A “high anal hernia” is not a formal diagnostic label you will find in medical textbooks, but the term is commonly used by patients and some clinicians to describe a hernia that develops in the deep pelvic floor near the upper anal canal or rectum. In medical literature, these hernias fall under several recognized categories, including perineal hernias, levator ani hernias, and internal pelvic floor hernias such as enteroceles or sigmoidoceles. What they share is a common location: the muscular and connective-tissue “hammock” that supports the organs of the lower pelvis, including the rectum and anal canal. Understanding which type you are dealing with matters because causes, symptoms, and treatment options differ considerably depending on the specific anatomy involved.
Types of Hernias in the Pelvic Floor Region
The pelvic floor is a layered sheet of muscle and fascia stretching across the base of the pelvis. When part of that sheet weakens or tears, nearby structures can push through the gap. Several distinct hernia types can occur in this area, and when people refer to a hernia “high up” near the anus, they are usually describing one of the following.
A perineal hernia involves tissue bulging through the muscles of the perineum, the area between the anus and the genitals. These are most commonly seen after major pelvic surgery, particularly abdominoperineal resection (APR), a procedure used to treat low rectal or anal cancers in which the rectum and anus are removed entirely. The surgical wound left behind can become a weak point where bowel loops, fat, or other contents herniate downward.
A levator ani hernia is a protrusion through a defect in the levator ani muscle group, which forms the main structural sling of the pelvic floor. In a study using dynamic MRI, about 15 percent of patients with pelvic floor symptoms were found to have levator ani hernias, either on one side or both. These hernias were strongly associated with measurable perineal descent on physical examination.1SpringerLink / Diseases of the Colon & Rectum. Perineal descent and levator ani hernia: a dynamic magnetic resonance imaging study
Internal pelvic floor hernias, such as enteroceles (small bowel dropping into the deep pelvis), sigmoidoceles (the sigmoid colon herniating downward), and omentoceles (fatty omental tissue sliding into the pelvis), are less visible from the outside but can produce significant symptoms. These are often grouped under the umbrella of pelvic organ prolapse and can overlap with what patients perceive as a deep rectal or anal bulge.
What Causes These Hernias
The single biggest risk factor for a perineal hernia is prior pelvic surgery. Abdominoperineal resection is the classic example. When the rectum and anus are removed, the resulting gap in the pelvic floor must be closed, and that closure can fail over time. A systematic review and meta-analysis found that minimally invasive surgery (laparoscopic or robotic APR) carried a significantly higher risk of postoperative perineal hernia than open surgery: roughly 14 percent of patients after minimally invasive APR developed a perineal hernia compared with about 4 percent after open APR.2PubMed Central. Minimally invasive versus open abdominoperineal resection and the risk of postoperative perineal hernia: a systematic review and meta-analysis One proposed explanation is that laparoscopic techniques sometimes leave the pelvic peritoneum open, reducing the structural barrier against herniation.3PubMed Central. Two case reports of perineal hernia after laparoscopic abdominoperineal resection with a proposed modification to the operative technique
For hernias not related to surgery, the causes tend to involve chronic weakening of the pelvic floor. Repeated straining from constipation, chronic coughing, heavy lifting, pregnancy and vaginal delivery, aging, and obesity all place sustained pressure on the muscles and connective tissue of the pelvis. Over time, these forces can create defects large enough for tissue to push through.
Some researchers have explored whether an underlying connective tissue disorder might predispose people to both pelvic floor hernias and abdominal wall hernias at the same time. The logic is appealing: if the collagen in your fascia is inherently weaker, you might be vulnerable at multiple sites. However, a large study of over 1,500 women found no statistically significant association between a history of hernia surgery and pelvic floor disorders like prolapse or incontinence, even after adjusting for delivery history, age, weight, and smoking.4PubMed Central. Association between Pelvic Floor Disorders and Hernias So while the idea of a shared connective tissue weakness is plausible, the data so far have not confirmed it as a strong driver.
Recognizing the Symptoms
The symptoms of a pelvic floor hernia near the anal region depend on what is herniating and where. A perineal hernia after APR surgery often presents as a visible or palpable bulge between the legs, in the area where the anus used to be. Patients describe a sensation of “sitting on a ball” or feeling fullness deep in the pelvis when upright. The bulge typically gets worse with standing, walking, or straining and may partially reduce when lying down.
Levator ani hernias and internal pelvic hernias are harder to spot because the protrusion is deeper. Symptoms can include:
- Pelvic pressure: A persistent feeling of heaviness or dragging in the lower pelvis, particularly when upright for long periods.
- Difficulty evacuating: Incomplete emptying of the bowel, or the need to press on the perineum or vaginal wall to help stool pass.
- Pain or discomfort: Aching in the perineal area, lower back, or deep buttock, often worsening over the course of the day.
