}})
Key Takeaways
- Menstrual blood color varies from bright red to brown, black, orange, or even green.
- Color changes depend on flow speed, oxidation, hormonal shifts, or health conditions.
- Most color variations are normal, but gray, green, or persistent orange blood may signal infection.
- Clots smaller than a quarter are typical; larger clots or extreme pain warrant medical attention.
Period blood colour normally ranges from bright red at peak flow to dark red, brown, or black at the start and end of your cycle. Bright red is fresh, fast-flowing blood. Brown or black is older, oxidised blood and is usually harmless. Pink can appear with light flow or low estrogen. Orange, grey, or green period blood is uncommon and may point to a bacterial or sexually transmitted infection that needs medical review. Clots smaller than a rupee coin are normal on heavy days.
Period Blood Colour Chart at a Glance
| Colour | What It Usually Means | When It Appears | Concern Level |
|---|---|---|---|
| Bright red | Fresh, fast-flowing blood | Days 1 to 2, peak flow | Normal |
| Dark red / maroon | Slower flow, moderate oxidation | Days 2 to 3, mornings, evenings | Normal |
| Brown | Older, oxidised blood | Start or end of period | Normal |
| Black | Very oxidised, delayed shedding | Day 1 or tail end | Usually normal; review if persistent |
| Pink | Light flow mixed with cervical fluid | Spotting, day 1, ovulation | Usually normal; low estrogen possible |
| Orange | Red blood mixed with cervical mucus | Anytime | Review if foul odour or itching |
| Grey | Bacterial vaginosis or early miscarriage | Anytime | See a doctor promptly |
| Green | Bacterial or STI infection | Anytime | See a doctor promptly |
| Purple/deep burgundy | Slow flow, normal variant of dark red | Mid to late period | Normal |
Why Does Period Blood Change Colour?
The colour you see on your pad, tampon, or menstrual cup depends on three things: how fresh the blood is, how quickly it exits the uterus, and what it mixes with along the way. Fresh blood that leaves the body quickly stays bright red. Blood that sits longer inside the uterus reacts with oxygen, a process called oxidation, and turns darker with brown or black tones by the time it exits. Cervical mucus and vaginal fluid can thin or lighten the shade, shifting it toward pink or orange.
Hormones matter too. Estrogen thickens the uterine lining, which usually produces brighter and heavier flow. When estrogen dips, periods tend to look lighter and pinker. Progesterone shifts affect timing and consistency, which is why one cycle may look nothing like the next.
What Each Period Blood Colour Actually Means
Bright Red Period Blood
Bright red is fresh blood, seen on your heaviest days, typically days 1 and 2. Your uterus is actively contracting to shed its lining, so blood exits fast and has little time to oxidise. If bright red heavy flow lasts more than three days, or you soak through a pad every hour, that pattern deserves a check-up for possible fibroids, polyps, or hormonal imbalance.
Dark Red or Maroon Period Blood
Dark red and maroon shades are common in the middle to end of a period. Flow has slowed, so blood spends more time inside the uterus before exiting. It is not older or unhealthier, just less rushed. Many people also notice darker blood in the morning after lying down overnight, which is completely normal.
Brown Period Blood
Brown period blood is oxidised blood. It shows up most often at the very start of a period as leftover blood from the last cycle, or at the tail end as the final trickle takes longer to exit. Brown spotting a few days before your expected period can also indicate an early hormonal shift or, in some cases, implantation. It is rarely a concern on its own.
Black Period Blood
Black blood is the darkest form of oxidised blood. First-day black blood usually means residual tissue from the previous cycle. Occasional black blood is not dangerous. If it is paired with a foul smell, fever, severe cramps, or a missed tampon, see a doctor. A retained foreign object in the vagina can cause dark, smelly discharge and needs prompt attention.
Pink Period Blood
Pink appears when blood mixes with cervical fluid, most common on light-flow days and during ovulation spotting. Persistent pink can also point to low estrogen, seen in perimenopause, in athletes with intense training loads, or after significant weight loss. If pink spotting continues between cycles, mention it to your doctor.
