Hip pain stems from a wide range of conditions, from cartilage wear and tendon damage to nerve entrapment and problems that originate nowhere near the hip itself. The joint handles extraordinary loads during everyday activity, with forces reaching roughly six times your body weight during stair climbing alone.1PubMed. Physical modelling of hip joint forces in stair climbing That mechanical stress, combined with the hip’s complex anatomy and the sheer variety of structures that can go wrong, means there is rarely one simple explanation for a hip that aches.
Why the Hip Is So Vulnerable
Your hip is a ball-and-socket joint where the rounded head of the thighbone (femur) fits into a cup-shaped socket (acetabulum) in the pelvis. A ring of cartilage called the labrum deepens that socket and helps seal in lubricating fluid. Layers of articular cartilage cushion the bone surfaces, and a web of muscles, tendons, and ligaments holds everything together while allowing a wide range of motion.
The cartilage in weight-bearing areas of the femoral head is measurably stiffer than cartilage in areas that bear less load, a structural adaptation to the forces the joint absorbs.2PubMed Central. Structure and mechanical properties of high-weight-bearing and low-weight-bearing areas of hip cartilage at the micro- and nano-levels Even small variations in the angles of your hip bones can dramatically change how stress is distributed across the cartilage and labrum. A ten-degree shift in the angle of the socket or femur can raise cartilage stress to levels associated with early joint breakdown.3PubMed. Impact of hip anatomical variations on the cartilage stress: a finite element analysis towards the biomechanical exploration of the factors that may explain primary hip arthritis in morphologically normal subjects This helps explain why some people develop hip problems without any obvious injury or risk factor: the geometry they were born with quietly raises the stakes on every step.
During walking, the direction and size of the force on your hip shifts constantly throughout the stride. When your hip extends farther behind you, the forward-directed force on the joint increases by about a quarter compared with a shorter stride.4PubMed Central. Effect of Hip Angle on Anterior Hip Joint Force during Gait That matters because the front of the hip is where labral tears and impingement damage tend to occur. Walking style and stride length are not just habits; they shape the mechanical environment inside the joint over thousands of repetitions a day.
Osteoarthritis and Cartilage Breakdown
Hip osteoarthritis is the most common degenerative cause of hip pain, particularly in people over 50. It is not simply a matter of cartilage “wearing out” like brake pads. The process involves inflammatory signaling molecules that actively break down cartilage, remodeling of the bone underneath, abnormal blood vessel growth in the joint lining, and calcium deposits in the remaining cartilage.5Journal of Pharmacy and Pharmacology. Osteoarthritis of the knee and hip. Part I: aetiology and pathogenesis as a basis for pharmacotherapy It is an active disease, not passive deterioration. That distinction matters because it opens the door to treatments that target the biological process, not just the mechanical consequences.
Early osteoarthritis pain tends to show up during or after activity, especially weight-bearing tasks like climbing stairs or getting out of a chair. As the disease progresses, stiffness in the morning or after sitting for a while becomes common, and pain can start appearing at rest or at night. The location of the ache varies: deep in the groin is most classic, but the pain can radiate to the front of the thigh, the side of the hip, or even the knee. This variability is one reason hip arthritis is sometimes missed or mistaken for a back or knee problem.
Femoroacetabular Impingement
Femoroacetabular impingement, usually called FAI, is a leading cause of hip pain in younger and middle-aged adults. It occurs when extra bone along either the femoral head or the rim of the socket (or both) causes the bones to collide abnormally during movement. The two main patterns are called cam (extra bone on the ball) and pincer (extra bone on the socket rim), and either type can damage the labrum and cartilage over time.6PubMed Central. Femoroacetabular impingement: a review of diagnosis and management
FAI pain is typically felt in the groin and is provoked by activities that involve deep bending at the hip: sitting for long periods, squatting, or pivoting. You might notice a catching or locking sensation. Because the bony abnormality often develops during adolescence and can be present without symptoms for years, many people first become aware of it when they start a new sport or increase their activity level. The labral tears that FAI causes are a separate source of pain and mechanical symptoms, and they do not heal on their own once established.7PubMed Central. The labrum: structure, function, and injury with femoro-acetabular impingement
Lateral Hip Pain and Gluteal Tendon Problems
Pain on the outside of the hip, over the bony point you can feel when you press, has traditionally been called trochanteric bursitis. That diagnosis implies the small fluid-filled sac (bursa) is inflamed, but current evidence tells a different story. Most lateral hip pain is actually driven by damage to the gluteal tendons, specifically the gluteus medius and gluteus minimus, rather than by the bursa itself.8PubMed. MRI and US of gluteal tendinopathy in greater trochanteric pain syndrome The umbrella term “greater trochanteric pain syndrome” better captures this, covering gluteal tendinopathy, abductor tendon tears, and sometimes bursitis as a secondary finding.9Traumatology and Orthopаedics of Kazakhstan. Greater Trochanteric Pain Syndrome: Current Concepts in Lateral Hip Pain
This condition is most common in women from their late forties onward, and it tends to flare with activities that load the outside of the hip: walking, lying on the affected side, climbing stairs, or standing on one leg. If you have been told you have “bursitis” but cortisone injections into the bursa have not helped much, the real problem may be the tendon underneath. Strengthening the gluteal muscles, rather than simply reducing bursal inflammation, tends to be more effective.
