A hematoma on or near the vagina is a contained collection of blood that forms in the soft tissue of the vulva, vaginal wall, or surrounding pelvic structures after blood vessels rupture without an open wound to let the blood escape. The most common cause is childbirth, though straddle injuries, pelvic surgery, and sexual trauma can also be responsible. These hematomas range from small, self-limiting swellings to rapidly expanding masses that threaten cardiovascular stability, and the approach to treatment depends heavily on size, location, and how fast the bleeding is progressing.
Why This Area Is Vulnerable
The vulva and vaginal canal have an unusually rich blood supply. The primary feeder is the pudendal artery, which branches from the internal iliac artery deep in the pelvis and courses through a winding anatomic path before reaching the external genitalia.1PubMed Central. A case of vulvar hematoma with rupture of pseudoaneurysm of pudendal artery This artery passes along the back of the ischial spine, dips through bony openings in the pelvis, and eventually gives rise to branches that supply the labia, clitoris, and vaginal walls.2PubMed Central. Anatomic structure of the internal iliac artery and its educative dissection for peripartum and pelvic hemorrhage Because so many vessels converge in a relatively small area of loose connective tissue, even a single torn vessel can bleed substantially. The tissue itself is soft and distensible, so blood can accumulate quickly before external swelling becomes obvious.
This combination of dense vascularity and compliant tissue explains why a hematoma here can grow from unnoticeable to grapefruit-sized in a matter of hours. It also explains why the area is particularly vulnerable during events that stretch, compress, or tear it, such as vaginal delivery or a fall onto a hard object.
Postpartum Hematomas and What Raises the Risk
Childbirth is by far the most frequent cause. In one large study tracking over 147,000 deliveries, about 1 in 2,500 women developed a postpartum vulvar or vaginal hematoma.3PubMed Central. Clinical predictors of postpartum vaginal and vulvar hematomas and the need for surgical treatment Another institution reported a rate closer to 1 in 1,100, with the vulvovaginal type being the most common.4PubMed Central. Risk Factors and Incidence of Puerperal Genital Haematomas The variation likely reflects differences in how aggressively each center screened for hematomas and how the deliveries were managed.
Several factors raise the odds substantially. In the larger study, episiotomy carried the strongest independent association, with roughly 36 times the odds compared to deliveries without one. Second-degree vaginal lacerations and vacuum-assisted delivery also independently increased risk, at about 10 times and 5 times the odds respectively.5PubMed Central. Clinical predictors of postpartum vaginal and vulvar hematomas and the need for surgical treatment The second study identified first-time mothers, hypertensive disorders of pregnancy, episiotomy, and coagulation problems as significant risk factors.6PubMed Central. Risk Factors and Incidence of Puerperal Genital Haematomas
Interestingly, the larger study also found two apparent protective factors: epidural analgesia and higher body mass index. The epidural effect might seem counterintuitive, but one explanation is that effective pain relief allows for a more controlled second stage of labor, with less sudden, forceful pushing that could tear vessels. The BMI finding is less well understood and may reflect differences in tissue compliance or in the likelihood of receiving an episiotomy.
Causes Outside of Childbirth
Hematomas in this area do not require pregnancy or delivery to occur. Among younger patients, straddle injuries are the leading non-obstetric cause. A straddle injury happens when the vulva is compressed against a hard surface, such as a bicycle crossbar, playground equipment, or a fence rail. In a study of non-obstetric vulvar hematomas, every premenarchal patient (those who had not yet started menstruation) presented after a straddle-type fall, while among older adolescents and young women, about half had straddle injuries and the other half resulted from consensual sexual intercourse or recent vulvar surgery.7PubMed. Non-Obstetric Traumatic Vulvar Hematomas in Premenarchal and Postmenarchal Girls
A separate review of non-obstetric vulvovaginal injuries documented a wider array of mechanisms: falls from bicycles, landing on metal objects, athletic injuries involving foreign objects, animal-related trauma, and penetrating injuries. Intracoital injuries, particularly rupture of the posterior vaginal fornix, also featured in this group.8PubMed. Nonobstetrics vulvovaginal injuries: mechanism and outcome The common thread is that a blow or stretch tears a blood vessel in an area where the tissue can accommodate a large volume of blood before the pressure builds enough to slow the bleeding.
Pelvic and vaginal surgery is another recognized cause. After vaginal hysterectomy with a specific type of pelvic floor repair, for example, roughly one in five patients in one study developed a pelvic hematoma, and about a quarter of those hematomas went on to become infected.9PubMed. Infected pelvic hematoma following vaginal hysterectomy with uterosacral ligament suspension for treatment of apical prolapse That rate is high enough that post-surgical monitoring for signs of a new hematoma is standard practice.
