A woman’s groin is located in the same place as a man’s: the area where the lower abdomen meets the front of the upper thigh, on each side of the body. The crease that forms when you bend your hip is essentially the surface landmark. Despite the common association of “groin” with male anatomy, the region is defined by the same bony landmarks and muscular boundaries in both sexes, though the internal structures passing through it differ in ways that matter for diagnosis and treatment.
Anatomical Boundaries of the Female Groin
The groin sits in a shallow depression between the abdomen and the thigh. Its upper border follows the inguinal ligament, a tough band of tissue that runs from the bony point at the front of the hip (the anterior superior iliac spine) down and inward to the pubic bone. The lower boundary blends into the front of the upper thigh, and the inner edge reaches toward the pubic region. If you press your fingers into the crease at the top of your thigh while standing, you are touching the surface of the groin.
Beneath the skin and fat of this area lies what anatomists call the femoral triangle, a space in the upper thigh where major blood vessels, nerves, and lymph nodes are relatively close to the surface. The femoral artery and vein pass through here on their way to supply the leg, and a cluster of inguinal lymph nodes sits in the surrounding tissue. A study mapping these lymph nodes found they are distributed across the width of the inguinal ligament, with the most lateral node lying near the hip bone and the most medial node near the pubic tubercle.1PubMed Central. An anatomical study of inguinal lymph node topography and clinical implications for the surgical management of vulval cancer These lymph nodes filter fluid from the lower limbs, the lower abdominal wall, and the external genitalia, which is why swollen groin nodes can signal infections or other issues in any of those areas.
What Is Inside the Female Groin
Running through the groin is a short tunnel in the abdominal wall called the inguinal canal. In men, this canal carries the spermatic cord and its associated vessels to the testes. In women, the same canal exists but carries a much smaller structure: the round ligament of the uterus. The round ligament is a fibrous cord that connects the front of the uterus to the tissue of the labia majora, helping keep the uterus tilted slightly forward. In female infants, the round ligament has been found to pass through the inguinal canal and attach near the ovary via the fallopian tube, with its far end extending toward the labium.2PubMed. Anatomy of the round ligament in female infants and children with an inguinal hernia
Because the round ligament is thinner than the spermatic cord, the female inguinal canal is narrower. This is one reason inguinal hernias are far less common in women than in men. But “less common” does not mean impossible, and the narrower canal can actually make female hernias harder to detect on physical exam.
Several nerves also travel through or near the groin. The ilioinguinal nerve and the genitofemoral nerve both run along or through the inguinal canal and supply sensation to portions of the groin skin, the inner thigh, and parts of the external genitalia. These nerves become clinically relevant when they are compressed or damaged, which can cause chronic groin pain that mimics other conditions.
Why the Word “Groin” Causes Confusion
Part of the reason people search for where a woman’s groin is located is that the term gets used loosely. In everyday conversation, “groin” sometimes refers to the genitals, sometimes to the inner thigh, and sometimes to the hip crease. Medically, it refers specifically to the inguinal region, which is the area around and just below the inguinal ligament. Researchers studying female pelvic anatomy have pointed out that imprecise terminology causes confusion even among medical professionals, and have called for standardized language when discussing these regions.3PubMed Central. Recommended standardized terminology of the anterior female pelvis based on a structured medical literature review A separate effort to standardize terms for the vulva and posterior pelvis identified hundreds of overlapping anatomic terms in the medical literature and proposed new standardized regional terms to reduce ambiguity.4PubMed Central. Recommended standardized anatomic terminology of the posterior female pelvis and vulva based on a structured medical literature review
The groin is not the vulva, and it is not the hip joint, though it neighbors both. Pain from the hip joint can radiate into the groin, and conditions affecting the vulva or pelvic organs can produce symptoms that the patient describes as groin pain. This overlap makes the region a diagnostic crossroads. A clinician examining groin pain in a woman has to consider musculoskeletal, vascular, neurological, and gynecological sources all at once.
Muscle Strains and Athletic Groin Pain
The most common cause of groin pain in both sexes is a strain of the adductor muscles, the group of muscles along the inner thigh that pull the leg inward. These muscles attach to the pubic bone, right at the inner edge of the groin. Sudden changes in direction, sprinting, or kicking can overload these muscles and cause pain that centers on the inner groin.
