Sharp Hip Pain When Lying on Your Side? It Might Be Trochanteric Bursitis

You finally settle onto your side at night and a stabbing pain flares along the outer hip, or the same ache shows up climbing stairs or sitting with your legs crossed. That pattern points toward greater trochanteric pain syndrome (GTPS) — what clinicians used to call, more simply, trochanteric bursitis. Older thinking treated this as inflammation of the bursa alone, but modern imaging and histology research has shown that most of the pain generator actually sits in the gluteus medius and gluteus minimus tendons themselves (gluteal tendinopathy), not in bursal inflammation.

This article walks through the anatomy and epidemiology behind GTPS, explains why side-lying is such a reliable trigger, and lays out a home near-infrared (NIR) wellness routine you can run alongside rehab exercises, with concrete numbers for wavelength, dose, and timing.

GTPS is rarely an emergency, but it has a quiet way of grinding down quality of life: you stop sleeping on the painful side, you start avoiding stairs and hills, and overall activity drifts downward — which lets the gluteal muscles get weaker and makes the problem harder to shake. Understanding what is actually happening in the tissue and sticking with an evidence-informed routine is what breaks that cycle. Related reading: shoulder blade pain

Anatomy and Epidemiology of Greater Trochanteric Pain Syndrome

The greater trochanter is the bony knob you can feel poking out on the side of your hip, just below waist level. The gluteus medius and gluteus minimus tendons wrap over it before anchoring into bone, and a handful of bursae — thin, fluid-filled sacs — sit between those tendons and the trochanteric surface to cut down on friction as you walk or roll onto your side. Every step, and every night spent lying on that hip, loads this junction with repetitive compression and shear, and when that load piles up faster than the tissue can adapt, you get inflammation in the bursae and, often at the same time, degenerative change in the tendon fibers themselves.

Anatomists usually split the bursae here into three groups — the subgluteus maximus bursa, the subgluteus medius bursa, and the subgluteus minimus bursa — and which one is involved, or whether the real problem sits at the tendon attachment itself, shifts where the pain sits and how it behaves. Tenderness toward the front and top of the trochanter tends to track with a gluteus minimus insertion problem, while tenderness toward the back and bottom points more toward the subgluteus maximus bursa. In practice, most clinicians now lump all of this together under the umbrella term peritrochanteric pain and manage it as one overlapping problem rather than chasing a single structure.

A cohort study out of Rush University's orthopedic department (Segal et al., 2007, Archives of Physical Medicine and Rehabilitation) found that GTPS shows up in roughly 10 to 25 percent of the general population, with risk climbing sharply in women over 50, people with a history of low back pain, those with coexisting knee osteoarthritis, and anyone carrying a higher body mass index. Women report this condition three to four times more often than men, and the leading explanation is anatomical: a wider pelvis changes the femoral neck-shaft angle and the angle at which the gluteal tendons attach, concentrating more shear stress right at the trochanter with every stride.

Bursitis Might Actually Be Tendinopathy

Fearon and colleagues (2013) compared ultrasound and MRI findings in patients diagnosed with GTPS and found that partial tendon tears, calcification, and abnormal signal in the gluteus medius and minimus tendons showed up far more consistently than bursal swelling or a genuinely inflamed bursa. That finding is a big part of why the field has largely moved away from the term trochanteric bursitis and now prefers greater trochanteric pain syndrome or gluteal tendinopathy — the bursa is often just a bystander, and the tendon is doing most of the complaining.

Why Side-Lying Hurts So Much

Lying on the painful side puts the full weight of the upper leg straight through the trochanter and everything layered over it — the iliotibial band, the gluteal tendons, and the bursae. Add in the way the top leg tends to drift toward the midline when you are lying on your side (hip adduction), and the iliotibial band gets pulled tighter across the trochanter, increasing the compression even further. That is the entire reason clinicians push sleep-position correction — lying on the unaffected side with a pillow wedged between the knees — as a first-line conservative measure rather than an afterthought.

