Hematoma After C-Section: How Long to Heal?

Most small to moderate hematomas after a cesarean section resolve on their own within two to six weeks, though larger collections of blood can take several months to fully reabsorb. The actual timeline depends on the hematoma’s size, its location, and whether complications like infection develop along the way. One published case of a small bladder flap hematoma showed complete resolution in just two weeks with conservative care, while larger or deeper hematomas in the abdominal wall or retroperitoneal space can linger significantly longer. The range is wide enough that understanding the type of hematoma you’re dealing with matters more than any single number.

What Causes a Hematoma After a Cesarean Delivery

A hematoma is a pocket of blood that collects outside a blood vessel, usually because a vessel was damaged during surgery. Cesarean deliveries involve cutting through several layers of tissue, separating and retracting the abdominal muscles, and making an incision in the uterus. That process can injure small blood vessels in the abdominal wall, the broad ligament near the uterus, the space behind the bladder, or even deeper retroperitoneal tissues.¹ If the bleeding isn’t caught intraoperatively and the vessel doesn’t seal on its own, blood quietly pools and forms a hematoma in the hours or days following surgery.

The inferior epigastric arteries, which run along the inside of the abdominal wall, are particularly vulnerable. When one of these vessels is nicked during retraction or suturing, the resulting hematoma can grow quickly because there’s less tissue containment in the lower abdomen to limit its spread. In severe cases, injury to the inferior epigastric artery can produce a large rectus sheath hematoma, hemoperitoneum (blood in the abdominal cavity), and even hemodynamic instability requiring emergency intervention.² Fortunately, the majority of post-cesarean hematomas are far less dramatic. Many are small, self-limiting pockets of blood near the incision site that your body gradually cleans up without any additional procedures.

Where Hematomas Form and Why Location Matters

Not all post-cesarean hematomas are the same, and where they develop heavily influences both symptoms and healing time. The most common locations include:

Incision site: A superficial hematoma just beneath the skin at the surgical wound. These are the easiest to detect (you can often see or feel swelling and discoloration) and tend to resolve the fastest.
Rectus sheath: Blood collects within the abdominal muscle wall, sometimes tracked by CT imaging into categories based on how far the blood has spread and whether there’s active bleeding. Hematomas below a certain anatomical landmark in the lower abdomen can grow larger because there’s less fascial tissue to contain them.¹
Bladder flap: Blood accumulates in the space between the uterus and the bladder, which was dissected open during surgery. These can cause urinary symptoms and pelvic pain.
Broad ligament or retroperitoneal: Deeper hematomas that form behind the peritoneum or within the ligaments supporting the uterus. These are harder to detect clinically and can grow very large before anyone notices. In one reported case, a massive retroperitoneal hematoma developed 18 hours after an otherwise uneventful cesarean in a patient with severe preeclampsia.³

Superficial incision hematomas generally heal in one to three weeks. A bladder flap hematoma in one published case resolved completely in two weeks with conservative treatment.⁴ Rectus sheath and retroperitoneal hematomas, on the other hand, can take four to eight weeks or longer depending on how large they are and whether they require drainage or other intervention.

Signs That You May Have a Hematoma

Some degree of soreness and bruising is expected after any cesarean delivery, so figuring out whether you’re experiencing something beyond normal recovery can be tricky. Hematomas near the incision are the easiest to spot: you’ll typically notice a firm, tender swelling under or near the wound, often with bluish-purple discoloration of the surrounding skin. The swelling may increase in the first day or two as blood continues to accumulate before the damaged vessel seals.

Deeper hematomas are sneakier. A bladder flap hematoma may show up as pelvic pressure, pain during urination, or blood in the urine. Retroperitoneal or broad-ligament hematomas can cause worsening abdominal or flank pain, a dropping blood count on lab work, lightheadedness, and an unexplained fast heart rate. In the case report of a retroperitoneal hematoma from a cesarean in a patient with preeclampsia, the hematoma wasn’t evident during surgery at all and only declared itself 18 hours later.³ That delayed presentation is why postpartum monitoring of vital signs and hemoglobin levels matters, even when the surgery itself went smoothly.

If your pain is getting worse instead of gradually improving, if you’re soaking through dressings with new bleeding, or if you feel faint or your heart is racing, those are reasons to contact your care team promptly rather than assuming it’s normal recovery discomfort.

