Pain where your leg meets your hip stems from a surprisingly long list of possible causes, ranging from worn-down cartilage and inflamed tendons to nerve entrapment and problems that originate in your lower back rather than the hip itself. The hip joint is the body’s largest ball-and-socket joint, loaded with up to five times your body weight during a run, and wrapped in layers of muscle, tendon, and connective tissue that can each become a pain source on their own. What makes hip-area pain tricky is that the location of the pain, whether it sits in the groin crease, along the outer thigh, or deep in the buttock, often points to very different underlying problems.
Location Matters More Than You Think
Clinicians who evaluate hip pain start by asking a deceptively simple question: where exactly does it hurt? Musculoskeletal hip pain generally falls into three zones, each with its own set of likely culprits. Posterior pain, felt in the buttock or back of the hip, raises suspicion for problems like sacroiliac joint dysfunction, piriformis syndrome, hamstring tendon issues, or pain referred from the lumbar spine. Lateral pain, along the outer hip and upper thigh, most often traces to gluteal tendon problems or irritation of the iliotibial band. Anterior pain, felt in the groin crease or front of the thigh, splits further into problems inside the joint itself, like labral tears and osteoarthritis, and problems outside it, like snapping hip syndrome or athletic pubalgia.1PubMed Central. Posterior, Lateral, and Anterior Hip Pain Due to Musculoskeletal Origin: A Narrative Literature Review of History, Physical Examination, and Diagnostic Imaging
Even when the underlying problem is the same, people feel it differently. In a study of over 200 patients with femoroacetabular impingement, a structural hip condition, about 70% reported the classic anterior groin pain. But roughly 30% felt the pain laterally, posteriorly, or in a mix of locations.2PubMed. Atypical Hip Pain in Femoroacetabular Impingement: A Comparison of Outcomes Based on Primary Hip Pain Location That variability is one reason hip pain is so often misdiagnosed or attributed to the wrong structure.
Femoroacetabular Impingement and Labral Tears
One of the most common structural causes of hip pain in younger and middle-aged adults is femoroacetabular impingement, or FAI. This is a mismatch in shape between the ball of the femur and the socket of the pelvis. The mismatch causes abnormal contact during movement, gradually damaging the ring of cartilage that lines the socket rim, called the labrum, and the smooth cartilage covering the joint surfaces. The hallmark symptom is a slow-building, persistent groin ache that often worsens with prolonged sitting, deep squats, or activities that push the hip into a combination of bending and turning inward.3PubMed Central. An Updated Review of Femoroacetabular Impingement Syndrome
FAI comes in three flavors depending on where the extra bone sits. A cam-type bump lives on the ball side of the joint, a pincer-type overhang sits on the socket side, and the mixed type has both. All three cause the same basic problem: the joint doesn’t glide cleanly through its full range, and the labrum and cartilage take the hit over time. That damage is what raises the long-term risk of hip osteoarthritis.
Labral tears, whether caused by FAI or by other factors like trauma, joint hypermobility, or shallow hip sockets, tend to show up as anterior hip or groin pain. Many people also notice mechanical symptoms: clicking, catching, or a sensation that the hip gives way during certain movements.4PubMed Central. A comprehensive review of hip labral tears These mechanical signs can be useful in distinguishing a labral tear from other sources of groin pain, though the symptoms overlap enough that imaging is usually needed to confirm the diagnosis.5PubMed. Acetabular labral tears of the hip: examination and diagnostic challenges
Physical activity level also plays a role. A population-based study found that higher cumulative lifetime physical activity was associated with greater hip pain risk regardless of whether cam or pincer bone changes were present on X-ray. People who had both the bone changes and high activity levels faced the steepest odds.6PubMed. Relationship between physical activity and hip pain in persons with and without cam or pincer morphology: a population-based case-control study In short, the structural mismatch loads the gun, but years of heavy use pull the trigger.
