The most common reason your hip aches when you lie on your side is a condition called greater trochanteric pain syndrome, or GTPS. It affects the bony prominence on the outside of your hip and the tendons and fluid-filled sacs around it. Lying directly on this area compresses already irritated tissue against a hard surface, which is why the pain can feel mild or absent during the day but ramp up the moment you settle into bed. The good news is that most cases respond well to targeted exercises and a few simple changes in how you sleep.
What Is Actually Happening Inside the Hip
For decades, doctors blamed lateral hip pain almost entirely on “trochanteric bursitis,” an inflammation of the small cushioning sacs (bursae) that sit over the bony knob at the top of your thighbone. Treatment usually meant anti-inflammatory pills and a steroid injection, which worked for many people but left a substantial number still hurting. Over the past decade or so, research has shown that the picture is more complicated. GTPS is now understood as an umbrella term that covers bursitis, snapping hip, and tendon problems in the gluteal muscles that attach near the greater trochanter.1PubMed. Greater Trochanteric Pain Syndrome
The biggest shift in thinking is that gluteal tendinopathy, rather than bursitis alone, is the primary local source of lateral hip pain in most people with GTPS.2Journal of Orthopaedic & Sports Physical Therapy. Gluteal Tendinopathy: Integrating Pathomechanics and Clinical Features in Its Management The gluteus medius and gluteus minimus are the two muscles that stabilize your pelvis every time you stand on one leg, walk, or climb stairs. Their tendons anchor into the greater trochanter, and when those tendons become damaged or degenerated, the outer hip becomes tender. Lying on that side presses your body weight directly onto the inflamed tendon insertion, which is why side-sleeping on the affected hip is one of the signature complaints people bring to their doctor.
Why the Pain Gets Worse at Night
If you have noticed that your hip pain is milder during the day and sharper once you go to bed, you are not imagining it. A cross-sectional study of people with GTPS found that pain intensity was significantly higher in the evening compared to the morning and afternoon.3Frontiers in Medicine. Increased adiposity and impaired sleep are associated with severity of greater trochanteric pain syndrome: a cross-sectional study Several things converge to explain this. Throughout the day your posture, activity, and loading patterns accumulate mechanical stress on the trochanter region. Then at night you lie on a relatively firm surface and stay in one position far longer than you would during waking hours. Side-sleeping, the position most adults prefer, parks the full weight of your torso directly over the trochanter for hours at a stretch.
A classic clinical description of trochanteric pain notes that the pain is “most severe at night, when she attempted to lie on her right side,” and in roughly a quarter to two-fifths of cases the discomfort radiates down the outer thigh.4Mayo Clinic Proceedings. Trochanteric Bursitis (Greater Trochanter Pain Syndrome) That radiation pattern can mimic sciatica or a pinched nerve, which is one reason lateral hip pain is frequently misdiagnosed. The pain rarely travels past the knee, though, which is a useful way to distinguish it from a true lumbar nerve-root problem.
Sleep disturbance is a hallmark of the condition and not just an inconvenience. In people with hip osteoarthritis, a study found that about four in five patients scored poorly on a standardized sleep-quality index, and worse hip pain and dysfunction strongly predicted worse sleep.5PubMed Central. Sleep quality and nocturnal pain in patients with hip osteoarthritis For people with GTPS, the dynamic is similar: pain disrupts sleep, poor sleep lowers the pain threshold, and the cycle feeds on itself.
Who Is Most Likely to Develop Lateral Hip Pain
GTPS is common in the general population and disproportionately affects women, especially those in midlife. Research has linked the condition to declining estrogen levels after menopause, which reduces collagen production in tendons, making them thinner and more prone to degeneration and even rupture.6PubMed Central. Does menopausal hormone therapy (MHT), exercise or a combination of both, improve pain and function in post-menopausal women with greater trochanteric pain syndrome (GTPS)? A randomised controlled trial The broader biomechanical picture also matters: women tend to have wider pelvises relative to femur length, which increases the angle of pull on the gluteal tendons and concentrates more compressive force over the trochanter during single-leg stance activities like walking.
The condition is not limited to post-menopausal women, though. It shows up in athletes and in people who do not exercise regularly. Increased body weight is another risk factor; a study of GTPS patients found that greater adiposity correlated with more severe symptoms.3Frontiers in Medicine. Increased adiposity and impaired sleep are associated with severity of greater trochanteric pain syndrome: a cross-sectional study The extra load increases the compressive and tensile forces on the gluteal tendons with every step, and it adds more downward pressure on the trochanter when you lie on your side.
Other Conditions That Hurt When You Lie on Your Hip
GTPS is the most frequent cause, but it is not the only one. If your hip pain has a different character or location, one of several other diagnoses could be at play.
