Buttock pain usually comes from one of four places: the muscles and tendons of the buttock itself, the sacroiliac joint at the back of the pelvis, the hip joint, or an irritated nerve in the lower back. All four can feel like a deep ache in roughly the same patch. What separates them is not where the pain sits but what it does. What makes it worse, what eases it, and how far down the leg it travels.

Piriformis syndrome and deep gluteal pain

The piriformis is a small muscle deep in the buttock. It runs from the sacrum, the triangular bone at the base of your spine, out to the top of the thigh bone. The sciatic nerve passes just beneath it, and in some people it passes straight through the muscle.

When the piriformis is tight, irritated or in spasm, it can compress or irritate that nerve.

The pattern is fairly specific. A deep aching in the middle of the buttock rather than at the edges. Worse sitting on a hard surface, worse on a long drive, worse crossing the affected leg over the other. Some people also get tingling down the back of the thigh, and it usually stops above the knee.

Why piriformis syndrome is a contested diagnosis

This is worth saying plainly, because many articles do not. There is no scan or blood test that confirms piriformis syndrome. Imaging is often normal.

Several other structures in that same deep space can produce an almost identical picture: the small rotator muscles beside the piriformis, the hamstring tendons, and scar tissue or bands of connective tissue around the nerve.

For that reason many clinicians now use the broader term deep gluteal pain syndrome. It describes where the trouble is without claiming to know which structure is at fault.

Gluteal tendinopathy: pain on the side rather than the middle

The gluteal muscles attach to the greater trochanter, the bony point you can feel on the side of your hip. When those tendons become irritated, pain sits over that point and can spread down the outer thigh.

The giveaway is lying on that side at night. Stairs are worse, standing on one leg is worse, and sitting with the legs crossed is worse. It is very common in women over 40, and it is often mislabelled as simple hip arthritis.

Hamstring origin tendinopathy: pain right at the sitting bone

The hamstrings attach to the ischial tuberosity, the bone you sit on. Irritation there gives pain in a small, precise spot at the very bottom of the buttock.

It is worse on hard chairs, worse with sprinting or hill running, and worse with deep stretching such as reaching for the toes. It is often managed for months as a hamstring strain that will not settle, when the problem is at the attachment rather than in the muscle belly.

Sacroiliac joint pain

The sacroiliac joint links the base of the spine to the pelvis. When it is the source, people tend to point to it with one finger, just below the belt line on one side.

It is typically worse standing on one leg, rolling over in bed, getting out of a car and climbing stairs. Our page on sacroiliac joint pain goes into more detail.

Referred pain from the lower back

Two structures in the lower back send pain into the buttock. The lumbar facet joints, the small paired joints at the back of each spinal level, refer a dull ache into the buttock and upper thigh.

An irritated nerve root behaves differently. It travels further down the leg, often below the knee, and more often brings pins and needles or weakness. If that is closer to your pattern, our post on what sciatica feels like describes it.

What makes your buttock pain worse, and what that suggests

• Worse sitting on hard surfaces. Piriformis or deep gluteal pain when the ache is mid-buttock. Hamstring origin tendinopathy when it is pinpointed at the sitting bone.
• Worse lying on that side. Gluteal tendinopathy.
• Worse standing on one leg. Sacroiliac joint, or gluteal tendinopathy.
• Worse with stairs. Gluteal tendinopathy, or the sacroiliac joint.
• Worse with prolonged standing. Sacroiliac joint, or the lumbar facet joints.
• Pain travelling below the knee. Points to a nerve rather than a muscle, and is worth having assessed.

How to stretch the piriformis, and when not to

For muscle-driven pain, gentle stretching of the piriformis and the deep hip rotators often helps. The common positions are the figure-four stretch lying on your back, and a seated version with the ankle resting on the opposite knee. Move in slowly and hold at mild tension, never into pain.

Two honest cautions. Aggressive stretching frequently makes gluteal tendinopathy worse, because pulling the leg across the body presses the irritated tendon against bone. And pain travelling down the leg is a signal to get assessed rather than to stretch harder.

Strengthening the hip and changing how long you sit in one position usually does more than stretching on its own.

What treatment looks like

Load and sitting changes. Break up long periods of sitting, adjust the seat on long drives, and pause the one or two activities that reliably flare it.

Physiotherapy. Graded strengthening for the hip and trunk is the mainstay for muscle and tendon causes. Our physiotherapy and chiropractic teams work alongside our physicians.

What an interventional pain clinic adds. Image-guided injections under ultrasound place medication precisely into an affected tendon or bursa. Sacroiliac joint injections are used when that joint is suspected. Diagnostic nerve blocks use a small amount of local anaesthetic to test whether one particular structure is producing the pain, which helps direct longer-acting treatment.

Warning signs that need urgent care

Most buttock pain is not dangerous. Seek urgent medical care if you have:

• Numbness in the groin or saddle area, the part that would touch a bicycle seat
• New difficulty controlling your bladder or bowels
• Leg weakness that is getting worse
• Buttock pain with a fever or feeling generally unwell
• Pain in the buttock following significant trauma such as a fall or a collision
• Unexplained weight loss alongside the pain
• Pain that is constant and not relieved by any position

Questions patients ask about buttock pain

Why does my buttock hurt when I sit?
Sitting compresses the deep buttock. A hard seat presses the piriformis and the sciatic nerve together, and it also loads the hamstring attachment at the sitting bone. Mid-buttock aching points more toward deep gluteal pain, while a small sore spot right on the bone you sit on points toward the hamstring attachment.

Can buttock pain radiate down the leg?
Yes, and how far matters. Deep gluteal and piriformis-related pain often sends tingling into the back of the thigh that stops above the knee. Pain and pins and needles travelling below the knee, especially into the calf or foot, suggest a nerve root in the lower back instead and are worth an assessment.

Should I stretch buttock pain or rest it?
It depends on the cause. Muscle-driven deep gluteal pain often eases with gentle stretching and hip strengthening. Tendon pain on the side of the hip usually responds badly to stretching and better to graded loading. If stretching consistently makes things worse over a week or two, stop and get it looked at.

How long should buttock pain last before I see someone?
A few weeks of gradual improvement is reassuring. Pain that has lasted beyond about six weeks, keeps coming back, wakes you at night, or is limiting walking and sitting deserves a proper assessment. Any of the warning signs above should be checked the same day rather than waited out.

This article is general information, not medical advice. It cannot diagnose your pain. If your symptoms are new, worsening, or worrying you, speak with your family doctor or contact us for an assessment.

Getting buttock pain assessed

If the pain has lasted more than a few weeks or is changing what you can do, an assessment can work out which structure is involved rather than leaving you to guess. Our pain physicians in Toronto examine the hip, the pelvis and the lower back together, because the buttock receives pain from all three.

Most services are covered by OHIP with a physician referral, which your family doctor can send through our physician referral page. You can also refer yourself directly without waiting for a doctor’s appointment.