While men appear somewhat more susceptible to groin injuries overall, adductor injuries rank among the most common injuries in women’s soccer and ice hockey. Seasonal groin pain prevalence in these sports ranges between roughly 20% and 60%, and reinjury rates run between 15% and 30%.5PubMed Central. Current Clinical Concepts: Exercise and Load Management of Adductor Strains, Adductor Ruptures, and Long-Standing Adductor-Related Groin Pain Risk factors for adductor-related groin pain include a previous groin injury, weakness in the hip adductor muscles relative to the abductors, and reduced hip range of motion.6PubMed Central. Adductor-Related Athletic Groin Pain: A Clinical Commentary
Not all groin pain in active women is a simple muscle pull, though. Pain in this area can also stem from stress fractures of the pubic bone, inflammation where tendons attach to bone, or a hernia. When groin pain does not resolve with standard rest and rehabilitation, a broader look at the differential is warranted. As one clinical review put it, groin pain can come from musculoskeletal or non-musculoskeletal origins including avulsion fractures, osteitis pubis, or hernias, and chronic cases can be diagnostically challenging.7PubMed. When groin pain is more than ‘just a strain’: navigating a broad differential
Inguinal Endometriosis
One cause of groin pain that is entirely unique to women is inguinal endometriosis, a condition where endometrial tissue (the type of tissue that normally lines the uterus) grows in or near the inguinal canal. It is uncommon, but it is probably underdiagnosed because it is not on many clinicians’ radar. The tissue responds to the menstrual cycle just as it would inside the uterus, swelling and sometimes bleeding with each period.
The typical presentation is a lump in the groin that becomes painful around menstruation. A systematic review of published cases found 133 reported patients across 61 studies. The mass is usually on one side, and the pain tends to come and go with the menstrual cycle.8PubMed. Inguinal endometriosis: A systematic review Ultrasound is typically used as the first step for diagnosis, and surgical excision through a groin incision is the standard treatment. About half of reported cases involved removing part of the round ligament along with the endometrial deposit.8PubMed. Inguinal endometriosis: A systematic review
The condition can sometimes be mistaken for a hernia, an abscess, or a swollen lymph node. In one published case, a 27-year-old woman presented with an acute painful groin swelling that was initially thought to be a femoral hernia. Surgical exploration and tissue analysis revealed it was endometriosis instead.9PubMed Central. Endometriosis presenting as an acute groin swelling: a case report Other case reports describe women referred to plastic surgery departments for a groin lump before the menstrual-cycle pattern of pain pointed toward the correct diagnosis.10PubMed Central. Whose surgery is this? Endometriosis of the round ligament The takeaway: a groin mass in a woman of reproductive age that worsens with her period should prompt consideration of inguinal endometriosis.
Hernias in the Female Groin
Inguinal hernias occur when tissue pushes through a weak spot in the abdominal wall near the inguinal canal. They are far more common in men, but they do occur in women and girls. In one surgical series, 9 out of 50 patients who presented with congenital groin problems were female and diagnosed with inguinal hernia. Two of the youngest patients had hernias that could not be pushed back in, and one of those was found at surgery to contain an ovary and fallopian tube that had slipped into the hernia sac.11PubMed Central. INGUINAL HERNIA IN FEMALES This is a scenario that simply does not arise in male anatomy and highlights why female groin hernias have distinct surgical considerations.
In adult women, inguinal hernias can be particularly easy to miss on physical examination. Unlike in men, where a hernia often produces a visible bulge in the scrotum, a female inguinal hernia may not cause an obvious lump. One study of 14 women with so-called occult inguinal hernias found that the absence of a detectable bulge on exam was explained by the small size of the hernia and the anatomical differences of the female inguinal canal. Diagnosis depended on recognizing the pattern of intermittent, localized pain and ruling out other causes.12PubMed Central. Occult inguinal hernia in the female
Women are also relatively more likely than men to develop femoral hernias, which occur just below the inguinal ligament where the femoral vessels enter the thigh. The femoral canal is slightly wider in women due to the broader pelvis. Femoral hernias are overall uncommon but carry a higher risk of the hernia contents becoming trapped, which makes them a surgical concern when they do occur.
Nerve Entrapment in the Groin
The ilioinguinal and genitofemoral nerves pass through or alongside the inguinal canal, and either one can become pinched or damaged. This happens most often after surgery in the area, including hernia repair, cesarean section, or abdominal hysterectomy, but it can also follow trauma or develop without an obvious trigger.
