink to red to dark red, and often ends in brown. #### Pink blood and pink spotting Pink usually shows up on the first day or so. Fresh blood mixes with the clear or milky discharge that comes before a period, and the mix looks pink. Very light bleeding can look pink too, which is why pink spotting is common in perimenopause, when some periods shrink to a day or two of light flow and some cycles bring spotting in between. #### Bright red blood Bright red is fresh blood that moved out quickly, usually in the early, heavier days of a period, when the womb contracts and pushes the lining out. Cleveland Clinic notes that mid-cycle spotting is often bright red as well. On its own the shade is ordinary. Where it appears in your cycle is what decides whether to report it, as the section on bright red bleeding below sets out. #### Dark red blood Dark red tends to come a few days in, once the first fresh blood has gone and older blood that pooled in the womb follows it. It can be thicker and carry small clots, because blood that stays in the womb can clump. Small clots are usually nothing to worry about, but clots that grow larger or more frequent than you are used to are worth taking to a doctor. Dark period blood in your 40s fits the same pattern as at 25, though heavier perimenopause periods can bring more of it. #### Brown blood Brown is the darkest and oldest blood, most often at the very end of a period as the last of it leaves. Mixed with discharge it can look dark brown, almost black. Brown period blood in perimenopause has the same cause. Light, slow bleeding gives the blood time to oxidise before it appears, so slow, light bleeding at the start or end of a period, or spotting in the middle of a cycle, is often brown rather than red. ### Why the colours can change in your 40s The colours themselves do not change in perimenopause. What changes is the bleeding that produces them. The [American College of Obstetricians and Gynecologists (ACOG)](https://www.acog.org/womens-health/faqs/perimenopausal-bleeding-and-bleeding-after-menopause) describes periods that come closer together or further apart, run heavier or lighter, or get skipped as the ovaries release an egg in some months and not in others. A period that drops to two light days can look mostly pink and brown. A heavier one can bring more bright red at the start and more dark red with clots later on. Our guide to [irregular periods in perimenopause](/articles/irregular-periods-perimenopause) covers these cycle changes in detail. If you have noticed more brown or dark blood than you used to, the likeliest explanation is lighter, slower flow. That is a reading of the colour, though. The doctor needs the dates and the amounts. ### What the colour cannot tell you Gynaecologists rarely ask about colour, and Cleveland Clinic says so directly: the shade does not tell them much about your reproductive health. The same guide lists what they do want to hear about, including spotting outside a period, bleeding after menopause, and a heavier or lighter flow than usual. Brown blood can come from an ordinary last day or from bleeding that needs looking into, and bright red can be a normal first day or bleeding after sex. The shade looks the same in both cases. So read the colour as a clue about timing and flow. It cannot rule a cause in or out, and a reassuring shade is no reason to skip an appointment for bleeding at the wrong time. ### Bright red bleeding when you are not on your period Fresh red blood outside your period is the colour question readers most often bring, and the answer turns on when it happens. ACOG lists bleeding or spotting between periods and bleeding after sex as not normal at any age, perimenopause included, which means a doctor should see it even when the likely cause is hormonal. The [NHS page on bleeding between periods or after sex](https://www.nhs.uk/symptoms/vaginal-bleeding-between-periods-or-after-sex/) advises a GP or sexual health clinic appointment, and an urgent GP appointment or a call to NHS 111 if you have recently missed a period and have unusual bleeding with pain in your tummy, because that can be an ectopic pregnancy. Pregnancy is still possible in perimenopause. If the bleeding came around when a period was due and was lighter than usual, our page on [implantation bleeding or perimenopause spotting](/articles/when-does-implantation-bleeding-occur) explains when a test gives a reliable answer. For mid-cycle bleeding more generally, including after sex, see [spotting between periods in perimenopause](/articles/spotting-between-periods-perimenopause). ### Bleeding to report whatever its colour These come from ACOG, the NHS and Cleveland Clinic, and none depends on the shade of the blood: * **Any bleeding after 12 months with no period,** pink, brown or red, however small. See [bleeding after menopause](/articles/bleeding-after-menopause) for why it is checked quickly. * **Soaking through a pad or tampon every hour for two hours or more.** Cleveland Clinic lists it as a sign of a flow that is too heavy, and ACOG says bleeding this heavy means calling your doctor or getting emergency care. * **Clots larger than about 2.5 cm,** roughly the size of a US quarter, or clots that appear when you never had them before. * **Periods heavier or longer than usual for you,** or bleeding that goes on for more than 7 days. Our article on [heavy periods and blood clots](/articles/heavy-periods-perimenopause) gives the measurable signs, and [bleeding for weeks](/articles/bleeding-for-weeks-perimenopause) covers a period that will not stop. * **Cycles shorter than 21 days** from the start of one period to the start of the next, which ACOG counts as not normal. * **Bleeding with severe cramping,** or pain that is worse than your usual period pain (see [period pain in perimenopause](/articles/period-cramps-perimenopause)). If you are not sure which of these fits, the [perimenopause bleeding checker](/articles/is-this-bleeding-normal-a-perimenopause-bleeding-checker) asks about timing, flow and how you feel, and sorts the answer into expected, worth an appointment, or worth calling about today. ### When the colour is in the discharge Some colours people search for, such as grey, green or orange, are usually about discharge rather than blood. The [NHS page on vaginal discharge](https://www.nhs.uk/symptoms/vaginal-discharge/) says a change in smell, colour or texture can be a sign of infection. It links a fishy smell to bacterial vaginosis and green, yellow or frothy discharge to trichomoniasis, and advises NHS 111 or a sexual health clinic rather than guessing. Brown or pink streaks in discharge mid-cycle count as spotting, and belong with the bleeding questions above. ### What to note down Colour is worth a word in your notes because it helps you and the doctor tell a period from spotting. Keep it alongside the details that carry more weight: * the date the bleeding started and stopped, and whether it was a period or spotting * how much: a few drops, enough for a liner, or pads and tampons changed every few hours * clots, and roughly how big * the colour, in your own words * what came before it, such as sex, a missed pill or a new medicine The [printable symptom diary and appointment checklist](/articles/printable-perimenopause-symptom-diary-and-appointment-checklist) has rows for flow and spotting, and the [cycle length calculator](/articles/perimenopause-cycle-length-calculator-is-your-cycle-changing) turns your start dates into cycle lengths, which tell a doctor more than any colour. ### My take I'd stop reading meaning into the shade. Brown at the end of a period, pink at the start and dark red with small clots in between are what period blood looks like, and lighter perimenopause periods simply show more of the darker end. I'd judge any bleeding by three things instead: when it came, how much there was, and whether it hurt. Blood that turns up mid-cycle, after sex or a year after the last period goes to a doctor whatever colour it is, and soaking a pad every hour gets a call the same day. ### Related reading Everything on cycle changes is gathered under [periods and bleeding](/topics/periods-and-bleeding), and [perimenopause symptoms and how to track them](/articles/perimenopause-symptoms) covers the rest of this stage. Written by Last checked 2026-11-04 --- [Peri Signals](/) Perimenopause symptoms, explained and tracked Plain answers on perimenopause symptoms for women 35 to 65: what is common, what to tell your doctor, and how to keep a useful symptom record. Some links on this page may earn us a commission. It never decides what we write about or recommend. © 2026 Peri Signals. Independent and reader-supported.