Hip osteoarthritis tends to produce a deep, groin-centered ache rather than pain on the outside of the hip, but it can still flare at night. People with hip arthritis report significant sleep disruption, and the pain can worsen in any lying position because removing the hip from a loaded, upright stance does not always relieve the joint inflammation inside the capsule.5PubMed Central. Sleep quality and nocturnal pain in patients with hip osteoarthritis
Lumbar nerve-root irritation is another source of pain that people feel around the hip and outer thigh. The L2 through L5 nerve roots can refer pain to the lateral hip and thigh when they are compressed or inflamed, typically by a disc bulge or spinal stenosis. L4 and L5 involvement is more likely to send pain below the knee as well, which helps separate it from GTPS.7Pain Medicine. Deconstructing Chronic Low Back Pain in the Older Adult—Step by Step Evidence and Expert-Based Recommendations for Evaluation and Treatment. Part VIII: Lateral Hip and Thigh Pain
Meralgia paresthetica is a less well-known condition that causes burning, tingling, or numbness across the front and outer part of the thigh. It results from compression of the lateral femoral cutaneous nerve, a sensory nerve that runs close to the surface near the hip crease.8PubMed Central. Meralgia Paresthetica: Relevance, Diagnosis, and Treatment Tight belts, weight gain, pregnancy, and even prolonged side-lying can compress this nerve. The sensation is distinctly nerve-like, more buzzing or burning than the deep ache of tendon pain, but it can still wake you up when you roll onto that hip. Interestingly, one case report has raised the possibility that meralgia paresthetica can coexist with hip impingement problems, making diagnosis trickier.9PubMed Central. Meralgia paresthetica and femoral acetabular impingement: a possible association
When to Take Hip Pain Seriously
Most lateral hip pain is benign and responds to conservative treatment, but a few scenarios warrant prompt medical attention. A stress fracture of the femoral neck can present as vague, insidious hip pain that suddenly becomes severe. Tension-side stress fractures, on the outer-upper edge of the femoral neck, carry a high risk of displacement, non-union, and damage to the bone’s blood supply, and they typically require surgery.10PubMed Central. Young man with sudden severe hip pain secondary to femoral neck stress fracture If you have a sudden escalation in hip pain, especially after a period of increased running or weight-bearing activity, and the pain is present with weight-bearing and at rest, get imaging rather than assuming it is a soft-tissue problem.
Other red flags include pain that wakes you regardless of position (rather than only when lying on the affected side), unexplained weight loss, fever, or pain that does not improve at all after several weeks of activity modification. These patterns point away from straightforward tendinopathy and toward joint infection, inflammatory arthritis, or, rarely, a bone tumor. You do not need to panic at every ache, but persistent or worsening symptoms that do not fit the typical GTPS pattern deserve a proper examination.
Exercise and Load Management as First-Line Treatment
If your pain fits the GTPS profile, the single best thing you can do is start a structured exercise program focused on progressively loading the gluteal tendons. A systematic review with meta-analysis found that exercise-based interventions, combined with education about how to manage tendon loads, were superior to minimal intervention (like waiting it out) for improving function and reducing symptoms in both the short and long term.11Scientific Reports. Effects of exercise-based interventions on gluteal tendinopathy. Systematic review with meta-analysis Exercise also outperformed corticosteroid injections for overall treatment success at every time point, even though the two approaches reduced pain to a similar degree in the short term.
What does this exercise look like in practice? The programs studied typically combine education about which movements and postures overload the tendon (like standing with all your weight on one hip, or crossing your legs) with a progressive strengthening routine. Load management is delivered in physiotherapy clinics, and the exercises are done both at home and in supervised sessions.12PubMed Central. Exercise and load modification versus corticosteroid injection versus ‘wait and see’ for persistent gluteus medius/minimus tendinopathy (the LEAP trial): a protocol for a randomised clinical trial The core idea is to gradually increase the demand on the gluteal muscles without spiking the compressive load on the tendon. In early stages that might mean isometric holds like standing on one leg with a wall for support. Over weeks, you build toward resisted hip abduction, bridging variations, and eventually more dynamic, functional movements like step-ups and single-leg squats.
A review of gluteal tendinopathy management emphasizes that this condition mostly occurs in midlife in both active and sedentary people, and that it significantly interferes with sleep and everyday weight-bearing tasks.13SpringerLink / Sports Medicine. Gluteal Tendinopathy: A Review of Mechanisms, Assessment and Management The debilitating impact on daily life is exactly why progressive exercise matters so much: it addresses the underlying tendon weakness that sustains the problem, rather than just numbing the pain.
Corticosteroid Injections and Their Limits
Steroid injections into the trochanteric bursa have been a go-to treatment for lateral hip pain for decades, and they do work, at least initially. A randomized trial in primary care found that at three months, about 55% of patients who received a corticosteroid injection had recovered, compared with roughly a third of those who received usual care alone.14PubMed Central. Corticosteroid injections for greater trochanteric pain syndrome: a randomized controlled trial in primary care That is a meaningful short-term advantage. But by twelve months, the gap had closed entirely: about 60% of both groups had recovered, with no significant difference in pain at rest or with activity.