Orange Period Blood
Orange shades happen when red blood mixes with plenty of cervical mucus. Occasional orange on its own is not a red flag. But orange paired with a fishy or foul odour, itching, or burning suggests bacterial vaginosis or trichomoniasis. See a gynaecologist for a swab test.
Grey Period Blood
Grey is uncommon and usually signals bacterial vaginosis, an overgrowth of vaginal bacteria. In rare cases it can accompany an early miscarriage. Grey discharge with a strong odour needs same-week medical review.
Green Period Blood
Green period blood is rare and almost always tied to infection, most often trichomoniasis (a sexually transmitted infection) or advanced bacterial vaginosis. It can show up as a greenish tinge on the pad, sometimes with a bad smell, itching, or pelvic pain. This is not a wait-and-watch situation. Book a gynaecologist visit and expect a swab test and targeted antibiotics.
Purple or Deep Burgundy Period Blood
Purple and deep burgundy hues are normal variants of dark red blood, usually seen when flow slows, and blood spends longer in the uterus. On its own, purple period blood is not a warning sign.
Period Blood Colour by Day of the Cycle
Most cycles follow a predictable pattern:
- Day 1: Brown or dark red as older blood clears first, then turning brighter red
- Days 2 to 3: Bright red, heaviest flow
- Days 4 to 5: Dark red shifting to brown as flow slows
- Day 6 onward: Brown or pink spotting until the period ends
Small month-to-month differences are normal. What matters most is how your current cycle compares to your own baseline.
Period Blood Clots: What Is Normal?
Small clots the size of a peanut or smaller are common on heavy-flow days. They form when blood pools in the uterus faster than natural anticoagulants can break it down. Clots larger than a one-rupee coin, especially if they repeat every cycle, may point to fibroids, uterine polyps, hormonal imbalance, or thyroid disorders. Heavy clotting paired with fatigue can also indicate iron-deficiency anaemia and deserves a blood test.
What Influences Period Blood Colour
- Hormones: Estrogen and progesterone shifts change flow speed and thickness.
- Age: Teens and perimenopausal women see the most colour variability.
- Contraception: Hormonal IUDs, pills, and injections can lighten or darken flow.
- Stress and sleep: Chronic stress disrupts hormone rhythm and can cause brown spotting.
- Iron levels: Anaemia may cause pale, pink, or watery blood.
- Underlying conditions: PCOS, fibroids, endometriosis, thyroid disorders, and vaginal infections all show up in menstrual patterns.
When Period Blood Colour Signals a Problem
Book a doctor visit without delay if any of the following apply:
- Grey or green blood, especially with odour or itching
- Persistent orange blood with foul smell or discomfort
- Bright red flow soaking through a pad every hour for several hours
- Clots larger than a rupee coin, cycle after cycle
- Bleeding between periods or after intercourse
- Periods longer than seven days
- A sudden shift in your normal colour pattern lasting more than two cycles
- Any bleeding after menopause
Could It Be Blood in Urine, Not Period Blood?
Sometimes what looks like unusual period bleeding is actually blood in urine (haematuria) from a urinary tract infection, bladder issue, or kidney stone. If bleeding occurs only during urination, comes with burning, or continues outside your expected period, a urology evaluation may be needed alongside a gynaecological review. Learn more about urinary tract and bladder conditions or urethral causes of bleeding and discharge.
When to Consult a Doctor
Any bleeding that feels dramatically different from your normal pattern deserves attention. That includes new pain, unusual odour, dizziness, extreme fatigue, or unfamiliar colours such as grey, green, or persistent orange. If you are planning a pregnancy or you are over 40 with changing cycles, a gynaecology consultation gives you a clear baseline. For men's urinary or reproductive concerns, or for a urology second opinion on unexplained bleeding, book a consultation with Dr. Ashish Saini at Excel Advanced Urology Center, Greater Kailash 1, New Delhi.