- Urinary symptoms: In some cases, a large pelvic hernia can press on the bladder or urethra, leading to urinary urgency or difficulty starting a stream.
Because many of these symptoms overlap with other pelvic floor conditions like rectal prolapse, rectocele, or simple hemorrhoidal disease, they are frequently misdiagnosed or dismissed. A hernia near the upper anal canal is especially easy to miss on a routine physical exam because it may only become apparent when the patient is straining or standing.
How These Hernias Are Diagnosed
Standard physical examination can detect perineal hernias that create an obvious external bulge, but most deeper pelvic floor hernias require imaging to confirm. Two main imaging approaches are used: conventional defecography and MRI defecography.
Conventional defecography involves filling the rectum (and sometimes the vagina and bladder) with contrast material and then taking X-ray images while the patient strains and evacuates. It provides a real-time picture of how the pelvic organs move during defecation and is particularly good at catching internal hernias. MRI defecography does the same thing but uses magnetic resonance imaging instead of X-rays, offering better soft-tissue contrast and avoiding radiation exposure.
Both approaches have trade-offs. Research comparing the two techniques found that MRI defecography had 100 percent specificity, meaning it did not produce false positives. However, its sensitivity varied by hernia type: it detected omentoceles about 95 percent of the time, sigmoidoceles about 82 percent of the time, but caught enteroceles only around 65 percent of the time. Conventional defecography outperformed MRI for those harder-to-detect enteroceles.5PubMed. Dynamic MRI defecography vs. entero-colpo-cysto-defecography in the evaluation of midline pelvic floor hernias in female pelvic floor disorders6PubMed Central. Role of conventional radiology and MRi defecography of pelvic floor hernias
In practice, the choice often depends on what is available at your hospital. MRI is preferred when there is concern about radiation or when the surgeon wants detailed anatomical mapping before planning a repair. Conventional defecography may still be the better first step when the suspicion is specifically for an enterocele, because MRI misses about a third of them.
When Treatment Is Needed
Not every pelvic floor hernia requires surgery. Small, asymptomatic hernias found incidentally on imaging are often monitored. If symptoms are mild, conservative measures can help: pelvic floor physical therapy to strengthen the surrounding muscles, dietary changes to reduce straining, weight management, and supportive garments. For postoperative perineal hernias, a well-fitted perineal support or cushion can reduce discomfort for people who are not good surgical candidates.
Surgery becomes the conversation when the hernia causes significant pain, obstructive symptoms, skin breakdown over the bulge, or bowel obstruction. Bowel incarceration or strangulation within a perineal hernia is a genuine emergency, though it is uncommon.
Surgical Approaches and What the Evidence Shows
Surgeons can approach a pelvic floor hernia repair from below (through the perineum), from above (through the abdomen), or through a combined route. Each has trade-offs that matter to outcomes and recovery.
Perineal approaches are generally less invasive, involve shorter operating times, and allow faster initial recovery. However, they provide a more limited view of the pelvic anatomy, which can make it harder to achieve a durable repair. Abdominal approaches, whether open or laparoscopic, give the surgeon a wider operative field and the ability to place mesh reinforcement more securely, but they come with a longer hospital stay and a bigger physiological toll. Research on the related problem of recurrent rectal prolapse, which shares overlapping anatomy and surgical principles, found that the recurrence rate after a perineal approach was roughly 28 percent compared to about 16 percent after an abdominal approach.7PubMed Central. Comparison between perineal and abdominal approaches for the surgical treatment of recurrent external rectal prolapse: a systematic review and meta-analysis Perineal hernia-specific literature mirrors this pattern: abdominal approaches tend to offer lower recurrence rates, while perineal repairs suit patients who cannot tolerate a bigger operation.8Seminars in Colon and Rectal Surgery. Perineal Hernias: Diagnosis and surgical management
The decision is highly individualized. A frail older patient with limited life expectancy may benefit more from a less invasive perineal repair, accepting a higher chance of recurrence in exchange for a safer recovery. A younger, healthier patient with a large symptomatic hernia is more likely to be offered an abdominal repair aimed at long-term durability.