It helps to understand why this particular combination of tendon and iliotibial band creates such a vulnerable pressure point. Most tendons attach to bone at roughly a right angle and rarely take direct external compression — they are loaded in tension, not squeezed. The gluteal tendons at the trochanter are the exception: the iliotibial band runs directly over the top of them like a strap, so every adduction movement is simultaneously a tensile load on the tendon and a compressive load pressing the tendon against bone. Tendons tolerate tension reasonably well but tolerate compression poorly — compressed tendon tissue shifts toward a more cartilage-like, fibrocartilaginous makeup that is weaker and more prone to breaking down. This is the same mechanism seen in other compression-prone tendons, such as the distal Achilles where it wraps around the heel bone. It is also why stretches that add hip adduction, including the standing iliotibial band stretch, tend to aggravate GTPS rather than help it, even though stretching feels like the intuitively right response to a tight, achy area.

Photobiomodulation and Soft-Tissue Research

Several randomized trials have looked at how near-infrared photobiomodulation (PBM) affects tendinopathy and soft-tissue inflammation. A meta-analysis of low-level laser therapy for tendinopathy by Bjordal et al. (2003) found that, within an appropriate dose window (roughly 0.5 to 7.2 J per joint), treated groups showed significantly greater reductions in pain scores and tenderness than control groups — though the authors flagged that results varied considerably depending on wavelength, dose, and exactly where the light was aimed. A separate systematic review of PBM for musculoskeletal pain, published by Stausholm et al. (2019) in BMJ Open, found that studies using doses within World Health Organization guidance showed a statistically significant pain-reduction effect over placebo. Together, these studies suggest NIR light can be a useful supportive tool for local blood flow and cellular metabolism around tendons and bursae, but neither trial targeted GTPS specifically, and large-scale trials on this exact condition are still limited — which is exactly why NIR belongs in the adjunct category rather than as a stand-alone fix.

The exercise evidence is arguably stronger. Mellor et al. (2018), publishing the LEAP trial in the BMJ, randomized 204 patients with chronic gluteal tendinopathy into an education-plus-exercise group, a corticosteroid injection group, and a wait-and-see group, then followed them at 8 and 52 weeks. The education-plus-exercise group reported the highest self-rated improvement at both checkpoints — 78.6 percent at 8 weeks and 83.3 percent at 52 weeks — clearly outperforming the injection group over the long run. The practical takeaway is that NIR sessions layered on top of gluteal strengthening and posture correction are far more likely to produce a meaningful result than NIR used by itself.

Risk Factors and Self-Check Points

The same Segal et al. (2007) analysis flagged a shortened iliotibial band, weak hip abductors, leg-length discrepancy, and reduced gluteal activation from a sedentary lifestyle as additional risk factors. In clinic, this condition shows up constantly in two very different populations: office workers who sit for eight-plus hours a day, and recreational runners logging steady weekly mileage — for opposite reasons. Prolonged sitting lets the gluteal muscles go quiet and the hip flexors tighten, so when you do stand and walk, the glutes fire late and weakly, shifting more load onto the passive structures over the trochanter. Runners, by contrast, load the hip abductors thousands of times per run; without enough strength in reserve, that repetitive eccentric demand outpaces what the tendon can recover from between sessions. Two simple checks help narrow down whether this is what is going on: press firmly on the very top of the greater trochanter and see whether it reproduces the familiar sharp pain, then stand on one leg for 20 to 30 seconds and watch, or feel, whether your pelvis drops on the unsupported side — that drop is a classic sign of hip abductor weakness. Related reading: stretching vs strengthening

NIR Wellness Protocol for the Greater Trochanter

The routine below is meant to run alongside daily gluteal stretching and strengthening work, not instead of it — treat it as a home wellness habit, not a medical procedure. The tissue directly over the trochanter is thin, with very little muscle padding between skin and bone, so the device should rest lightly against the skin rather than being pressed in.

Positioning and Posture

You can find the greater trochanter by lying on your side and feeling for the bony point that presses into the mattress. For the session itself, lie on your unaffected side or on your stomach so the target area is not bearing weight, and hold the device 1 to 3 cm off the skin to avoid stacking local pressure on top of the light. Within a single session, move the device between the center of the trochanter and the 2 to 3 cm of tissue around it so you cover the whole tendon insertion rather than a single spot.