Recognizing the Symptoms
The hallmark symptom is pain, usually described as intense pressure or throbbing in the perineal or pelvic region. In postpartum patients, symptoms typically develop within a few hours of delivery, though a small or slowly growing hematoma may not cause recognizable problems for a day or two.10Clinical Case Reports Journal. Conservative Management of Large Spontaneous Vaginal Hematoma in the Puerperium In the larger postpartum study, the average time to diagnosis was about one day after delivery.11PubMed Central. Clinical predictors of postpartum vaginal and vulvar hematomas and the need for surgical treatment
What a person notices depends on the size and location of the hematoma:
- Small vulvar hematoma: A painful, tense lump on one side of the labia, sometimes with visible bruising. It may make sitting uncomfortable but does not cause systemic symptoms.
- Large or expanding hematoma: A rapidly growing mass that can reach the size of a grapefruit or larger, accompanied by lightheadedness, rapid heart rate, drop in blood pressure, and difficulty urinating. Some patients describe back pain rather than perineal pain.
- Paravaginal hematoma: The blood collects alongside or behind the vaginal wall rather than on the surface. There may be no visible swelling externally, only severe rectal pressure, the urge to push, or urinary retention. This type is easier to miss.
Continued vaginal bleeding sometimes accompanies the hematoma, but not always. In some cases there is no visible bleeding at all, and pain alone prompts the examination that reveals it.12Clinical Case Reports Journal. Conservative Management of Large Spontaneous Vaginal Hematoma in the Puerperium The absence of obvious blood loss can be misleading, since the blood is simply pooling internally rather than draining out.
How Hematomas Are Diagnosed
A visible vulvar hematoma is usually diagnosed on physical examination alone. The swelling is often unmistakable: a tense, blue-purple, tender mass on one side. Paravaginal and deeper pelvic hematomas are harder to see, and imaging is needed. Ultrasound, performed either through the abdomen or against the perineum, is the first-line tool. In a review of postpartum paravaginal hematomas, ultrasound reliably identified them as dark fluid collections sitting behind the vaginal wall, typically ranging from about 4 to 10 centimeters.13PubMed. The use of ultrasound in the evaluation of postpartum paravaginal hematomas Common reasons for ordering the ultrasound in these cases were pelvic or perianal pain, vulvar swelling, and urinary retention, often in combination.
CT or MRI may be used when the hematoma is suspected to extend deep into the pelvis or when surgery is being planned and precise boundaries need to be mapped. In an emergency where the patient is hemodynamically unstable, imaging sometimes takes a back seat to immediate intervention, but in most cases at least a bedside ultrasound is performed to confirm the diagnosis and estimate size.
Treatment Approaches
Treatment decisions hinge on whether the hematoma is stable or expanding, and on how large it is. There is no single size cutoff that dictates surgery for everyone, but the general principles are well established.
Conservative Management
Small, stable hematomas that are not growing and are not causing cardiovascular symptoms can often be managed without surgery. This means ice packs, pain control, close monitoring of vital signs, and serial examinations to check whether the mass is getting bigger. The body gradually reabsorbs the blood over days to weeks. The clinical literature on puerperal hematomas emphasizes that good surgical technique during episiotomy and laceration repair, with careful attention to stopping any active bleeding, is the most effective way to prevent hematomas from forming in the first place.14Elsevier. PUERPERAL EMERGENCY: Vaginal and Vulvar Hematomas But when a hematoma does occur and remains small and stable, watchful waiting is a reasonable choice.
Surgical Drainage
Large hematomas, or any hematoma that is clearly expanding, typically require surgical evacuation. The procedure involves making an incision over the most prominent point of the swelling, removing accumulated blood clots, identifying and tying off any actively bleeding vessels, and then closing the wound.15Journal of Wound Management and Research. Pediatric Vulvar Hematoma: Surgical Management and Developmental Considerations: Two Case Reports In one case report of a large non-obstetric vulvar hematoma, surgeons removed over 500 milliliters of clotted blood and closed the cavity with absorbable sutures, without needing to place a drain.16Journal of Case Reports and Images in Obstetrics and Gynecology. Surgical management of a large non-obstetric vulvar hematoma: A case report Half a liter of blood is a significant amount for what appears externally to be “just” a swelling on the labia, which is why these hematomas can cause hemodynamic instability even when the patient has no obvious external blood loss.