Mesh, Flaps, and Reconstruction Materials
Most hernia repairs today involve some form of reinforcement material to bridge or buttress the weakened tissue. The two broad categories are synthetic mesh (typically made of polypropylene or polyester) and biological mesh (derived from human or animal tissue). For routine hernia repair in other body regions, the evidence consistently favors synthetic mesh. A systematic review comparing the two for ventral hernia repair and abdominal wall reconstruction found that biological meshes were associated with roughly double the recurrence rate, higher infection rates, higher readmission rates, and longer hospital stays compared to synthetic mesh.9PubMed. Synthetic Versus Biological Mesh in Ventral Hernia Repair and Abdominal Wall Reconstruction: A Systematic Review and Recommendations from Evidence-Based Medicine Similarly, for laparoscopic groin hernia repair, synthetic mesh remains the standard because it combines strong evidence support, durable reinforcement, and favorable cost-effectiveness.10International Journal of Current Pharmaceutical Review and Research. Comparing Synthetic Versus Biological Mesh in Laparoscopic Groin Hernia Repair
Perineal hernia repair complicates this picture, though. Many patients needing perineal hernia surgery have had prior radiation therapy for rectal cancer, and irradiated tissue heals poorly. Placing synthetic mesh into a radiated, potentially contaminated surgical field carries a real risk of chronic infection and mesh erosion. In these situations, biological mesh or tissue flaps become more attractive options despite their higher general recurrence rates, because the alternative might be a synthetic mesh that never incorporates properly into damaged tissue.
For patients with large perineal defects, especially after APR with prior radiation, surgeons sometimes bring in living tissue from elsewhere in the body. The vertical rectus abdominis myocutaneous (VRAM) flap takes muscle and skin from the lower abdomen, tunnels it down into the pelvis, and uses it to fill the dead space and provide a well-vascularized surface for healing. A study comparing VRAM flap reconstruction to simple direct closure found that in patients who had received radiation and chemotherapy before surgery, the VRAM flap led to significantly fewer severe perineal complications.11PubMed Central. Reconstruction of the perineal defect after abdominoperineal resection with vertical rectus abdominis myocutaneous (VRAM) flap versus primary direct closure – a single center retrospective cohort study This approach adds complexity and creates a donor-site wound on the abdomen, but for the right patient it can mean the difference between a chronic wound problem and reliable healing.
Recurrence and Long-Term Outlook
Hernia recurrence is a persistent challenge across all hernia types and locations. For inguinal hernias (the most common type overall), a large multi-institutional study found a recurrence rate of about 5.5 percent, with the highest proportion recurring within the first year after surgery.12PubMed Central. Retrospective study on prevalence of recurrent inguinal hernia: a large-scale multi-institutional study Perineal and pelvic floor hernias tend to recur more often than inguinal hernias because the pelvic floor is under constant pressure from gravity and intra-abdominal forces, and many patients have underlying tissue quality issues from radiation, prior surgery, or aging.
After perineal hernia repair specifically, recurrence rates in published case series vary widely, ranging from single digits to over 30 percent depending on technique, patient health, and whether radiation was involved. There is no single “expected” recurrence number because the patient population is so heterogeneous. What the data do suggest is that abdominal approaches, mesh reinforcement, and tissue flap reconstruction each independently improve the odds of a lasting repair, and the best outcomes tend to come from combining several of these strategies in patients who can tolerate a more extensive operation.
The Cost Factor in Surgical Decisions
Surgical technique choices are not made purely on clinical grounds. Robotic and laparoscopic platforms have expanded the options for pelvic floor surgery, but they come at a price. A retrospective cost analysis of robotic versus laparoscopic approaches for elective abdominal procedures found that robotic surgery was significantly more expensive, with average costs of roughly $29,700 for robotic cases compared to about $23,500 for laparoscopic cases.13PubMed. Retrospective cost analysis of robotic and laparoscopic anti-reflux surgery and paraesophageal hernia repair While this study focused on upper abdominal procedures, the cost differential between robotic and conventional laparoscopic platforms is a consistent finding across surgical specialties. For pelvic floor hernia repair, where the evidence already suggests that minimally invasive techniques may carry higher hernia recurrence rates than open surgery, the added cost of robotics raises real questions about value. The technology may offer benefits in specific cases where the surgeon needs enhanced visualization in a narrow pelvis, but it is not automatically the better choice.
Why These Hernias Are Underrecognized
Pelvic floor hernias near the anal region are diagnosed far less frequently than groin or abdominal wall hernias, and much of that gap is likely underdiagnosis rather than true rarity. Patients are often embarrassed to describe symptoms involving the perineum and may attribute pelvic pressure or incomplete evacuation to aging, hemorrhoids, or general pelvic floor weakness. Clinicians may not think to look for a hernia in this location unless the patient has had prior APR surgery, because the condition is rarely covered in general medical training.
Imaging is underutilized too. Dynamic defecography, the gold standard for detecting internal pelvic hernias, requires specialized equipment and radiologist expertise that not every hospital has. Many patients with pelvic floor symptoms get a standard pelvic MRI or CT scan, neither of which captures the dynamic movement of organs during straining that reveals a hernia. If the hernia only appears during Valsalva effort, a static scan will miss it entirely.
For anyone experiencing persistent pelvic heaviness, a sensation of something bulging near the anus, or difficulty emptying the bowel that does not respond to usual treatments, asking specifically about pelvic floor hernias and requesting dynamic imaging is reasonable. The condition is treatable, but it has to be found first.