The result is a burning or shooting pain in the groin, sometimes extending to the labia or inner thigh, that does not respond to the usual treatments for muscle pain. In a series of 100 patients treated for inguinal nerve entrapment, 48 were women, suggesting this is roughly as common in women as in men among those who develop it.13PubMed. Inguinal neurectomy for inguinal nerve entrapment: an experience with 100 patients A separate long-term study of 36 patients with ilioinguinal or genitofemoral neuralgia found that most cases followed previous inguinal surgery, and that surgical removal of the entrapped portion of the nerve relieved pain in the majority of patients.14PubMed. Diagnosis and treatment of genitofemoral and ilioinguinal neuralgia
In women, nerve entrapment in the groin can sometimes develop after gynecological surgery. One published case described a 54-year-old woman who developed severe left-sided groin, labial, and perineal nerve pain after multiple abdominal operations including cesarean sections and a hysterectomy. Her pain was ultimately traced to damage of the ilioinguinal, iliohypogastric, and genitofemoral nerves, and she was treated with a triple neurectomy.15PubMed. Surgical treatment of intractable pelvic, groin, and perineal neuropathic pain in a gynaecologic patient: triple neurectomy This kind of post-surgical groin pain is something to be aware of: if you develop new burning or shooting pain in the groin after an abdominal or pelvic operation, nerve injury is a possibility worth discussing with your surgeon.
How Pregnancy Affects the Groin
Groin pain is extremely common during pregnancy, and it has multiple contributors. As the uterus grows, the round ligament stretches. Because this ligament passes through the inguinal canal, its stretching can produce sharp, stabbing pains in the groin, especially during sudden movements like standing up quickly or rolling over in bed. This is what is commonly called round ligament pain, and it is generally harmless, though it can be startling.
Hormonal changes add to the picture. During pregnancy, the body produces elevated levels of the hormone relaxin, which loosens ligaments and tendons in preparation for delivery. Relaxin levels are highest in the first three months and again near the end of pregnancy, and this ligament-loosening effect can contribute to instability and discomfort in the pelvic and groin region. In some cases, the combination of ligament relaxation and the weight of the fetus can cause separation of the pubic symphysis, the joint at the front of the pelvis, producing significant pain at the groin and inner thigh.16PubMed Central. Role of relaxin in diastasis of the pubic symphysis peripartum
Pregnancy also increases the risk of inguinal hernia in some women, because the growing uterus raises pressure inside the abdomen and the inguinal canal is already being stretched by the round ligament. Most pregnancy-related groin pain resolves after delivery, but persistent pain that does not improve within several weeks postpartum deserves medical evaluation to rule out hernia, nerve injury, or pubic symphysis dysfunction.
How Groin Pain Is Evaluated
Because so many different structures converge in the groin, pinpointing the cause of pain there often requires imaging. MRI is particularly useful for groin pain because it can visualize muscles, tendons, bones, and soft tissue all at once. It is especially helpful when the pain is hard to localize on physical exam. Ultrasound complements MRI with the advantage of being done in real time, which allows the clinician to watch what happens when you cough, strain, or move the hip.17PubMed Central. Hip Imaging of Groin Pain: Magnetic Resonance and Ultrasound Imaging Features That real-time capability makes ultrasound particularly good at catching small hernias that may only bulge during straining.
For women, the diagnostic workup sometimes extends to gynecological evaluation. If a groin mass is present and its size fluctuates with the menstrual cycle, ultrasound of the groin along with pelvic imaging may be needed to assess for inguinal endometriosis. If nerve pain is suspected, a diagnostic nerve block, where a local anesthetic is injected near the suspected nerve, can confirm the source: if the pain disappears temporarily, the nerve is likely responsible.
Knowing where the groin actually is and what it contains makes it easier to describe your symptoms accurately to a healthcare provider. Telling a doctor that you have pain “in the crease where my thigh meets my abdomen” or “just below the bikini line on one side” conveys more useful anatomical information than saying “groin pain,” which different patients and different doctors may interpret differently. That specificity can shorten the path to the right diagnosis.
Lymph Nodes and When Swelling Is the Concern
Because the inguinal lymph nodes sit in the groin, people sometimes discover a groin “problem” not through pain but by feeling a lump. A small, soft, movable node in the groin is often nothing to worry about. These nodes filter lymph fluid from the legs and genital area, and they can swell temporarily in response to a minor skin infection, an ingrown hair, or even a small cut on the foot. This kind of reactive swelling is common and usually resolves on its own once the triggering irritation clears.
Nodes that are hard, fixed in place, growing over time, or painless deserve prompt medical attention, as these features can signal more serious conditions. Similarly, swollen groin nodes that persist for more than a couple of weeks without an obvious cause, or that appear alongside unexplained weight loss, night sweats, or fatigue, should be evaluated. Your doctor can usually tell a lot from the size, texture, and mobility of the node on exam, and ultrasound can add more detail if needed.
Women sometimes notice groin lymph node swelling during vaginal or urinary tract infections, after bikini-line waxing or shaving (which creates tiny breaks in the skin that can introduce bacteria), or with sexually transmitted infections. The groin nodes are simply doing their job, responding to whatever is happening downstream. Understanding that these nodes live in the groin, not deeper in the pelvis, helps explain why they can be felt just under the skin and why they respond to infections anywhere in the lower body.