Sit Bone Pain That Gets Worse the Longer You Sit

You sit down at your desk and within twenty minutes there is a deep ache right where your body meets the chair. On the drive home it is worse, and a firm car seat is worse than a soft one. You stand up, walk around, and it eases. Then you sit again and it comes straight back.

Running has its own pattern. Flat and easy feels close to fine. Hills hurt. Speed work hurts. The pain sits deep in the lower buttock, close to the bone you sit on, and you can usually point to it with one finger.

That combination usually points to the hamstring tendon where it attaches to the pelvis. It is common and treatable. The reason it drags on for months in so many people is that the obvious response, stretching it out, makes the tendon worse.

What proximal hamstring tendinopathy actually is

Three muscles make up the hamstring group, and they share a common attachment at the bottom of the pelvis on a bony point called the ischial tuberosity. That is the sit bone, the bone you feel pressing into a hard chair. Proximal hamstring tendinopathy is a pain and capacity problem in the tendon at that attachment.

A 2025 clinical commentary in the International Journal of Sports Physical Therapy by Rich, Cook, Hahne and Ford describes the presentation as "localized lower buttock pain with activities including prolonged and hard surface sitting, squatting, and walking uphill or running." The authors call the condition common and disabling, and they note it affects people who do not play sport as well as athletes.

The mechanism that explains the sitting pain is compression. The tendon gets pulled by the muscles below it, and it also gets pressed against the bone it wraps around. The same commentary states that "the location of tendinopathic change in PHT in surgical and imaging studies is adjacent to the PHT insertion at the ischial tuberosity, supporting the hypothesis of compressive forces as a fundamental factor." A tendon that has become irritated and swollen tolerates that pressure less well than a healthy one.

Once you understand compression, the symptom pattern makes sense. Sitting presses the tendon directly. Deep hip flexion, meaning any position that folds you forward at the hip, wraps the tendon tighter around the bone. Uphill running and lunging both put the hip into more flexion under load. Flat walking does almost none of that, which is why walking often feels better than sitting.

Why stretching makes it worse

This is the practical point most people have never been told, so it is worth being blunt about it.

The 2025 commentary lists what raises compression at the sit bone: "compressive load occurs at the ischial tuberosity through activities involving higher ranges of hip flexion, including lunging, kicking, squatting and hamstring stretching, or with direct compression in sitting."

Hamstring stretching is on that list. Every classic hamstring stretch is a deep hip flexion position held for time, which is the definition of a sustained compressive load on an already irritated tendon.

The specific things to stop, at least for now:

• Standing toe touches and seated forward folds, including the hurdler stretch
• Putting the heel up on a bench, chair, or car bumper and leaning over it
• Lying on your back and pulling a straight leg toward your chest with a strap
• Yoga poses that fold you forward over a straight leg, which includes several common ones
• Rolling or digging a lacrosse ball into the sit bone itself

The confusing part is that the stretch feels like it helps, for about twenty minutes. A tendon under stretch gets a short-lived drop in pain sensitivity, so you get relief, you conclude the stretch is working, and you do it again tomorrow. Meanwhile the tendon is compressed daily and never gets the chance to build capacity.

If you have been stretching this for months without resolving it, stopping the stretch is often the single change that lets everything else start working.

How it is told apart from sciatica and other buttock pain

Deep buttock pain has several possible sources, and they need different plans. This is the part of the assessment where an in-person examination earns its keep.

Sciatica and lumbar referred pain. Pain from an irritated nerve root travels. It tends to run down the back of the leg past the knee, and often brings pins and needles, numbness, or weakness. Hamstring tendon pain stays at the sit bone, or spreads a short way down the thigh without that electrical quality. The 2015 review of deep gluteal syndrome in the Journal of Hip Preservation Surgery by Martin, Reddy and Gómez-Hoyos sets the order of operations: rule out spinal causes first through history, examination, and imaging where needed, then turn to the buttock. Our post on sciatica, disc pain and piriformis covers the nerve side.

Deep gluteal syndrome. This is buttock pain caused by the sciatic nerve being compressed or tethered somewhere in the buttock rather than at the spine. It can feel like burning, cramping, or aching, and the same review notes it can mimic a hamstring problem. One useful distinction it describes for hamstring origin tendinopathy is the active hamstring test, where "muscle strength shows marked weakness and pain at 30-degree knee flexion, whereas strength is normal and pain is improved at 90-degree knee flexion." Where the tenderness sits also helps: pain at the sciatic notch points one way, pain at the ischium points another.

