Hip Pain When You Lie on Your Side: Managing Greater Trochanteric Pain Syndrome

If lying on your side sends a sharp ache into the point of your hip, and climbing stairs or standing at the sink for ten minutes leaves the outer hip throbbing, you may be dealing with greater trochanteric pain syndrome (GTPS). For decades this was filed under one label, hip bursitis, but imaging and pathology work over the past fifteen years has shifted that picture. In most people who fit this pattern, the bursa itself turns out to be a minor player. The real driver is degeneration of the gluteus medius and gluteus minimus tendons where they anchor onto the trochanter, a condition better described as gluteal tendinopathy.

This article walks through why GTPS develops, who tends to get it, and how a near-infrared LED wellness device can fit alongside exercise and posture correction, based on the research literature on the condition. NIR light is a conditioning aid, not a treatment for tendon disease. Any suspected tendinopathy or bursitis should be evaluated by an orthopedic specialist or physical therapist.

The Anatomy Behind Greater Trochanteric Pain Syndrome

The greater trochanter is the bony knob that juts out from the top of the femur, the part you can feel with your hand on the side of your hip when you lie down. Two muscles attach their tendons here: the gluteus medius, and the smaller gluteus minimus underneath it. A bursa, a fluid-filled sac that reduces friction, sits over the tendons at this junction. Every movement that stabilizes the pelvis from the side, walking, climbing stairs, standing on one leg to put on socks, loads these tendons continuously.

From Bursitis to a Tendon-Centered Model

A study by Fearon and colleagues at La Trobe University (2013) used MRI to examine patients diagnosed with GTPS and found that in the majority of cases, the dominant finding was not bursal inflammation but partial tearing and degenerative change in the gluteus medius and minimus tendons. That single piece of imaging work reshaped how clinicians think about the condition. Current practice guidelines now treat GTPS as a broader pain syndrome that includes gluteal tendinopathy, rather than a simple case of bursitis.

Why Certain Positions Hurt More

Because the tendons wrap directly over the bone as they run to their attachment point, any position that compresses them against that bony surface increases mechanical stress. Standing with the weight shifted onto one hip, so the pelvis drops on the opposite side, sitting with the legs crossed, and lying on the affected side all push the tendon into the bone underneath it. Repeat that compression enough times and the collagen fibers inside the tendon start to fray at a microscopic level, the beginning of the slide toward tendinopathy.

How Common It Is, and Who Is at Risk

A community-based cohort study by Segal and colleagues (2007), drawn from the Johnston County Osteoarthritis Project, found GTPS symptoms in roughly 15% of the adults studied, with women affected about four times as often as men. Risk rose significantly in postmenopausal women, in people who also had knee or low back pain, in those with a higher body mass index, and in anyone already managing low back pain or knee osteoarthritis. Leg-length discrepancy, pelvic asymmetry, and lower-limb alignment issues also add extra load to the tendon over time.

Why It Is So Common After Menopause

Several explanations have been proposed for why women develop GTPS so much more often than men. One is biomechanical: a proportionally wider pelvis means the femur meets the hip socket at a steeper angle, a larger neck-shaft angle, which increases the relative load the gluteus medius has to generate with every step. The other is hormonal. Falling estrogen after menopause affects collagen turnover in tendons and connective tissue generally, which may lower the tendon's tolerance for repeated load.

A Common Misconception: It Does Not Take a Full Tear to Hurt This Much

Gluteal tendinopathy does not mean the tendon has torn all the way through. It describes disorganized collagen fibers and an accumulation of microscopic damage, a process rather than a single injury. The severity of pain also does not reliably track with how dramatic the tendon looks on ultrasound or MRI. Plenty of people with significant imaging changes have mild symptoms, and the reverse happens too. A review by Grimaldi and Fearon (2015) proposed treating GTPS as a composite lateral hip pain syndrome, covering the tendinopathy itself, the trochanteric bursa, and friction from the iliotibial band, rather than chasing a single diagnostic label. In practice, that means the posture and movement patterns driving the pain matter more than which exact tissue lights up on a scan.

The Iliotibial Band Connection

The iliotibial band, a thick strip of connective tissue running from the pelvis to just below the knee, passes directly over the greater trochanter. With every step, it slides slightly forward and back across the bone. When it is chronically tight, that sliding creates extra friction right where the gluteal tendons already sit under stress, which is why gluteal tendinopathy management usually includes attention to the tensor fasciae latae, the muscle that tensions the IT band, alongside direct glute strengthening.

Why This Particular Spot: The Compression-Plus-Tension Problem

The mechanism at play here has a name in tendon research: compressive tendinopathy. Most people picture tendon injury as pure overstretching, a tensile problem. What happens at the greater trochanter is a mix of both. The gluteus medius and minimus tendons are pulled taut by muscle contraction while simultaneously being pressed against the underlying bone, the same combined load pattern seen in shoulder impingement or in Achilles insertional tendinopathy against the heel bone. Tendon tissue tolerates pure tension reasonably well but responds poorly to sustained compression, which is why a position that seems harmless, resting on one hip while doing dishes, or sleeping on the painful side night after night, can do more damage over months than a single hard workout.