A Routine Worth Pairing With It

First, spend about five minutes before the session on light walking or a gluteal activation drill to get local blood flow moving. Second, right after the session, lie on your side with a pillow between your knees for about ten minutes to keep pressure off the trochanter while the tissue settles. Third, two to three times a week, add an isometric gluteus medius exercise — side-lying hip abduction holds work well — to gradually build the tendon's tolerance for load. For the first one to two weeks, start at the lowest energy density (4 J/cm2), watch how the skin responds, and increase gradually from there.

A Four-Week Routine Combined With Strengthening

In week one, start with isometric side-lying hip abduction — lift the top leg slightly and hold within a pain-free range, two sets of ten — and run the NIR session immediately afterward. In weeks two and three, move up to three sets, add a light resistance band, and raise the energy density into the 6-8 J/cm2 range. From week four onward, add weight-bearing work — single-leg standing, side-stepping — so the tendon gradually adapts to the load it will actually see during normal walking. Throughout this progression, if pain during exercise crosses 3 out of 10, that is the cue to dial the intensity back a notch rather than push through it.

Progression Criteria and Stop Signals

A few concrete markers make it easier to know when to move to the next stage rather than guessing. You are ready to progress when the current week's exercise feels comfortably below a 3/10 pain level for two consecutive sessions, next-morning stiffness has not increased compared with the day before, and you can complete the full prescribed sets without compensating by leaning your trunk toward the unaffected side. Pull back a stage instead if pain during or after exercise consistently sits above 4/10, if soreness that used to settle within an hour is now lingering into the next day, or if you notice new pain radiating down the outer thigh that was not there before — that last sign in particular is worth mentioning to a physiotherapist rather than pushing through on your own timeline.

What Is Worth Logging

Jotting down the wavelength, energy density, session length, and post-session pain score (0-10) after every session makes it much easier to work out, within four to six weeks, which combination actually works for you. It is especially useful to track the pain level right before falling asleep on your side alongside how stiff the hip feels the next morning, since that pairing says a lot about whether sleep quality is genuinely improving. Related reading: NIR light for post-shingles skin healing

When Does Side-Lying Hip Pain Actually Improve

GTPS is usually a mix of an acute inflammatory component and a more chronic tendon-degeneration component, so recovery speed varies a lot from person to person. In the Mellor et al. (2018) LEAP trial mentioned earlier, self-reported improvement in the education-plus-exercise group climbed to 78.6 percent by 8 weeks, which tells you that a realistic goal here is steady improvement over several weeks, not a dramatic turnaround in a few days.

How fast you improve depends heavily on how chronic the pain already is, how much tendon damage is present, and how weak the hip abductors have become, so treat the timeline below as a general guide rather than a promise.

Stage-by-Stage Changes

1. Weeks 1-2: fewer sharp jabs of pain when lying on your side, and the momentary spike of pain climbing stairs starts to ease.
2. Weeks 2-4: the dull ache from crossing your legs or standing for long periods fades, and pressing on the tender point hurts less.
3. Weeks 4-8: if you have kept up gluteal strengthening, the pelvic drop during walking and stair-climbing (a Trendelenburg pattern) improves and walking generally feels steadier.

How to Track It Objectively

Without some kind of number to compare week to week, it is genuinely hard to tell whether you are improving or just having a good day. Record your side-lying pain on a 0-10 visual analog scale at the same time each week, note how much pressing on the top of the trochanter hurts, and re-test single-leg standing balance (30 seconds) every two weeks. If eight weeks of consistent management has not moved your pain score down by at least 2 points, it is time to get an ultrasound or MRI through an orthopedic or rehabilitation medicine clinic to check for a tendon tear.

Long-Term Management to Prevent Recurrence

Even after GTPS settles down, it tends to come back if the underlying sedentary habits or gluteal weakness never actually changed. Keep gluteal strengthening going two to three times a week as a maintenance habit even after the pain is gone, and build in a habit of standing and walking every 30 to 40 minutes during long stretches of sitting. Runners should stick to the rule of increasing weekly mileage by no more than 10 percent rather than ramping training volume back up quickly. Weight management also helps, since it directly reduces the load on the trochanter — Segal et al. (2007) found prevalence climbing with higher body mass index, so weight loss where relevant is reasonable to expect to lower recurrence risk too.

