Lochia rubra is the first stage of postpartum bleeding that begins immediately after delivering the placenta. It’s a thick, dark red discharge made up of blood, uterine lining cells, white blood cells, and tissue debris from where the placenta was attached. This initial stage typically lasts about 3 to 4 days, though the median duration in one study of postpartum women was 4 days before it transitions to a lighter form of discharge.
What Lochia Rubra Is Made Of
During pregnancy, the uterus builds a rich lining to support the placenta. After delivery, that lining needs to be shed. Lochia rubra is the heaviest part of that process. The discharge contains red blood cells, white blood cells, fragments of the uterine lining, and leftover tissue from the placental attachment site. It looks and feels similar to a heavy menstrual period, with a deep red or red-brown color and a thick consistency. Small clots are normal during this stage, especially in the first 24 hours.
The flow is heaviest right after birth and gradually tapers. You may notice a gush of fluid when you stand up after lying down for a while. This happens because blood pools in the vaginal canal while you’re resting, then releases with gravity. It can be startling, but it’s a normal pattern during the rubra phase.
Why the Bleeding Happens
The placenta leaves behind a wound on the inner wall of the uterus, roughly the size of a dinner plate. Your uterus immediately begins contracting after delivery to compress the blood vessels at that wound site and slow the bleeding. These contractions are strongest during the first 12 hours postpartum and continue in the days that follow. You’ll likely feel them as cramping, sometimes called “afterpains,” which can intensify during breastfeeding because nursing triggers the same hormones that cause the uterus to contract.
This entire process is called involution: the uterus shrinking back toward its pre-pregnancy size while shedding extra tissue. The contractions serve two purposes at once. They reduce blood flow to the placental site to prevent excessive bleeding, and they physically squeeze the uterus smaller. Over the course of about six weeks, the uterus goes from roughly 2 pounds back down to about 2 ounces. Lochia rubra is the visible evidence of the earliest, most active phase of that healing.
The Three Stages of Lochia
Lochia rubra is the first of three stages of postpartum discharge, each named for its color as the bleeding gradually lightens:
- Lochia rubra (red): Dark red, heavy flow lasting roughly 3 to 4 days. This is the stage with the most active bleeding and tissue shedding.
- Lochia serosa (pinkish): A thinner, pinkish or brownish discharge that replaces rubra and continues until about day 10, though the median duration in research is around 22 days. It contains less blood and more wound fluid as the uterus continues healing.
- Lochia alba (white): A yellowish-white discharge that marks the final stage. By this point, active bleeding has stopped and the discharge is mostly white blood cells and residual uterine lining.
The total duration of all three stages combined has a median of about 33 days, though it varies widely between individuals. The color change from one stage to the next should be gradual. A sudden return to bright red bleeding after the discharge had already lightened can signal that you’re overdoing physical activity or, less commonly, that the healing process has been disrupted.
Managing the Flow
During the rubra phase, use thick postpartum pads rather than tampons. Inserting anything into the vagina during this period increases the risk of introducing bacteria to the healing uterine wound. Most hospitals send you home with mesh underwear and oversized pads for this reason. You’ll likely go through pads frequently in the first day or two, then less often as the flow decreases.
Physical activity tends to increase the flow temporarily. Standing, walking, and lifting can all cause a noticeable uptick in bleeding. This doesn’t necessarily mean something is wrong, but persistent heavy bleeding after rest is worth paying attention to. Breastfeeding can also cause a temporary increase in cramping and flow because it stimulates uterine contractions.
Signs of a Problem
Heavy bleeding is expected during the rubra phase, but there’s a line between normal postpartum flow and excessive hemorrhage. According to national clinical guidelines, soaking through one pad in 15 minutes or less is a sign of excessive bleeding. Blood clots larger than a lemon, or a sudden large gush of blood, also warrant immediate medical attention. These can indicate that the uterus isn’t contracting effectively or that the blood vessels at the placental site aren’t closing properly, a condition called subinvolution.
Odor is another important signal. Lochia rubra has a mild, slightly metallic smell similar to menstrual blood. A foul or unusually strong odor, especially paired with fever, chills, or increasing abdominal pain, can point to an infection of the uterine lining. This is more likely if the rubra phase seems to drag on well beyond the expected window or if the discharge doesn’t follow the normal color progression toward pink and then white.
Bright red bleeding that returns after your lochia had already transitioned to a lighter color is also worth noting. It sometimes means you’ve been too active too soon, and resting will resolve it. But if rest doesn’t slow the bleeding, or if it’s accompanied by large clots or dizziness, it could indicate retained placental tissue or a healing complication that needs evaluation.