How Hematomas Are Diagnosed

Ultrasound is the first tool most clinicians reach for. It’s available at the bedside, doesn’t involve radiation, and can quickly identify a fluid collection near the incision, in the pelvis, or along the abdominal wall. For many straightforward hematomas, an ultrasound is all that’s needed to confirm the diagnosis and estimate the size.⁵

When ultrasound doesn’t give a clear picture, or when the hematoma is deep or the patient’s condition is unstable, CT with contrast is the next step. A contrast-enhanced CT scan can show both the location and size of the hematoma and whether a vessel is actively bleeding. This is how clinicians classify rectus sheath hematomas into severity types and determine whether embolization (blocking the bleeding vessel through a catheter) is needed.² MRI is used less often but can help differentiate a hematoma from other pelvic masses when the picture remains unclear.⁵

Treatment and What It Means for Your Timeline

The majority of post-cesarean hematomas are managed conservatively, meaning the clinical team monitors you, manages your pain, and gives your body time to reabsorb the blood on its own.⁶ Conservative management typically includes rest, ice on the affected area, compression if appropriate, pain medication, and sometimes antibiotics to reduce the risk of infection in the pooled blood. For many small hematomas, this is enough, and healing wraps up in roughly two to four weeks.

Larger or symptomatic hematomas sometimes need more active intervention. The options generally escalate in this order:

Ultrasound-guided drainage: A needle or catheter is inserted through the skin to drain the collected blood. This is less invasive than surgery and is often effective for accessible hematomas that aren’t resolving.
Catheter-based embolization: When a specific artery is still actively bleeding, an interventional radiologist can thread a catheter to the vessel and block it. This was the approach used to control an inferior epigastric artery bleed in one case of massive postpartum hemorrhage after cesarean delivery.²
Surgical evacuation: If conservative care and percutaneous methods fail, reoperation to evacuate the hematoma and control bleeding becomes necessary.⁷ This naturally extends the recovery timeline because you’re now healing from a second procedure on top of the original surgery.

For the retroperitoneal hematoma that developed in the patient with preeclampsia, conservative management with fluids and blood transfusions was successful despite the enormous size of the collection.³ The decision between conservative and interventional approaches depends on the hematoma’s size, whether bleeding is ongoing, and whether your vital signs are stable. A hematoma that requires drainage or surgery will generally add several extra weeks to recovery compared to one that resolves on its own.

Risk Factors That Make Hematomas More Likely

Certain conditions tip the odds toward developing a hematoma. Preeclampsia is one of them. The case of the giant retroperitoneal hematoma occurred in a patient with severe preeclampsia, a condition that can affect blood vessel integrity and clotting function.³ Blood-thinning medications (including the low-molecular-weight heparin sometimes given after cesarean to prevent blood clots) can also raise the risk, creating a frustrating catch-22 where the treatment for one complication can predispose you to another.

Repeat cesarean deliveries carry additional risk because prior surgery creates adhesions and scar tissue that can make dissection more difficult and increase the chance of accidentally injuring a vessel. Obesity, coagulation disorders, and technical factors during the surgery itself, like the degree of muscle retraction needed, also play a role.¹ Emergency cesareans, where speed takes priority and there is less time for meticulous hemostasis, tend to carry higher complication rates than planned procedures.

When a Hematoma Gets Infected

The most worrisome complication of a hematoma that sits around for weeks is infection. Pooled blood is an excellent growth medium for bacteria, and a hematoma that becomes infected turns into an abscess, which is a much more serious problem. Published cases describe abscess formation within post-cesarean hematomas caused by organisms ranging from common skin bacteria to less typical pathogens. One case involved a pelvic abscess caused by Edwardsiella tarda that developed in a hematoma from a previous cesarean, eventually requiring laparoscopic removal.⁸ Another documented a wound hematoma that became infected with Mycoplasma hominis, an organism not routinely covered by standard post-surgical antibiotics.⁹

Signs of an infected hematoma include new or worsening pain after an initial improvement, fever, redness and warmth over the area, and sometimes foul-smelling wound drainage. An infected hematoma almost always needs drainage, either through a needle, a catheter, or surgery, plus a course of targeted antibiotics. This complication can add weeks to the overall healing process and is one reason your care team may prescribe prophylactic antibiotics if your hematoma is large or slow to resolve.

What Recovery Actually Looks Like Week by Week

Because post-cesarean hematomas vary so much in size and location, there isn’t a single recovery calendar that applies to everyone. But here’s a rough sketch of what many people experience:

Week 1: The hematoma is usually at its peak size. Swelling, tenderness, and bruising are at their worst. If the hematoma is superficial, you might notice a hard lump near your incision. Your care team is monitoring hemoglobin levels and watching for signs of expansion.
Weeks 2 to 3: For small hematomas, you may notice the lump softening and shrinking. Bruising changes color from purple to green to yellow as the blood breaks down. A small bladder flap hematoma may be fully gone by now.⁴
Weeks 4 to 6: Moderate-sized hematomas are well into the reabsorption phase. Your body’s immune cells are actively breaking down the clotted blood and clearing the debris. Most people with uncomplicated, conservatively managed hematomas feel substantially better by this point.
Beyond 6 weeks: Large or deep hematomas, particularly those in the retroperitoneal space or those that required drainage, may still be partially present on imaging. Full resolution can take two to three months in some cases. A residual firm area at the incision site that gradually softens over weeks is common and doesn’t necessarily mean something is wrong.