Greater Trochanteric Pain Syndrome and Snapping Hip
If your pain lives on the outer hip rather than the groin, the most likely explanation is something happening at or near the greater trochanter, the bony bump you can feel on the side of your upper thigh. Greater trochanteric pain syndrome, or GTPS, is an umbrella term for tenderness in that area, typically caused by irritation of the gluteal tendons or the thin fluid-filled sac that sits between them and the bone. It used to be called trochanteric bursitis, and many clinicians still use that label, but research now shows the bursa itself is inflamed in only a fraction of cases; gluteal tendon problems are more often the real issue.7PubMed Central. Lateral Hip Pain: Relation to Greater Trochanteric Pain Syndrome
GTPS is especially common in women over 40 and in people with a wider pelvis, weak hip abductors, or leg-length discrepancies. The pain tends to flare when lying on the affected side at night, climbing stairs, or walking for extended periods. It can be sharp and localized, or it can radiate down the outer thigh in a way that gets confused with sciatica.8PubMed Central. Greater trochanteric pain syndrome: epidemiology and associated factors
A related but distinct nuisance is snapping hip syndrome. Some people hear or feel an audible snap when they walk, swing their leg, or stand up from a chair. External snapping is usually the iliotibial band rolling over the greater trochanter on the outer hip. Internal snapping, felt in the groin, is typically the iliopsoas tendon sliding over a bony prominence or the femoral head itself.9PubMed Central. Understanding and Treating the Snapping Hip A painless snap is common and harmless. But when snapping is accompanied by pain, it usually means the tendon is inflamed or the repeated friction has caused local irritation.10PubMed. Internal snapping hip syndrome: treatment by endoscopic release of the iliopsoas tendon
When the Pain Isn’t Coming From the Hip at All
Here’s where things get genuinely confusing: the groin and hip area is a convergence zone for nerves from the lower spine, the pelvis, and the abdominal wall. Problems in any of those places can create convincing hip pain even though the joint is perfectly fine.
Sacroiliac joint dysfunction is the most frequent non-hip source of groin pain. In one study, nearly half of patients with sacroiliac joint problems reported groin pain. Lumbar spinal stenosis and disc herniations also referred pain to the groin in a smaller but meaningful percentage of cases, typically involving nerve roots in the upper-to-middle lumbar spine.11PubMed. Groin pain associated with sacroiliac joint dysfunction and lumbar disorders The practical takeaway is that if you have groin pain that doesn’t respond to treatment directed at the hip, your lower back and sacroiliac joint deserve a look.
Athletic pubalgia, sometimes called a sports hernia, is another common mimicker. It involves a disruption in the connective tissue where the abdominal muscles and adductor tendons attach near the pubic bone. It’s most common in athletes who do a lot of cutting, twisting, and kicking, and the pain tends to center in the lower abdomen or inner groin. The overlap with true hip-joint pain is significant enough that MRI is often needed to sort out whether the tendons, the joint, or both are involved.12PubMed Central. Athletic pubalgia and associated rehabilitation
Nerve Entrapment Along the Outer Thigh
If your pain presents as burning, tingling, or numbness on the front and side of your thigh rather than deep joint aching, the culprit may be a trapped nerve. Meralgia paresthetica is entrapment of the lateral femoral cutaneous nerve, which runs from the pelvis down under the inguinal ligament into the thigh. Tight clothing, belts, weight gain, pregnancy, and prolonged standing can all compress it. The hallmark is a patch of altered sensation on the outer thigh, sometimes with a burning quality that doesn’t match any joint-related pattern.13PubMed Central. Meralgia paresthetica: a review of the literature
Interestingly, one case report flagged an association between meralgia paresthetica and femoroacetabular impingement, suggesting that structural hip changes might sometimes contribute to the nerve getting pinched.14PubMed Central. Meralgia paresthetica and femoral acetabular impingement: a possible association That link hasn’t been established at a population level, but it’s a reminder that the hip area is anatomically cramped, and one problem can set the stage for another.
Bone-Level Threats Worth Knowing About
Two bone-level problems deserve mention because they’re both uncommon enough to get missed and serious enough that a delay in diagnosis changes outcomes.
