Postpartum Hemorrhage (PPH)

What postpartum hemorrhage is

After the baby is born, the placenta separates from the wall of the uterus, leaving a wound where large blood vessels fed it. The uterus normally clamps down hard, squeezing those vessels shut like a tourniquet. Clotting completes the seal. When the uterus does not contract, the birth canal is torn, placenta remains inside or blood cannot clot, bleeding continues.

At term, about 500 to 700 ml of blood flows through the uterus every minute, so blood loss can become life-threatening within minutes. Visual estimates often underestimate blood loss, which is why many hospitals now weigh pads and drapes to measure it.

Primary vs secondary PPH

Causes: the 4 Ts

Risk factors

• previous postpartum hemorrhage
• an overstretched uterus: twins or more, a large baby, excess amniotic fluid
• long or very fast labor, or labor induced or augmented with oxytocin
• infection in the uterus during labor (chorioamnionitis)
• cesarean birth, especially emergency cesarean
• forceps or vacuum delivery
• placenta previa, placental abruption or placenta accreta
• fibroids
• preeclampsia, HELLP syndrome
• anemia before birth, which leaves less reserve
• general anesthesia and some medicines that relax the uterus

Many people who have a PPH have no risk factors, so every birth is managed with hemorrhage in mind.

Symptoms

• bleeding that is heavy and does not slow, or comes in a sudden gush
• large clots
• a soft, boggy uterus on feeling the belly, instead of a firm ball
• signs of blood loss: fast pulse, dizziness, faintness, pale skin, sweating, shortness of breath, confusion, falling blood pressure
• pain and swelling in the vagina or perineum (a hematoma can hide blood loss)

Healthy pregnant people compensate well, so the pulse and blood pressure may stay normal until large amounts have been lost. A rising heart rate is often the earliest warning.

How much bleeding is normal after birth?

Bleeding after birth (lochia) is normal for up to 4 to 6 weeks:

• First 3 to 4 days: bright red, like a heavy period, with small clots
• Days 4 to 10: pinkish-brown and lighter
• After about day 10: yellowish-white, tapering off

A brief increase in flow when you stand up or breastfeed is normal. Soaking a pad an hour, large clots or a return to heavy bright red bleeding is not.

Treatment

Hospitals use a staged response with a team that works in parallel: checking the cause, giving medicines and preparing blood.

First steps

• Call for help and place two large IV lines.
• Uterine massage: firmly rubbing the uterus through the belly to make it contract, and emptying the bladder.
• Uterotonic medicines that make the uterus contract: oxytocin first, then methylergonovine (avoided with high blood pressure), carboprost (avoided with asthma) or misoprostol.
• Tranexamic acid, which slows clot breakdown. WHO recommends it within 3 hours of birth for all PPH; earlier is better.
• Fluids and blood transfusion, including plasma and platelets in massive hemorrhage.

Finding and treating the cause

• Repair of tears and draining hematomas.
• Manual removal of the placenta or retained fragments in the operating room.
• Correcting clotting problems with blood products and fibrinogen.

If bleeding continues

• Intrauterine balloon tamponade or a vacuum-induced device to compress or collapse the uterus.
• Uterine artery embolization by interventional radiology.
• Surgery: compression sutures (such as the B-Lynch suture), tying off uterine arteries, and as a last resort, hysterectomy to save the mother's life.

Prevention

• Active management of the third stage of labor: giving oxytocin right after the baby is born is routine and reduces PPH by more than half.
• Treating anemia in pregnancy with iron.
• Planning delivery in a hospital with blood bank and surgical services for people with placenta previa or accreta, or other high risks.
• Hemorrhage risk assessment on admission and quantitative blood loss measurement.

Complications and recovery

• Anemia, causing tiredness, breathlessness and difficulty breastfeeding; treated with iron tablets or IV iron, sometimes transfusion
• Shock and organ damage, including kidney injury
• Transfusion reactions and infection
• Sheehan syndrome: damage to the pituitary gland from severe blood loss, which can cause failure to produce breast milk, missing periods and fatigue
• Loss of fertility after hysterectomy
• Emotional effects: a frightening birth raises the risk of postpartum depression and post-traumatic stress; talk to your care team

Most people recover fully. Having had a PPH raises the risk in a future pregnancy, so tell your provider so they can plan.

Frequently asked questions

What are the warning signs of postpartum hemorrhage?

Soaking 1 or more pads an hour, passing clots larger than an egg, blood running down your legs, or feeling dizzy, faint, short of breath or having a racing heart. These need emergency care, even days or weeks after going home.

What is the most common cause of postpartum hemorrhage?

Uterine atony, where the uterus fails to contract firmly after birth, causes about 3 in 4 cases. Other causes include tears in the birth canal, retained placenta and clotting problems, summarized as the 4 Ts: tone, trauma, tissue and thrombin.

How long after birth can postpartum hemorrhage happen?

Most happen within the first 24 hours, usually the first hour. Secondary postpartum hemorrhage can happen from 24 hours up to 12 weeks after birth, often caused by retained placental tissue or infection, and usually occurs at home.

How much bleeding is normal after giving birth?

Bleeding like a heavy period for the first few days, with small clots, is normal. It should gradually lighten and change color from red to pink-brown to yellow-white over 4 to 6 weeks. Sudden heavy red bleeding or large clots are not normal.

Can postpartum hemorrhage be prevented?

Not always, but the risk can be greatly reduced. Giving oxytocin right after the birth, treating anemia during pregnancy, planning delivery in a well-equipped hospital for high-risk pregnancies, and recognizing bleeding early all lower the chance of severe hemorrhage.