Aggressive correction of fluid loss is as important as the surgery itself. Patients with large hematomas may need blood transfusion, IV fluids, and intensive monitoring. The literature stresses early diagnosis and prompt, aggressive intervention for any hematoma that is large or growing, because delays increase the risk of complications.17Elsevier. PUERPERAL EMERGENCY: Vaginal and Vulvar Hematomas
Angiographic Embolization
When surgery is difficult, the bleeding source cannot be found, or the hematoma keeps recurring after drainage, interventional radiologists can thread a catheter into the pelvic arteries and block the bleeding vessel from the inside using tiny particles or coils. This approach, known as embolization, is considered safe and minimally invasive, and avoids the need for repeat open surgery.18PubMed Central. Angiographic Embolization in the Treatment of Puerperal Hematoma It is particularly useful for deep pelvic hematomas where the bleeding vessel sits in an area that is surgically hard to reach, and it can be both diagnostic and therapeutic, since the angiogram itself shows exactly where the bleeding is coming from.
Complications to Watch For
Most hematomas that are recognized and treated promptly resolve without long-term problems. The danger lies in the ones that are missed or underestimated. Rapidly expanding hematomas can cause hemodynamic instability from internal blood loss, meaning the patient’s blood pressure drops and heart rate climbs even though there may be little visible bleeding. If left untreated, the pressure from a large hematoma can also damage surrounding soft tissue, leading to tissue death, and the stagnant blood can become a breeding ground for bacteria, causing secondary infection.19Journal of Wound Management and Research. Pediatric Vulvar Hematoma: Surgical Management and Developmental Considerations: Two Case Reports
Infection risk is not just theoretical. After vaginal hysterectomy with pelvic floor repair, about 5% of patients who developed a pelvic hematoma went on to develop an infected hematoma, requiring additional treatment with antibiotics and sometimes further drainage.20PubMed. Infected pelvic hematoma following vaginal hysterectomy with uterosacral ligament suspension for treatment of apical prolapse Warning signs of an infected hematoma include fever, increasing redness and warmth around the area, foul-smelling discharge, and worsening pain after an initial improvement.
When to Seek Emergency Care
Not every bruise or swelling in the genital area requires an emergency room visit, but certain signs should prompt immediate evaluation:
- Rapid growth: A lump that is visibly increasing in size over minutes to hours.
- Cardiovascular symptoms: Lightheadedness, feeling faint, a racing pulse, or pale and clammy skin, all of which suggest significant internal blood loss.
- Inability to urinate: A large hematoma can compress the urethra or bladder.
- Severe pain unresponsive to over-the-counter medication: Especially after delivery, surgery, or an injury to the area.
- Fever or worsening symptoms after initial improvement: This suggests possible infection of the hematoma.
After a vaginal delivery, any perineal pain that seems disproportionate to the delivery or that is getting worse rather than better over the first several hours should be reported to the medical team. Pain is the most reliable early warning sign, and the earlier a hematoma is caught, the more likely it is to respond to conservative measures without surgery.
Forensic Considerations in Children and Adolescents
When a vulvar hematoma occurs in a child, the mechanism matters enormously. A clear straddle injury, where the child fell onto a hard object and both the history and injury pattern match, is the most common scenario. But clinicians evaluating these injuries are trained to consider non-accidental trauma. The pattern of bruising, the child’s account of what happened, and whether the physical findings are consistent with the stated mechanism all factor into the assessment. As one study noted, vulvovaginal injuries in children require careful inspection because of their potential forensic implications.21PubMed. Nonobstetrics vulvovaginal injuries: mechanism and outcome
This does not mean that every childhood vulvar bruise triggers a forensic investigation. Straddle injuries are common and usually have a straightforward explanation. But when the history does not match the injury, when there are signs of penetrating trauma, or when the child offers inconsistent accounts, the treating team has a responsibility to investigate further. Parents or caregivers bringing a child in for evaluation should expect detailed questions about how the injury occurred, and should understand that these questions are a routine part of the assessment rather than an accusation.
The Psychological Side of Perineal Trauma
Physical recovery from a genital hematoma gets most of the attention, but the psychological impact deserves mention, especially for postpartum patients. A study examining the relationship between perineal trauma and postpartum mental health found that women who experienced perineal trauma reported more physical symptoms after birth and were more likely to show signs of post-traumatic stress. Each additional physical symptom was associated with a substantial increase in the odds of adverse psychological outcomes, including anxiety and depression.22PubMed Central. The relationship between perineal trauma and postpartum psychological outcomes: a secondary analysis of a population-based survey
A large painful hematoma that requires surgical drainage, delays bonding with a newborn, or prolongs a hospital stay can compound these effects. Some patients report feeling blindsided by the complication, since hematomas are rarely discussed in prenatal education. If you are recovering from one, the pain and disruption are real, and it is reasonable to ask for mental health support alongside the physical treatment, particularly if the experience is affecting your ability to care for yourself or your baby in the weeks that follow.