Tendon researchers also describe this kind of injury as a continuum rather than a fixed state: an early reactive phase where the tendon thickens and becomes irritable in response to a sudden load spike, a middle phase of disrepair where the fiber structure starts to break down, and a later degenerative phase with more permanent structural change. Where you sit on that continuum changes what actually helps. A reactive tendon usually needs relative rest from compressive positions first, while a more degenerative tendon tends to respond better to progressively loaded strengthening than to rest alone. This is one more reason a physical therapist's hands-on assessment is worth the appointment before committing to a long exercise program on your own.

NIR Wellness Care Alongside an Exercise-Based Routine

Clinical guidelines for GTPS center on load management and targeted gluteal strengthening. A near-infrared LED device can be layered onto that routine afterward, as a way to support muscle recovery and conditioning. The example flow below assumes use of a CIRIUS healthcare device. Actual intensity and frequency should be adjusted to your own pain level and response.

A Phase-Based Approach

Application Order and Placement

First, lie on your side with the affected hip supported so the trochanter itself is not being pressed into the mattress. Next, hold the device within about 3cm of the area, or in light contact. Afterward, follow with gentle stretching that does not involve shifting your full weight onto the opposite hip. NIR exposure itself is meant to support muscle relaxation and local circulation. The structural repair of tendon tissue depends on progressive loading through exercise, not on light exposure alone, and it is worth keeping that distinction in mind so the device does not become a substitute for the harder work of strengthening.

Lifestyle Adjustments Worth Making Alongside This

If you sleep on your side, put a pillow between your knees so the pelvis does not drop inward, and avoid sleeping on the painful side when you can. If your job has you standing for long stretches, watch for the habit of shifting all your weight onto one leg, a posture sometimes called hanging on one hip, and consciously redistribute the load. Sitting with your legs crossed adds the same kind of compressive stress and is worth cutting back on. If neck and shoulder posture also need attention, the office worker neck pain relief guide covers that ground.

Why Placement Matters More Than People Expect

NIR's photobiomodulation effect works on local blood flow and cellular metabolism at the site of exposure. For that reason, aiming the device directly over the bony point of the trochanter is less useful than covering the muscle belly around it, the gluteus medius and minimus tissue slightly above and around the hip, roughly a palm's width of coverage. The bony prominence itself is sensitive to pressure, so holding the device a short distance off the skin there tends to feel more comfortable than pressing it firmly against the bone.

An Example Exercise Routine (Use Under Professional Guidance)

Every exercise should stay inside a pain-free range, and if discomfort climbs to 3-4 out of 10 during or after a set, that is the signal to scale back. A physical therapist's individual assessment is the safest way to design this kind of program. Exact intensity and sequencing will vary with your pain pattern and how the tendon responds.

How to Tell When You Are Ready to Progress

A useful rule of thumb from tendon rehab: pain during a set of up to 3-4 out of 10 that settles back to baseline within 24 hours is an acceptable working range. Pain that is still elevated the next morning means the previous session's dose was too much, not that the exercise itself is wrong. Most people spend two to three weeks at a given rep range and resistance level before adding load. Trying to progress faster than the tendon can adapt is one of the more common ways this drags on longer than it should. Signs you are ready to add resistance or reps: the current level feels easy rather than fatiguing by the last few reps, next-day soreness has stopped, and single-leg standing time has visibly improved. Signs to back off instead: pain lingering past 24 hours, a new ache appearing in a different spot, or night pain returning after it had settled.

The Mistake Most People Make With Hip Abduction

The single most common technique error in side-lying hip abduction is letting the hip roll forward and lifting the leg toward the ceiling rather than straight out to the side. Done that way, the tensor fasciae latae, the muscle that tightens the IT band, takes over the work instead of the gluteus medius, which both defeats the point of the exercise and can aggravate the IT band friction described earlier. The fix is simple but easy to forget under fatigue: keep the hip stacked directly over the other hip, toes pointed forward, and lift only as high as you can without the pelvis rocking backward. Doing the movement slowly in front of a mirror for the first few sessions is usually enough to correct the pattern.

What to Expect When Exercise Is Part of the Plan

The intervention with the strongest evidence behind it for GTPS is targeted exercise therapy. Mellor and colleagues in Melbourne (2018) published a large randomized controlled trial in The BMJ, the LEAP study, that split 204 GTPS patients into three groups: an education-plus-exercise program, a corticosteroid injection, and a wait-and-see control, then compared outcomes at 8 weeks and again at 1 year. The education-and-exercise group showed the clearest pain reduction and functional improvement at both checkpoints. The injection group did well at 8 weeks but had a higher relapse rate by the 1-year mark than the exercise group. This trial is one of the most cited pieces of evidence for treating GTPS with exercise as a long-term strategy rather than reaching for a quick fix.

