Hip bursitis: the outer-hip pain that flares lying on your side.
Sharp pain on the outside of the hip, worse at night, worse on stairs — hip bursitis has a specific pattern. Here's what's actually inflamed, and why the hip is rarely the real cause.
Rolling onto that side at night sends a sharp jolt into the point of your hip. Stairs are worse than flat ground. Getting up from a low chair takes a second of bracing first. That specific pattern — pain right on the bony point of the outer hip — usually isn't a hip joint problem at all. It's a small, overworked cushion doing exactly what happens when it's asked to absorb more friction than it can handle.
What is hip bursitis?
A bursa is a small, fluid-filled sac that reduces friction between tendons, muscles and bone wherever they'd otherwise rub directly against each other. At the outer hip, a bursa sits between the bony point of the hip (the greater trochanter) and the tendons that pass over it. When that bursa becomes irritated and inflamed — from repetitive friction, direct pressure, or altered walking mechanics — the result is trochanteric bursitis, more commonly just called hip bursitis.
What causes it
A few patterns show up again and again:
- Weak hip stabilizing muscles. When the glute medius doesn't hold the pelvis level while walking or running, the tendons crossing the bursa shift and rub with every step.
- Running or repetitive impact on a body that hasn't built up the hip strength to handle the volume.
- Sustained side-sleeping on the same hip, night after night, which keeps direct pressure on an already-irritated bursa.
Hip bursitis vs. piriformis syndrome
These two get confused constantly because both cause pain around the hip and buttock, but they're genuinely different problems. Piriformis syndrome involves a muscle deep in the buttock compressing the sciatic nerve, which often sends pain, numbness or tingling down the back of the leg — a nerve-type pattern. Hip bursitis is more localized directly to the bony point of the outer hip and typically doesn't produce that same radiating, nerve-like symptom pattern. Where the pain sits, and whether it travels down the leg, usually sorts the two apart.
The bursa rarely inflames on its own — it's almost always reacting to a mechanical problem somewhere else, usually a hip that isn't being stabilized the way it should be.
The evidence-based approach
Because weak hip mechanics are usually the real driver, treatment that only calms the bursa without addressing why it got irritated tends to see the problem return:
- Corrective exercise programming targeting the glute medius and hip stabilizers — the piece that actually prevents recurrence
- Pin & Stretch and soft-tissue work on the tensor fasciae latae and IT band, which feed directly into the tendons crossing the irritated bursa
- Precision spinal adjustments to restore symmetric movement through the hips and pelvis, so both sides load evenly
Three things you can do at home
- Sleep with a pillow between your knees. If side-sleeping is unavoidable, this keeps the hips stacked and reduces direct pressure on the irritated bursa.
- Side-lying leg raises. A simple, direct way to start rebuilding glute medius strength — slow and controlled, a few times a week.
- Shorten your stride if you run. A slightly quicker, shorter stride reduces the side-to-side hip drop that aggravates the bursa with every step.
Hip bursitis vs. hip arthritis
These two are also commonly mixed up, but the pain location is different. Hip arthritis typically causes pain in the groin or front of the hip, often with stiffness that's worse first thing in the morning. Hip bursitis is felt directly on the outer, bony point of the hip and doesn't usually come with the same groin-area stiffness. An exam that presses directly on the outer hip versus checking hip joint range of motion can usually tell them apart quickly.
Stairs specifically load the outer hip stabilizers in a way flat walking doesn't, which is why stair pain is such a common early sign of hip bursitis before it's noticeable elsewhere.
We assess and treat hip bursitis at our Cottleville clinic, with a hip-strength evaluation to find out why it started.
Get to the root of it, not just the sore spot.
Frequently asked questions
- What does hip bursitis feel like?
- Sharp or aching pain directly on the outer point of the hip, often worse when lying on that side at night, climbing stairs, or getting up from a low chair. It can sometimes radiate down the outside of the thigh, which occasionally gets mistaken for a hip joint or back problem.
- What causes hip bursitis?
- The bursa is a small fluid-filled cushion that reduces friction between tendons and bone at the outer hip. It becomes irritated and inflamed most often from repetitive friction — running, hip weakness that causes the leg to shift with every step, or sustained pressure from sleeping on that side night after night.
- Is hip bursitis the same as piriformis syndrome?
- No, though they're often confused because both cause pain around the hip and buttock. Piriformis syndrome involves nerve compression from a muscle deep in the buttock and often radiates down the leg like sciatica. Hip bursitis is more localized to the outer point of the hip itself and doesn't typically cause the nerve-type symptoms piriformis does.
- Does hip bursitis go away on its own?
- Mild cases can settle with activity modification and time, but because weak hip stabilizing muscles are usually the underlying driver, bursitis often recurs unless that weakness is actually addressed. That's the difference between temporary relief and actually resolving why it started.
