A hemorrhage during birth is heavy bleeding that occurs around the time of delivery, most commonly right after the baby and placenta are delivered. It affects roughly 1 in 10 women worldwide and is the leading cause of maternal death globally, accounting for about 27% of maternal deaths, though the vast majority of cases are both treatable and preventable with modern care.
How Much Bleeding Counts as a Hemorrhage
Some bleeding during and after delivery is completely normal. The body loses blood as the placenta separates from the uterine wall, and a typical vaginal delivery involves a few hundred milliliters of blood loss. A hemorrhage is diagnosed when that bleeding becomes excessive, generally defined as 500 mL or more after a vaginal birth or 1,000 mL or more after a cesarean section. To put that in perspective, 500 mL is about two cups of fluid.
Severe hemorrhage, where blood loss climbs significantly higher, affects about 1 in 20 women who give birth. At that level, the bleeding can become life-threatening without prompt intervention.
When It Happens: Early vs. Late
Most hemorrhages happen in the first 24 hours after delivery. This is called primary postpartum hemorrhage, and it typically begins right after the placenta is delivered. The bleeding may be sudden and dramatic, or it can be a steady flow that adds up quickly.
Secondary hemorrhage is less common and occurs between 24 hours and up to 12 weeks after birth. This type is often caused by leftover placental tissue or an infection in the uterus. It can catch people off guard because it shows up days or weeks into recovery, sometimes after a mother has already gone home.
The Four Main Causes
Doctors organize the causes of birth hemorrhage into four categories, sometimes called the “four Ts”: tone, trauma, tissue, and thrombin.
- Tone (uterine atony) is by far the most common cause, responsible for about 70% of cases. After the placenta detaches, the uterus is supposed to contract tightly to clamp down on the blood vessels where the placenta was attached. When the uterus stays soft and doesn’t contract, those vessels keep bleeding freely. Risk factors include a long labor, a very large baby, carrying multiples, or having had several previous pregnancies.
- Trauma accounts for roughly 20% of cases. This includes tears to the cervix, vagina, or perineum during delivery, as well as the rare but serious rupture of the uterus itself. Assisted deliveries using forceps or vacuum increase the chance of these injuries.
- Tissue causes about 10% of hemorrhages. When pieces of the placenta or blood clots remain inside the uterus, they prevent it from contracting properly. The uterus essentially can’t close down on the bleeding vessels because something is in the way.
- Thrombin (clotting problems) is the rarest cause, occurring in less than 1% of cases. Some women have conditions that prevent their blood from clotting normally, either pre-existing disorders or problems that develop during pregnancy, such as after a placental abruption.
What It Feels and Looks Like
The most obvious sign is heavy vaginal bleeding that doesn’t slow down after delivery. But the body can initially compensate for blood loss, which means vital signs may appear relatively normal even when a significant amount of blood has been lost. With losses under 1,000 mL, heart rate and blood pressure may change only slightly.
As bleeding continues past that point, symptoms become more noticeable. A racing heart rate and dropping blood pressure are the clearest signals, along with dizziness, lightheadedness, paleness, cold or clammy skin, and feeling weak or restless. Confusion and difficulty breathing are signs of severe blood loss. Some women describe feeling an overwhelming sense that something is wrong before anyone else notices the bleeding, especially when blood is pooling internally rather than flowing visibly.
One tricky aspect is that blood loss during delivery is notoriously hard to measure accurately. Blood mixes with amniotic fluid, is absorbed into towels and drapes, and can accumulate inside the uterus without being visible. Medical teams now increasingly use quantitative methods like weighing blood-soaked materials to get a more accurate picture.
How It’s Treated
Treatment follows a step-by-step approach, starting with the least invasive options and escalating if needed.
The first response for uterine atony is vigorous uterine massage, where a provider presses on the abdomen to stimulate the uterus to contract. Medications that cause the uterus to contract are given at the same time. These work quickly in most cases, and the bleeding stops within minutes.
If the bleeding is caused by retained tissue, the provider will manually remove it. Tears from delivery are repaired with stitches. Throughout treatment, IV fluids and sometimes blood transfusions replace what’s been lost.
When medications and manual techniques aren’t enough, doctors can place a special balloon inside the uterus that inflates to apply direct pressure against the bleeding vessels. In more resistant cases, surgical techniques use stitches to compress the uterus from the outside. These two approaches can even be combined in what’s called a “uterine sandwich,” with compression from both inside and outside. As a last resort, surgical removal of the uterus (hysterectomy) stops the bleeding definitively, but this is uncommon and reserved for truly life-threatening situations.
How Hospitals Work to Prevent It
Most hospitals use a proactive approach called active management of the third stage of labor, which has significantly reduced hemorrhage rates. This involves three steps performed right around the time the placenta is delivered: giving a medication (typically a synthetic form of the hormone that triggers contractions) just before or immediately after the baby is born, clamping the umbilical cord, and using gentle, controlled traction on the cord to help deliver the placenta smoothly rather than waiting passively for it to separate on its own.
This bundle of interventions is now standard practice in most delivery settings worldwide. It’s one of the main reasons that hemorrhage, while still common, is far less often fatal in facilities with trained staff and available supplies.
Recovery After a Hemorrhage
Recovery depends heavily on how much blood was lost. After a mild to moderate hemorrhage, the most common issue is anemia, which can leave you feeling exhausted, short of breath, and dizzy for weeks or even months. Iron supplements and sometimes iron infusions help rebuild blood stores, but full recovery of energy levels can take six to eight weeks or longer.
Women who experienced a significant hemorrhage are also more likely to struggle with breastfeeding in the early days, partly because of fatigue and partly because the body prioritizes its own recovery. Emotional effects are common too. A frightening delivery experience, especially one involving emergency intervention, can contribute to postpartum anxiety or post-traumatic stress.
In very rare cases where blood loss was extreme, a condition called Sheehan syndrome can develop. The pituitary gland, a small structure at the base of the brain that controls many hormones, is deprived of oxygen during severe bleeding and some of its tissue dies. This can cause long-term hormonal problems including difficulty producing breast milk, irregular periods, low blood pressure, fatigue, and trouble conceiving in the future. Symptoms sometimes don’t appear until months or years later, which makes it easy to miss.
Risk Factors Worth Knowing
Certain factors raise the likelihood of hemorrhage, though it can happen to anyone. A previous postpartum hemorrhage is one of the strongest predictors. Other risk factors include carrying twins or triplets, having a very large baby, a labor that was either very prolonged or very rapid, needing labor induction or augmentation, having had multiple previous deliveries, obesity, and conditions like placenta previa (where the placenta covers the cervix). Cesarean delivery carries a higher baseline blood loss than vaginal birth, which is why its threshold for defining hemorrhage is set higher.
Knowing your risk factors ahead of delivery allows your care team to prepare, for example by having blood products on hand or by planning for additional monitoring during the third stage of labor. Many hospitals now use hemorrhage risk assessment tools at the time of admission to flag patients who may need closer attention.