Ischiogluteal bursitis. A bursa is a small fluid-filled cushion, and there is one between the hamstring tendon and the sit bone. When the bursa is the main problem, pain is often sharper, more clearly point-tender, and less tied to how hard you loaded the leg the day before. The two structures sit close together and can occur together, which is why a therapist watches how the pain behaves over 24 hours rather than relying on a single test.

A hamstring tear. A strain has a moment. You can name the run, the sprint, the kick. Tendinopathy builds over weeks with no clear injury, or follows a jump in training volume. If your problem started with a sudden painful event, our post on hamstring strain and return to sport is the more relevant one.

Gluteal tendinopathy. Same family of problem, different tendon. That one causes pain on the outside of the hip, over the bony point you lie on, rather than underneath at the sit bone. We cover it in lateral hip pain and gluteal tendinopathy.

No single test settles this. Your therapist builds the picture from where the pain sits, what provokes it, how it responds to load, and how it behaves the next morning.

The staged loading programme

Tendons respond to progressive load. They do not respond to rest, and complete rest tends to leave the tendon weaker and the problem unchanged. The 2025 commentary sets out a five-stage structure, and the stages exist in that order for a reason.

Stage one, isometric holds. An isometric contraction means the muscle works without the joint moving. The commentary describes supine hamstring bridges held for "five repetitions of 30-45 seconds of isometric contraction," with pain allowed up to 4 out of 10 by the second repetition. This settles pain and shows you the tendon can be loaded safely. That second part matters more than people expect, because months of guarding leaves most patients convinced that loading is the enemy.

Stage two, heavier slow strength. This is the main engine of the programme. The commentary describes starting with higher repetitions, around 2 to 3 sets of 10 to 15, then progressing to heavier loads at 4 to 5 sets of 6 to 8 repetitions, with the goal of matching the strength of the unaffected leg. Slow and heavy beats fast and light here. The 2023 systematic review in Sports by Dizon, Jeanfavre, Leff and Norton reached a similar position, giving a Grade B recommendation to progressive loading at a minimum effort rating of 5 out of 10, and finding progressive heavy slow resistance more effective than protocols using eccentric work alone.

Stage three, the rest of the chain. Calf, gluteus maximus, adductors, quadriceps, and control through the lower back and pelvis. The 2023 review gave lumbopelvic stabilisation work a Grade B recommendation when performed at least five days a week. A hamstring tendon that is asked to do the work of the whole posterior chain stays overloaded no matter how much you strengthen it directly.

Stage four, reintroducing compression on purpose. Deep hip flexion comes back here, late and controlled, through movements like modified deadlifts and lunges with the hip angle increased in steps. This is the stage that lets you sit through a flight or lunge for a ball without a flare afterward. Skip it and the tendon stays strong only in the narrow range you trained.

Stage five, energy storage and release. Sprinting, jumping, and sport-specific drills, for people whose lives need them. The commentary applies a tighter pain limit at this stage, 2 out of 10 or less, because these movements provoke the tendon more than anything earlier.

Through all of it, the guide is how the tendon feels the next morning rather than how it feels during the exercise. The commentary tracks latent pain, meaning pain that arrives after the activity is over, across a 24-hour window. Pain that settles back to baseline by the next day means the dose was reasonable. Pain that is still raised the following morning, or that climbs over several days, means the dose needs to come down.

Sitting modifications that actually help

You cannot exercise your way out of eight hours a day of direct compression. Changing how you sit is part of the treatment, and it is the part you can start today.

What tends to help:

• A wedge cushion or a rolled towel placed under the thighs rather than under the sit bones, so weight shifts forward off the tendon. A donut or U-shaped cushion with the cut-out under the sit bone does the same job.
• Raising the seat or tilting it forward so the hip sits higher than the knee. A hard chair with a high seat often hurts less than a deep soft couch, because sinking into soft cushions folds the hip further.
• Standing up on a timer. Short and frequent beats long and occasional, because it is sustained pressure that provokes the tendon.
• In the car, sliding the seat back and reclining the backrest a few degrees opens the hip angle. Long drives are worth breaking up.
• Sitting evenly. Crossing your legs or sitting on a wallet loads one side harder.