This pattern, a quick boost that washes out over time, shows up repeatedly in the GTPS literature. A general practice review describes the typical management pathway as education, activity modification, pain relief, physiotherapy-led exercise, and corticosteroid injection, with the injection best thought of as a bridge to get you comfortable enough to start rehabilitating the tendon rather than as a standalone cure.15Europe PMC / British Journal of General Practice. Greater trochanteric pain syndrome: a review of diagnosis and management in general practice There is also a concern that repeated steroid injections can weaken tendon tissue over time, although the evidence on that is not as clear-cut as many practitioners suggest. Still, for someone who cannot sleep at all because of hip pain, one well-placed injection can provide enough relief to begin an exercise program, which then delivers the lasting benefit.
Shockwave Therapy
Extracorporeal shockwave therapy (ESWT) delivers acoustic pressure waves into tissue and has gained traction as an option for stubborn tendon problems. A systematic review of studies on hip and pelvic tendinopathies found that ESWT significantly improved pain and functional outcomes across a range of study designs, and that outcomes were often superior to conservative treatments, sham shockwave, ultrasound therapy, and even corticosteroid injection.16PubMed Central. Extracorporeal Shockwave Therapy for Tendinopathies Around the Hip and Pelvis: A Systematic Review A randomized controlled trial comparing focused shockwave therapy to standard ultrasound therapy for GTPS with gluteal tendinopathy showed that the shockwave group had significantly lower pain scores at both two months and six months.17PubMed. Focused extracorporeal shock wave therapy for greater trochanteric pain syndrome with gluteal tendinopathy: a randomized controlled trial
Shockwave therapy is not widely available in every physiotherapy clinic, and sessions can be uncomfortable during treatment. It tends to be considered when exercise rehabilitation and injection have not produced sufficient relief. But the evidence base is growing, and for people who have tried the standard pathway without success, it is worth asking about.
Adjusting How You Sleep
Because nighttime compression on the trochanter is one of the biggest aggravating factors, changing your sleep setup can make a noticeable difference even before any formal treatment kicks in. The simplest adjustment is to stop sleeping on the painful side. If you are a habitual side-sleeper, try lying on the opposite hip and placing a pillow between your knees to keep your pelvis level. Some people find that sleeping on their back with a small pillow or folded towel under the affected hip reduces the ache as well.
Your mattress matters, too. A biomechanical review of mattress design found that surface material and firmness significantly affect how pressure is distributed across bony prominences. Latex mattresses, for instance, reduced peak pressure by up to about 35% compared to standard polyurethane foam in one study, and adding a soft topper helped when multiple body zones showed pressures above a comfortable threshold.18PeerJ. Sleeping mattress determinants and evaluation: a biomechanical review and critique You do not necessarily need a new mattress; a memory-foam or latex topper a few inches thick can soften the surface enough to reduce point loading over the trochanter. The goal is to let the hip sink in slightly rather than pressing hard against a flat, unyielding surface all night.
A few other practical tips that often come up in physiotherapy consultations: avoid crossing the affected leg over the other when lying or sitting, because that position stretches the gluteal tendons over the trochanter and compresses the bursa. If you stand for long periods during the day, avoid resting all your weight on the affected leg. And if you sit at a desk, keep both feet flat on the floor rather than sitting with legs crossed. These small posture tweaks reduce the cumulative tendon load that makes your hip angrier by bedtime.
Hormonal Factors and Tendon Health
The link between estrogen and tendon resilience is an area that gets too little attention in conversations about hip pain. After menopause, declining estrogen levels reduce the body’s ability to maintain and repair collagen, which is the structural protein that gives tendons their strength. The increased prevalence of GTPS in post-menopausal women suggests that hormonal changes are part of the reason the condition appears so frequently in that group.6PubMed Central. Does menopausal hormone therapy (MHT), exercise or a combination of both, improve pain and function in post-menopausal women with greater trochanteric pain syndrome (GTPS)? A randomised controlled trial Researchers have hypothesized that supplemental estrogen through menopausal hormone therapy might help preserve tendon collagen and slow the degeneration process, though this is still an active area of study and not a standard treatment recommendation for GTPS specifically.
What this means practically: if you are a woman in your 40s, 50s, or 60s and you develop lateral hip pain for the first time, know that your tendons may genuinely be more vulnerable than they were a decade ago. That does not mean the situation is hopeless. Progressive strengthening can compensate for the structural changes in the tendon, and many women with GTPS do very well with a consistent rehab program. But it does mean the problem is unlikely to just “go away on its own” the way a minor strain might have in your twenties, and waiting too long to address it tends to make the cycle of pain and sleep disruption harder to break.