Femoral neck stress fractures occur when repetitive loading exceeds the bone’s ability to remodel. They’re most prevalent among distance runners and military recruits, and women appear to be at higher risk. The typical presentation is exercise-related groin pain that builds gradually over weeks, worsens during training, and may eventually hurt with ordinary walking.15PubMed Central. Femoral Neck Stress Fractures in Sport: A Current Concepts Review Standard X-rays often look normal in the early stages; MRI is usually needed for a reliable diagnosis.16PubMed Central. Management and treatment of femoral neck stress fractures in recreational runners: a report of four cases and review of the literature The concern is that an unrecognized stress fracture can progress to a displaced fracture, which is a far more serious injury requiring surgical repair and sometimes leading to long-term complications.17PubMed Central. Lateral femoral neck stress fractures: A case report
Avascular necrosis, or osteonecrosis of the femoral head, is a different kind of bone problem. It happens when blood supply to the ball of the hip joint is interrupted, causing the bone to die and eventually collapse. The most common trigger is trauma, but it also occurs with long-term corticosteroid use, heavy alcohol intake, and certain blood disorders. In some cases, no clear risk factor is identified. Pain typically worsens when starting to move or putting weight on the affected side, and early diagnosis through MRI can help delay or avoid joint replacement.18PubMed Central. Avascular Necrosis of the Hip in Primary Care
The Osteoarthritis X-Ray Puzzle
Many people assume that if they’re over a certain age and their hip hurts, arthritis is the obvious culprit. But the relationship between what an X-ray shows and what a person actually feels is surprisingly loose. In the Framingham cohort study, only about 16% of hips with frequent pain showed radiographic evidence of osteoarthritis. And going the other direction, roughly one in five hips with visible arthritis on X-ray were frequently painful.19BMJ. Association of hip pain with radiographic evidence of hip osteoarthritis: diagnostic test study
What this means in practice is that an X-ray showing “some arthritis” doesn’t necessarily explain your pain, and a clean-looking X-ray doesn’t mean nothing is wrong. The same study found that even among older adults whose pain pattern strongly suggested hip osteoarthritis, meaning groin or anterior pain with painful internal rotation, most did not have radiographic evidence to match. This gap is one reason clinicians increasingly rely on a combination of symptom history, physical exam findings, and advanced imaging rather than X-rays alone to figure out what’s driving hip pain.
How Clinicians Narrow It Down
Given how many structures can create pain in the same small region, diagnosis usually involves a layered approach. The physical exam includes provocative tests that stress specific structures to see what reproduces the pain. For suspected labral tears or FAI, the most commonly used test involves bending the hip, bringing it across the midline, and rotating the thigh inward. A systematic review found this test was highly sensitive, meaning it catches most true labral tears, but not very specific, meaning a positive result doesn’t guarantee a labral tear is the source.20PubMed Central. Sensitivity and Specificity for Physical Examination Tests in Diagnosing Prearthritic Intra-Articular Hip Pathology Are Highly Variable: A Systematic Review A different test that pushes the hip into flexion, abduction, and external rotation showed higher specificity, meaning a positive result more reliably rules in a particular problem.
When the exam and imaging leave doubt, diagnostic injections can be clarifying. Injecting a local anesthetic directly into the hip joint under image guidance temporarily numbs the joint. If the pain disappears, the source is almost certainly inside the joint. If it doesn’t, something outside the joint is responsible. One study found that this approach had very high accuracy for predicting who would benefit from hip replacement surgery.21PubMed. Accuracy of diagnostic injection in differentiating source of atypical hip pain A meta-analysis confirmed the general utility of this technique for sorting out whether osteoarthritis inside the joint was driving the pain.22PubMed. Is anesthetic hip joint injection useful in diagnosing hip osteoarthritis? A meta-analysis of case series
What Actually Helps
Treatment depends entirely on which structure is responsible, which is why getting the diagnosis right matters so much. For osteoarthritis-related hip pain, the evidence for physical therapy is more nuanced than you might expect. A randomized trial comparing active physical therapy against sham therapy in people with hip osteoarthritis found that both groups improved, but the active group did not improve more than the sham group on either pain or function scores at 13 weeks.23JAMA. Effect of Physical Therapy on Pain and Function in Patients With Hip Osteoarthritis: A Randomized Clinical Trial That doesn’t mean exercise is useless. It may mean that the specific protocol matters, or that hands-on manual therapy techniques need to be part of the mix. A case series found that combining manual therapy with exercise produced meaningful improvements in pain and function for hip osteoarthritis patients, with outcomes that outperformed exercise alone in the existing literature.24PubMed. Clinical outcomes following manual physical therapy and exercise for hip osteoarthritis: A case series
For FAI and labral tears, initial management is typically conservative: activity modification, targeted strengthening of the hip and core muscles, and anti-inflammatory medication. When symptoms persist, arthroscopic surgery to reshape the bone and repair or debride the labrum is an established option, especially in younger patients hoping to stay active. For GTPS, the mainstays are physical therapy focused on gluteal strengthening, activity modification to avoid aggravating positions, and sometimes corticosteroid injections for short-term relief. Athletic pubalgia usually responds to a structured rehabilitation program, though surgery is sometimes needed when conservative treatment fails.