What tends to make it worse: low soft seating, bar stools with a forward-leaning perch, long flights without moving, cycling on a saddle that tips you forward into hip flexion, and rowing, which combines deep hip flexion with hard hamstring load.

The test for any of these is whether the pain settles by the next day, which is the same rule that governs the exercise programme.

Why this one is measured in months

Tendons adapt more slowly than muscle. A tendinopathy that built up over three months of increasing training rarely resolves in three weeks of rehabilitation, and expecting it to is how people abandon a programme that was working.

The 2023 review in Sports set a minimum loading duration of 8 weeks, which is a floor. Someone whose pain is limited to long drives and who catches it early may turn the corner faster. A runner who has been symptomatic for a year, has been stretching it throughout, and needs to get back to hill repeats should plan for several months of staged work.

The honest position on the evidence matters here too. A 2021 systematic review in the International Journal of Sports Physical Therapy by Nasser, Vicenzino, Grimaldi, Anderson and Semciw looked across the intervention studies and concluded there is insufficient evidence to recommend any one intervention over another, rating the overall quality of evidence at the lowest grade the system allows, "very low". That same review found corticosteroid injection gave short-term improvement with effects that diminished over time, with 56% of patients reporting no improvement beyond three months.

What that means in practice: treat any programme sold as the proven protocol with caution, and treat an injection presented as the fix the same way. Education and progressive loading are where the field converges. The specific plan should be built around your presentation and adjusted by how you respond.

Progress is also rarely a straight line. Flares happen, usually after a busy week, a long drive, or an enthusiastic session. A flare that settles within a day or two tells you the dose was too high that day.

What a first visit looks like

A first physiotherapy assessment starts with the history, because the pattern carries most of the diagnosis. Your therapist will ask where exactly it hurts, what sitting does to it, whether a hard or soft seat is worse, how long you can drive, what happens on hills and on flat ground, whether anything travels down the leg, and whether there was a single injury moment.

Then the examination: palpation to find whether the tenderness sits at the sit bone, strength testing of the hamstring at different knee angles, screening of the lower back and hip joint, and tests that load the tendon in lengthened positions to see whether they reproduce your pain.

Expect to leave with a small number of exercises. Expect the sitting advice to be specific to your chair, your car, and your working day. Expect a review in a few weeks, because the useful information is in how the tendon responds over time.

Physiotherapy is a direct-access profession in British Columbia, regulated by the College of Health and Care Professionals of BC, so no physician referral is needed to book an assessment. Some extended-health plans require a referral for reimbursement, so check with your insurer before your first visit.

When to see a doctor instead

Book with your physician rather than starting rehabilitation if any of the following apply.

Sudden severe pain during a sprint, a fall, or a water-ski start, especially with bruising down the back of the thigh and difficulty walking, can mean the tendon has torn away from the bone. That needs prompt medical assessment, because a full avulsion is sometimes managed surgically and the timing matters.

Numbness in the groin or genital area, trouble controlling your bladder or bowels, or weakness in both legs needs emergency assessment the same day.

Night pain that wakes you and is unrelated to position, unexplained weight loss, fever, or a history of cancer should be assessed medically before rehabilitation begins. So should buttock pain in a teenager with open growth plates, since the attachment site behaves differently in a growing skeleton. Spreading numbness or growing weakness in the foot or ankle points toward a nerve problem that needs its own assessment.

This article is general information, not personal medical advice. A regulated practitioner can confirm whether the patterns described apply to you.

Frequently asked questions

What is proximal hamstring tendinopathy?

It is a pain and capacity problem in the hamstring tendon where it attaches to the sit bone at the bottom of the pelvis. A 2025 clinical commentary in the International Journal of Sports Physical Therapy describes it as localised lower buttock pain with prolonged or hard-surface sitting, squatting, and walking uphill or running. It affects people who do not play sport as well as athletes, and it can occur on both sides.

Why does it hurt so much when I sit?

Because sitting presses the tendon directly against the bone it wraps around. The 2025 commentary identifies compression at the ischial tuberosity as a fundamental factor, and notes that an irritated, swollen tendon tolerates that pressure less well than a healthy one. This is why a hard chair or a firm car seat is usually worse than a soft one, and why the pain returns within minutes of sitting down again.