What Changes, Stage by Stage

1. Early (weeks 1-2): Avoiding the postures that provoke pain, side-lying on the affected hip, hanging on one hip while standing, combined with NIR sessions tends to ease muscle tension enough that night-time pain wakes you up less often.
2. Middle (weeks 3-6): This is when you are building up reps in the gluteal strengthening work: abduction, clamshells, bridges. Most people notice they can stand on one leg longer and that stairs feel less uncomfortable during this window.
3. Longer term (8+ weeks): As in the Mellor (2018) trial, the group that stuck with exercise consistently saw longer-lasting pain reduction and fewer relapses. By this stage it is reasonable to taper NIR use down to a 2-3x weekly maintenance schedule.

Tracking Your Own Progress

Keeping a simple weekly log, a pain score while lying on the affected side on a 0-10 scale, how long you can balance on one leg, and how uncomfortable stairs feel, gives you an objective way to see whether the plan is actually working, rather than relying on how any one day happens to feel.

Why an Injection Is Not Always the Answer

Corticosteroid injections quickly reduce inflammation and pain in the short term, which is why they are used so often in clinical practice. But as the LEAP trial showed, injection alone underperformed the education-and-exercise group at the one-year mark, and there is ongoing concern that repeated injections may weaken tendon tissue over time. That is part of why more recent clinical guidelines tend to position injections as a secondary option, useful when exercise alone has not produced enough progress, rather than a first-line choice.

The Role of Body Weight and Leg Alignment

As the Segal (2007) cohort found, a higher body mass index raises the risk of developing GTPS, likely because added weight increases the compressive load on the tendon at the trochanter with every step. For that reason, weight management, shoe inserts to correct a leg-length difference, and correcting a Trendelenburg gait pattern, where the pelvis dips side to side while walking, are often folded into a long-term management plan alongside the exercise program itself.

Small Everyday Movements That Add Up

A handful of habits that look trivial in isolation, twisting on one leg while climbing out of a car, always slinging a heavy bag over the same shoulder or hip, sitting sideways on a low, soft couch to watch TV, create cumulative load at the trochanter when repeated daily. During a painful flare, it is worth going through these one by one and finding an alternative way to do each.

Applying This at a Desk, Behind the Wheel, and With Kids

At a desk, a low chair or a habit of sitting with one ankle crossed over the opposite knee, a common figure-four sitting posture, puts the outer hip into a stretched, compressed position for hours at a stretch. It is worth swapping for feet flat on the floor and hips level. Behind the wheel, a seat set too low relative to the pedals forces a similar hip angle for a long commute. Raising the seat height slightly and using a small lumbar or hip wedge can reduce the load. Picking up and carrying a young child on one hip, the classic hip carry, repeatedly loads that side's gluteal tendons in exactly the compressive position that aggravates GTPS. Alternating sides deliberately, or using a front-carrier that distributes weight more evenly, makes a real difference for parents managing this condition through a period of frequent lifting.

Postures to Avoid and When to See a Specialist

Habits That Tend to Make This Worse

• Sleeping on the painful side (put a pillow between the knees when lying on the other side to keep the pelvis aligned)
• Standing for long periods with weight shifted onto one leg
• Sitting with the legs crossed, or perching sideways on a low sofa
• Aggressive stretching that repeatedly lengthens the tendon over the trochanter, which can increase compressive stress rather than help

Precautions for NIR Use

• Never aim the device directly at the eyes; use protective goggles if needed
• If you are taking a photosensitizing medication, such as a tetracycline-class antibiotic or amiodarone, check with your prescribing physician before use
• Stop immediately if you notice redness, blistering, or any other skin reaction
• During pregnancy, avoid irradiating areas near the abdomen and check with a professional before use

Signs You Should See a Specialist

Get an orthopedic or physical therapy evaluation before continuing with self-management if any of the following apply: pain has not improved after three or more weeks of consistent effort; the pain is severe enough to wake you at night; you notice numbness, tingling, or other sensory changes down the leg; the pain started after a fall or other trauma; or it is accompanied by fever or unexplained weight loss, which point toward something other than a mechanical tendon problem and need medical attention regardless of how the hip itself feels. NIR wellness care is a conditioning aid at best. It is not a substitute for diagnosis or an assessment of structural tendon damage.

Long-Term Habits That Prevent Relapse

A drop in pain does not necessarily mean the tendon has returned all the way to normal, so rather than stopping gluteal strengthening completely once symptoms ease, continuing with a 2-3x weekly maintenance version of the exercises helps prevent relapse. If your job keeps you on your feet for long stretches, or you walk or run regularly, it is worth periodically checking your alignment and your habit of favoring one leg, along with the wear pattern on your shoe soles and the surfaces you are walking on. A road with a persistent camber or a regular downhill route both load one hip more than the other.

Ice or Heat: How to Choose

Right after a sharp flare-up, say, the evening after a long day of walking, icing the area can help settle the acute irritation. On days when the main complaint is stiffness rather than a sharp flare, heat or a warmth-based approach like NIR tends to suit muscle relaxation better. This is a general pattern rather than a fixed rule, though. It is fine to go with whichever, ice or heat, feels more comfortable for your own response.