What Is Uterine Rupture?
Uterine rupture is an uncommon but serious complication in pregnancy in which the wall of the uterus tears. It requires urgent medical care as it leads to severe internal bleeding and reduction of the baby’s oxygen supply.
Most uterine ruptures occur during labour, when contractions place the greatest pressure on the uterine wall. However, rupture is not limited to labour and can occur before contractions begin, including earlier in pregnancy. Awareness of symptoms is therefore important throughout pregnancy and labour.
Ruptures most often occur in women with a previous uterine scar, such as from a caesarean section. They can also occur in an unscarred uterus, although this is rare.
Key Information
- Uterine rupture is a complete, full-thickness tear of the uterine wall
- A partial separation is known as uterine dehiscence (where the outer layer remains intact)
- Most cases occur at the site of a previous caesarean or other uterine surgery
- It is typically sudden and requires immediate emergency delivery and surgery
- It can cause significant internal bleeding and compromise oxygen supply to the baby
- Early recognition and rapid response are critical
1. What Happens During Uterine Rupture
A rupture occurs when the muscular wall of the uterus tears.
When this happens:
- The uterus can no longer maintain its shape or contract normally.
- Blood vessels may tear, leading internal bleeding.
- The baby may move partially or completely outside the uterine cavity.
- Placental blood flow can be disrupted, reducing oxygen supply to the baby.
Not all ruptures present in the same way, and symptoms can vary. In some cases, the signs are sudden and severe. In others, they may be more subtle at first.
2. When Does Uterine Rupture Happen?
Uterine rupture most commonly occurs during labour, when contractions place the greatest amount of pressure on the uterine wall. However, rupture is not limited to labour and can occur in several different situations.
During Labour (Most Common)
Most ruptures occur while the uterus is contracting strongly. This is more common in women with a uterine scar but can also occur in an unscarred uterus.
Before Labour (Pre-Labour Rupture)
Rupture can occur before contractions begin, particularly if the uterine wall or a scar is weakened or overstretched. Certain uterine anomalies, such as a septate or bicornuate uterus (where the womb has an unusual shape), may increase the risk of preterm rupture.
Postpartum Rupture
In rare cases, a rupture may occur after birth, usually within the first hours. This can happen if a uterine scar gives way as the uterus returns to its normal size, if there was an undetected partial tear during labour, or in situations involving a retained placenta or significant uterine manipulation.
Outside of Labour (Trauma or Medical Causes)
Rupture can also occur outside of pregnancy or labour, for example following accidental trauma (such as a motor vehicle accident) or injury during a medical procedure (iatrogenic rupture).
3. Types of Uterine Rupture
Complete Uterine Rupture
A full-thickness tear of the uterine wall that opens into the abdominal cavity and requires immediate surgical intervention.
Incomplete Uteine Rupture (dehiscence)
A partial separation where the outer layer of the uterus remains intact. It is often discovered during surgery or imaging, but it still indicates stress on the uterine wall.
More details on how rupture develops in What Happens During a Rupture?
4. Why Uterine Rupture Is an Emergency
Uterine rupture can rapidly endanger both mother and baby, which is why it is treated as a true obstetric emergency.
For the baby
The main danger for the baby is a sudden loss of oxygen when placental blood flow is disrupted.
Brain cells are highly sensitive to oxygen deprivation, and injury (hypoxic-ischemic encephalopathy, or HIE) can begin within minutes. In uterine rupture, this drop in oxygen can be sudden and complete.
Emergency caesarean delivery is required to restore oxygen supply. However, even in well-prepared settings, delivery is not immediate. It involves recognising the emergency, moving to theatre, preparing for surgery, and safely delivering the baby. In some cases, the total time to delivery can approach or exceed the window in which brain injury begins.
If oxygen is not restored quickly, outcomes can include severe brain injury, long-term disability, or death.
For the mother
For the mother, the main danger is severe internal bleeding.
The uterus has a very rich blood supply, and bleeding can become life-threatening within a short period of time, especially if the rupture is extensive or not immediately recognised.
This can lead to shock, the need for major transfusion, emergency hysterectomy, and, in severe cases, death.
Why Timing Is Critical
Because these complications can develop so quickly, every minute matters. The priority is immediate recognition, rapid transfer to theatre, and the fastest possible delivery and control of bleeding.
For this reason, in pregnancies where there is a known uterine scar and a vaginal birth is being considered, labour is usually recommended in a hospital setting where emergency care can be provided without delay.
5. How Uterine Rupture Is Managed
If uterine rupture is suspected, immediate action is required. Management typically includes:
- Emergency caesarean delivery
- Rapid control of internal bleeding
- Surgical repair of the uterus, where possible
- Treatment of any associated organ injury
If the uterus cannot be safely repaired, a hysterectomy may be performed.
Signs & Symptoms
Now that you understand when and how uterine rupture occurs, the next step is learning how to recognise it early.
The following page, Signs & Symptoms, explains the sensations, clinical signs, and warning indicators that may suggest a rupture is happening.
Recognising these signs quickly can make a life-saving difference.