Common Mistakes and How to Correct Them

A handful of mistakes show up again and again in people managing this on their own. The most common is stopping strengthening work the moment the pain fades — the tendon and the muscle both need ongoing load to stay resilient, and dropping exercises the week symptoms improve is one of the strongest predictors of the pain returning within a couple of months. A second common mistake is reaching for a standing iliotibial band stretch because the hip feels tight; as covered above, that stretch adds adduction and compresses the exact structure that is already irritated, so it typically makes things worse rather than better. A third is going back to a full training load all at once after a good week, rather than following the gradual 10 percent rule — a few good days is not the same thing as a fully recovered tendon. A fourth, easy to overlook, is continuing to curl into a fetal position with the knees pressed together out of habit even after starting a pillow-between-the-knees routine; if the pillow slips out overnight, it undoes most of the benefit, so a firmer, larger pillow, or a knee pillow that straps in place, solves this more reliably.

Applying This to Daily Situations

For people who spend the day at a desk, the trochanter takes a quieter but steady beating from sitting itself: a chair set too low, or crossing your legs out of habit while working, holds the hip in exactly the adducted position that compresses the area. Raising the chair slightly so your hips sit a bit above your knees, and keeping your feet flat and shoulder-width apart, removes a meaningful amount of that daily load. In the car, a seat set too low relative to the pedals has a similar effect over a long commute, so nudging the seat height up a notch and avoiding resting an ankle on the opposite knee at red lights both help. Parents who spend a lot of time carrying a child on one hip should try to alternate sides through the day rather than favoring the stronger arm, since carrying a child on one hip pushes that same hip into a sustained hitched, adducted position for long stretches.

Precautions and Differential Diagnosis

Precautions When Using NIR

• Never aim the light directly into the eyes; use protective goggles if needed
• If you are taking a photosensitizing medication (tetracycline-class antibiotics, amiodarone, and similar drugs), check with your physician before use
• Do not use over open wounds, active infection, or active malignancy in the area around the trochanter
• If pregnant, consult an OB/GYN before using the device near the pelvis or abdomen
• Stop immediately if you notice persistent redness, blistering, or itching after a session

When It Might Be Something Else

Outer-hip pain that is worse when lying on your side does not always have the same cause. If any of the following show up alongside it, consider a different diagnosis and see a specialist rather than continuing self-management.

• Deep groin pain, or pain that is worse rotating the hip inward — may point to hip osteoarthritis or a labral injury
• Numbness or a shooting pain running from the low back down the leg — may point to lumbar nerve root involvement (sciatica)
• Fever, or night pain that is rapidly getting worse — could indicate septic bursitis, which needs urgent evaluation
• Pain that started suddenly after a fall or impact and makes it hard to bear weight — needs urgent orthopedic evaluation to rule out a fracture
• Unexplained weight loss, pain that persists at rest and does not ease with position changes, or a personal history of cancer — combined with new hip pain, these warrant prompt medical evaluation to rule out a less common but more serious cause

NIR wellness care is meant to support conservative management and rehab, not replace diagnosis or treatment from a medical professional. If pain persists beyond 8 weeks, or any of the warning signs above show up, see an orthopedic or rehabilitation medicine specialist to pin down the actual cause.

What to Expect at a Clinic Visit

An orthopedic visit typically starts with a history and physical exam — palpation over the tender point, a resisted hip abduction test, the FABER test — to reach a clinical diagnosis, followed by ultrasound or MRI if needed to check the extent of tendon damage and whether the bursa is genuinely inflamed. If conservative management is not enough, an ultrasound-guided corticosteroid injection into the bursa or extracorporeal shockwave therapy (ESWT) are options a physician might raise, and in the rare case of a chronic tear that does not respond to conservative care, arthroscopic repair may be discussed. That said, the Mellor et al. (2018) findings mentioned earlier suggest that education plus exercise tends to outperform injection over the long run, so which option is right for you is worth working out directly with your treating physician. NIR wellness care does not conflict with any of these medical options and can reasonably be used as a supportive routine before or after a procedure as well.