Snapping Hip Syndrome
If your hip makes an audible or palpable snap with certain movements, you may have snapping hip syndrome. There are two main types. External snapping happens when the iliotibial band slides over the bony prominence on the outside of the thigh. Internal snapping comes from the iliopsoas tendon catching as it moves over the front of the hip.10PubMed Central. Understanding and Treating the Snapping Hip The internal type often produces an audible pop as the tendon shifts from one side of the femoral head to the other during hip extension and internal rotation.11PubMed Central. Snapping Hip Syndrome: A Comprehensive Update
For many people, snapping hip is painless and more of a curiosity than a problem. It becomes clinically relevant when the snapping is accompanied by pain, weakness, or difficulty with activities like running or dancing. Dancers and athletes who repeatedly move through large ranges of hip motion are particularly prone. Treatment usually starts with stretching and activity modification, and surgery is reserved for cases that do not improve.
When the Pain Is Not Actually Coming from the Hip
One of the trickiest aspects of hip-region pain is that it can originate somewhere else entirely. The lower back is the most common culprit. A pinched nerve in the lumbar spine can send pain into the groin, buttock, or thigh in a pattern that mimics hip joint disease. Conversely, a degenerated hip joint can refer pain down into the lower leg, creating a picture that looks like a spinal problem.12Spine. Difficulty of Diagnosing the Origin of Lower Leg Pain in Patients with Both Lumbar Spinal Stenosis and Hip Joint Osteoarthritis When both conditions exist at the same time, sorting out which one is actually causing the symptoms can be genuinely difficult, even for specialists.
Another source of hip-area pain that is easy to overlook is meralgia paresthetica, a nerve entrapment that produces burning, tingling, or numbness on the outer front of the thigh. It occurs when the lateral cutaneous nerve of the thigh gets compressed, often by tight clothing, weight gain, or scar tissue after surgery. Because its symptoms overlap with lumbar nerve problems, it can be misdiagnosed for years.13PubMed Central. Meralgia paresthetica: a review of the literature There is even a reported association between FAI and meralgia paresthetica, suggesting the hip condition itself may contribute to nerve irritation.14PubMed Central. Meralgia paresthetica and femoral acetabular impingement: a possible association
Avascular Necrosis and Hip Dysplasia
Not all hip pain comes from wear-and-tear or mechanical problems. Avascular necrosis (also called osteonecrosis) occurs when the blood supply to the femoral head is disrupted, causing bone tissue to die. Trauma is the most common trigger, but long-term corticosteroid use, heavy alcohol consumption, and certain blood disorders also raise the risk. Without treatment, the bone collapses and the joint deteriorates rapidly.15PubMed Central. Avascular Necrosis of the Hip in Primary Care Early-stage avascular necrosis can cause a deep, dull ache in the groin that is easy to dismiss. By the time pain becomes severe, the damage is often advanced, which is why persistent unexplained hip pain in someone with known risk factors warrants imaging sooner rather than later.
Hip dysplasia is another condition worth knowing about, particularly for younger adults. It refers to a shallow or poorly formed socket that does not adequately cover the femoral head. Some cases are leftover from developmental dysplasia that was either missed or incompletely corrected in childhood, while others arise from abnormal growth of the socket during adolescence.16PubMed Central. Hip dysplasia in the young adult caused by residual childhood and adolescent-onset dysplasia Both pathways lead to the same problem: the labrum and cartilage at the rim of the socket are overloaded, and degeneration sets in earlier than it otherwise would. Hip dysplasia is sometimes caught incidentally on an X-ray taken for another reason, but it can also announce itself with groin pain during activity in your twenties or thirties.
What Helps Without Surgery
For most causes of hip pain, the first line of treatment is conservative. That includes some combination of exercise, activity modification, weight management, and pain relief with over-the-counter anti-inflammatory medications. The evidence on exercise is strong enough that clinical guidelines for hip osteoarthritis consistently recommend it as a core treatment. Targeted gluteal strengthening programs, gait retraining, and progressive resistance exercises are all approaches being studied for people with mild to moderate hip osteoarthritis.17PubMed Central. Comparing Intra-articular Platelet-Rich Plasma With Hyaluronic Acid for the Treatment of Hip Osteoarthritis: A Systematic Review and Meta-Analysis The goal is not just to reduce pain in the short term but to improve the function of the muscles that stabilize the hip, which can change how forces are distributed across the joint.
Physical therapy for hip pain is not one-size-fits-all. For FAI or labral tears, the focus tends to be on avoiding positions that provoke impingement while strengthening the muscles that control hip rotation and stability. For lateral hip pain from gluteal tendinopathy, the emphasis shifts to progressive loading of the affected tendons, along with avoiding positions that compress them (like crossing your legs or sleeping on the painful side). For referred pain from the spine, treating the back may relieve the hip.
Do Injections Work?