The body clears a hematoma through phagocytosis: immune cells engulf and digest the dead red blood cells and clotted blood products. That process generates the color changes you see in a bruise and is the same mechanism at work in hematomas you can’t see. It’s a slow, steady cleanup rather than a sudden clearing.

How Hematomas Fit Into the Bigger Picture of C-Section Complications

Hematomas are considered an early complication of cesarean delivery, grouped alongside wound infection, dehiscence (the incision pulling apart), and blood clot formation.¹⁰ Most of these early complications are manageable and don’t have lasting consequences, but they do extend your postpartum recovery at a time when you’re already sleep-deprived and caring for a newborn. The practical burden of a hematoma, extra doctor visits, possible imaging, restricted activity, is real even when the medical outcome is ultimately fine.

It’s worth noting that a hematoma doesn’t typically affect your ability to breastfeed, and most pain medications used during conservative management are compatible with nursing. If you need a procedure like drainage or embolization, you may need to pump and discard milk briefly depending on what sedation or contrast agents are used, but this is a temporary interruption, not a reason to stop.

Surgical Technique and Prevention

Some aspects of how a cesarean is performed may influence the risk of hematoma formation and the quality of scar healing. Research on uterine closure, for instance, has found that a double-layer closure of the uterine incision produces a thicker remaining muscle wall compared to a single-layer approach, and that using an unlocked first-layer stitch also results in a thicker scar.¹¹ Bladder adhesions were significantly more common after single-layer closure in one analysis. While these findings relate more to the uterine scar than directly to hematoma formation, they speak to the broader principle that meticulous surgical technique during closure can reduce the cascade of complications that includes bleeding, poor healing, and hematoma development.

Careful hemostasis during surgery, meaning methodically checking for and controlling any bleeding vessels before closing each tissue layer, is the most direct preventive measure. Surgeons also try to avoid unnecessary lateral extension of the uterine incision, which can injure the uterine arteries or their branches. For people who have had prior abdominal surgeries, gentle handling of adhesions during repeat cesareans reduces the likelihood of tearing a vessel that has become embedded in scar tissue.

When to Call Your Doctor Versus When to Wait

If you’ve been told you have a small hematoma and it’s being managed conservatively, the expected trajectory is gradual improvement. Pain should lessen day over day, the lump should soften, and any bruising should fade. A slow pace of improvement is normal and doesn’t automatically mean something is wrong.

Call your provider if you notice any of the following:

Sudden increase in pain or swelling: This could signal expansion of the hematoma or a new bleed.
Fever above 100.4°F (38°C): Fever paired with worsening pain near the hematoma suggests infection.
Lightheadedness, rapid heart rate, or feeling faint: These can indicate significant ongoing blood loss, even if you can’t see external bleeding.
New redness, warmth, or pus: Signs that the hematoma may be developing into an abscess.
Difficulty urinating or blood in urine: Potentially related to a bladder flap hematoma compressing the urinary tract.

Most post-cesarean hematomas ultimately resolve without lasting harm. The waiting is the hard part, especially when your body is already recovering from major surgery and adjusting to life with a newborn. Understanding that the timeline is measured in weeks, not days, can help set realistic expectations. And for those hematomas that do need intervention, the range of available treatments, from simple drainage to embolization, means that even complicated cases are usually brought under control without long-term consequences.

1
North American Proceedings in Gynecology & Obstetrics. Rectus Abdominis Sheath Hematoma Following Cesarean Section: A Case Series
2
International Journal of Drug Delivery Technology. Massive Postpartum Hemorrhage Due To Inferior Epigastric Artery Injury After Cesarean Section Managed By Transcatheter Arterial Embolization- A Case Report
3
PubMed Central. Conservative management of giant retroperitoneal hematoma after cesarean section in severe preeclampsia: a rare case report
4
Obstetrics and Gynaecology Cases – Reviews. Conservative Management of a Large Bladder Flap Hematoma Post Cesarean Section: A Case Report and Mini Review of Literature
5
PubMed. The diagnosis of postcesarean delivery complications with imaging techniques (ultrasound, computed tomography, magnetic resonance imaging, X-ray, and angiography)
6
PubMed. Percutaneous evacuation of anterior abdominal wall hematomas using catheter-based mechanical thrombectomy
7
PubMed Central. Surgical Treatment of a Large Post-cesarean Hematoma in the Retzius Space Accompanied by a Blood Coagulation Disorder: A Rare Case Report
8
PubMed Central. A Case of Pelvic Abscess Caused by Edwardsiella tarda followed by Laparoscopic Resection of a Hematoma Derived from Caesarean Section
9
PubMed Central. Hematoma and abscess formation caused by Mycoplasma hominis following cesarean section
10
PubMed Central. Treatment and repair of uterine scar dehiscence during cesarean section
11
American Journal of Obstetrics and Gynecology. Essential anatomical knowledge for performing routine and complex cesarean delivery