Why the Hip Joint Takes Such a Beating
It helps to understand just how much force the hip handles to appreciate why so many things can go wrong there. Direct measurements from instrumented hip implants have shown that simply walking at a moderate pace generates peak forces in the range of about three to five times your body weight on the joint. Jogging pushes that to roughly five and a half times body weight. A single stumble can spike the load even higher.25Journal of Biomechanics. Hip joint loading during walking and running, measured in two patients Running and single-leg hopping impose forces on the hip up to about 83% higher than walking.26PubMed Central. Lower limb joint loading during high-impact activities: implication for bone health
The evolutionary backstory adds context. When human ancestors transitioned to habitual upright walking, the hip underwent major architectural changes in bone structure and muscle arrangement. The gluteus maximus grew dramatically, the hamstrings shifted function, and the hip abductors took on a new stabilizing role for each step of single-leg stance. These adaptations made us efficient walkers and long-distance runners but came at the cost of maximum power and flexibility.27PubMed Central. Evolution of the human hip. Part 2: muscling the double extension The hip is, in a sense, optimized for endurance but vulnerable to the kinds of repetitive and high-impact forces modern life throws at it.
Inflammatory Conditions and the Hip
Not all hip pain is mechanical. Systemic inflammatory conditions can target the hip joint directly. Ankylosing spondylitis, a type of inflammatory arthritis that primarily affects the spine, involves the hip in a notable fraction of patients. In a Korean cohort study of nearly 500 people with the condition, about 12% had hip arthritis. Those with longer disease duration and more advanced spinal involvement were more likely to develop severe hip damage, and a subset ultimately required hip replacement.28PubMed Central. Characteristics of hip involvement in patients with ankylosing spondylitis in Korea Rheumatoid arthritis, psoriatic arthritis, and gout can also affect the hip, though they more commonly debut in smaller joints first.
The red flags for an inflammatory cause include pain that worsens with rest rather than activity, significant morning stiffness lasting more than 30 minutes, and symptoms that improve with movement and anti-inflammatory medication. If your hip pain follows that pattern, especially if you’re under 40 and have a family history of autoimmune disease, it’s worth flagging to your doctor.
Hip Pain in Children and Adolescents
Though most of this article focuses on adults, it’s worth noting that children and teenagers can develop hip pain from causes that don’t exist in the adult population. One of the more important is slipped capital femoral epiphysis, a condition in which the growth plate at the top of the femur weakens and the ball of the hip shifts out of position. It typically occurs in adolescents, especially those who are overweight, and should be suspected in any adolescent complaining of hip, groin, or knee pain.29PubMed Central. Early onset slipped capital femoral epiphysis in children under 10 years old
The tricky part is that the pain often shows up somewhere other than the hip. In one study, over 40% of affected hips presented with atypical pain, including pain in the thigh, knee, or posterolateral leg rather than the classic groin location.30PubMed. Patterns of Pain in Adolescents with Slipped Capital Femoral Epiphysis A limping teenager with knee pain and no obvious knee injury should always have their hip evaluated. Delayed diagnosis can lead to permanent damage to the hip joint’s blood supply and shape.