Cortisone injections into the hip joint are widely used and can provide meaningful short-term pain relief, but they do not change the underlying disease. For osteoarthritis, injections of platelet-rich plasma and hyaluronic acid have been marketed as alternatives. A meta-analysis comparing PRP with hyaluronic acid for hip osteoarthritis found that PRP showed modestly better pain scores at six months, but the advantage disappeared by twelve months.17PubMed Central. Comparing Intra-articular Platelet-Rich Plasma With Hyaluronic Acid for the Treatment of Hip Osteoarthritis: A Systematic Review and Meta-Analysis
More provocatively, a network meta-analysis of randomized trials found that a simple saline injection into the hip performed just as well as corticosteroids, PRP, and hyaluronic acid for both pain and function at two-to-four months and again at six months.18British Journal of Sports Medicine. Intra-articular saline injection is as effective as corticosteroids, platelet-rich plasma and hyaluronic acid for hip osteoarthritis pain: a systematic review and network meta-analysis of randomised controlled trials All of the injections, including the placebo, produced clinically meaningful improvement from baseline. This suggests that much of the benefit people experience from hip injections comes from the procedure itself, possibly the mechanical effect of the fluid or the natural history of flares settling down, rather than from the specific substance injected. That does not mean injections are worthless; it means you should calibrate your expectations and not assume an expensive biologic injection will outperform a basic one.
When Surgery Becomes the Right Call
For FAI with labral damage, hip arthroscopy can reshape the bone and repair or reconstruct the labrum. Outcomes for adolescents tend to be excellent: one study with at least five years of follow-up found that over 95% of adolescent patients reached a satisfactory outcome, and none needed a hip replacement during that period.19PubMed. Arthroscopic Labral Treatment in Adolescents: Clinical Outcomes With Minimum 5-Year Follow-up In older adults, results are more nuanced. A study with at least nine years of follow-up reported that patients who did not need a reoperation saw meaningful improvements in pain and function, but the overall reoperation rate was about a third.20PubMed Central. Long-Term Outcomes of Primary Hip Arthroscopy With Labral Repair for Femoroacetabular Impingement: Results at Minimum 9-Year Follow-up For patients aged 40 and older, labral reconstruction appears to outperform labral repair, with failure roughly three times more likely in the repair group.21PubMed. Hip Arthroscopy in Patients Aged 40 Years and Older: Greater Success With Labral Reconstruction Compared With Labral Repair
When arthritis is advanced and conservative measures are no longer managing the pain, total hip replacement remains one of the most successful operations in medicine. A systematic review and meta-analysis of registry data estimated that about three-quarters of hip replacements last 15 to 20 years, and just over half last 25 years.22PubMed Central. How long does a hip replacement last? A systematic review and meta-analysis of case series and national registry reports with more than 15 years of follow-up Implant choice matters: a large registry study found that when surgeons at a high-performing center used the same implants as surgeons elsewhere, the survival rates were virtually identical, suggesting that the specific implant brand is at least as important as the institution performing the surgery.23PLOS Medicine. Factors associated with implant survival following total hip replacement surgery: A registry study of data from the National Joint Registry of England, Wales, Northern Ireland and the Isle of Man If you are facing a hip replacement decision, asking your surgeon about their implant track record is a reasonable conversation to have.
Pregnancy-Related Hip Pain
Hip and pelvic pain during pregnancy is common enough to have its own clinical term: pregnancy-related pelvic girdle pain. It tends to appear in the second or third trimester as ligaments relax under hormonal influence and the shifting center of gravity places new demands on the pelvis. The hormone relaxin has long been blamed, but the evidence linking relaxin levels directly to pelvic girdle pain is surprisingly weak. Among the highest-quality studies on the question, most found no clear association between how much relaxin a woman produced and how severe her symptoms were.24PubMed Central. Pregnancy-related pelvic girdle pain and its relationship with relaxin levels during pregnancy: a systematic review Mechanical factors like posture changes, gluteal muscle weakness, and pre-existing joint laxity may matter more than hormonal levels. The practical takeaway is that strengthening exercises, particularly for the gluteals and pelvic floor, tend to help more than waiting for hormones to settle.
An Evolutionary Trade-Off Underneath It All
There is a broader reason the human hip is so prone to trouble, and it goes back millions of years. When our ancestors transitioned from four-legged to two-legged walking, the hip underwent major structural changes: the femoral head moved higher relative to the greater trochanter, and the neck of the femur shifted to better handle the vertical forces of upright walking. Those adaptations make bipedal locomotion efficient, but they come at a cost. The architecture of the human proximal femur is not well suited to withstand lateral impacts, like a sideways fall.25PubMed Central. Evolutionary roots of the risk of hip fracture in humans Hip fractures, in this view, are a trade-off for walking upright. The risk increases when physical activity drops, because the bone remodeling that maintains femoral neck strength depends on regular loading. Sedentary modern life amplifies a vulnerability that evolution built into the design.
This evolutionary lens adds context to the advice you will hear from every orthopedic surgeon and physical therapist: keep the hip loaded. Regular weight-bearing exercise does not just strengthen muscles and maintain cartilage health. It maintains the internal architecture of the bone itself, preserving a structure that was optimized for a species that walked and ran far more than most of us do today.