Should I stretch my hamstring?

Usually not, at least in the early stages. The 2025 commentary lists hamstring stretching among the activities that increase compressive load at the sit bone, alongside lunging, kicking, squatting, and sitting. A stretch often gives twenty minutes of relief, which is why people keep doing it, and that short-term relief can mask a load that is keeping the tendon irritated. Your therapist will reintroduce deep hip flexion later, as a loaded and controlled progression.

How do I know it is not sciatica?

Nerve-related pain usually travels down the leg and brings pins and needles, numbness, or weakness. Tendon pain stays at the sit bone or spreads a short way down the thigh without that electrical quality. A 2015 review in the Journal of Hip Preservation Surgery recommends ruling out spinal causes first through history, examination, and imaging where needed, then examining the buttock. An in-person assessment is the way to settle this, since the two can overlap.

What is the difference between this and deep gluteal syndrome?

Deep gluteal syndrome is buttock pain from the sciatic nerve being compressed or tethered in the buttock rather than at the spine. The 2015 review notes it can mimic a hamstring problem, and offers the active hamstring test as one differentiator, with marked weakness and pain at 30 degrees of knee flexion but normal strength and improved pain at 90 degrees. Where the tenderness sits also helps, since pain at the sciatic notch and pain at the ischium point in different directions.

Do I need an MRI?

Most people do not. The diagnosis is usually made from the history and physical examination, and imaging findings often do not change the loading plan. Imaging becomes more useful when a tear is suspected, when the presentation is unclear, when symptoms are not improving as expected, or when a red flag needs ruling out. That decision belongs with your physician or your therapist after an assessment.

How long does recovery take?

Plan in months. The 2023 systematic review in Sports recommended a minimum loading duration of 8 weeks, and that is a starting point rather than an endpoint. How long it takes depends on how long you have had it, how irritable the tendon is, what you need to return to, and how consistently the loading is done. Your therapist will give you a more specific range after assessing you.

Can I keep running?

Often yes, with changes. Flat, easy running at a shorter distance loads the tendon far less than hills and speed work, which put the hip into more flexion under load. The guide is how the tendon feels the next morning rather than how it feels during the run. If it has settled back to baseline by the next day, the dose was reasonable.

Do injections help?

The evidence is limited. The 2021 systematic review in the International Journal of Sports Physical Therapy found corticosteroid injection gave short-term symptom improvement with diminishing effect over time, and reported that 56% of patients had no improvement beyond three months. The same review found no significant difference between platelet-rich plasma and autologous whole blood injections on physical function or quality of life. Injection decisions belong with your physician, and the loading work still has to happen either way.

Is complete rest a good idea?

No. Tendons need progressive load to build capacity, and rest leaves the tendon weaker while the problem stays in place. What changes early on is the type of load: sustained compression comes down, isometric holds and slow heavy strength work go up. Reducing aggravating positions while loading the tendon is different from stopping activity altogether.

What if the pain flares up?

A flare that settles back to baseline within a day or two tells you the dose was too high that day. The 2025 commentary tracks pain that arrives after activity across a 24-hour window and uses that to adjust load. Tell your therapist what you did before the flare, since that usually points to the specific change needed.

Do I need a referral to see a physiotherapist in BC?

No. Physiotherapy is a direct-access profession in British Columbia, regulated by the College of Health and Care Professionals of BC, so you can book an assessment without a physician's referral. Some extended-health insurance plans require a referral for reimbursement even though the profession does not, so confirm with your insurer before your first visit.

Sources

• Rich, Cook, Hahne and Ford, "Treatment of Proximal Hamstring Tendinopathy with Individualized Physiotherapy: A Clinical Commentary," International Journal of Sports Physical Therapy, 2025
• Dizon, Jeanfavre, Leff and Norton, "Comparison of Conservative Interventions for Proximal Hamstring Tendinopathy: A Systematic Review and Recommendations for Rehabilitation," Sports, 2023
• Nasser, Vicenzino, Grimaldi, Anderson and Semciw, "Proximal Hamstring Tendinopathy: A Systematic Review of Interventions," International Journal of Sports Physical Therapy, 2021
• Martin, Reddy and Gómez-Hoyos, "Deep gluteal syndrome," Journal of Hip Preservation Surgery, 2015
• College of Health and Care Professionals of BC, physiotherapist scope of practice