Bursitis: the swollen cushion at hip, knee, elbow, or shoulder
Last updated September 3, 2026.
A bursa is a small fluid-filled cushion that sits between bone and the soft tissues gliding over it, and bursitis is that cushion getting inflamed and swollen. It produces a localized, tender swelling at predictable pressure points: the outer hip, the kneecap, the elbow tip, the shoulder. Most cases settle with a few weeks of simple measures; the trap to avoid is missing an infected bursa.
What does it look and feel like?
A localized swelling over the point of pressure: a tender goose-egg on the elbow tip, a puffy kneecap, an aching outer hip that protests when you lie on it or climb stairs. The joint behind it usually moves reasonably well (that distinguishes bursitis from joint problems). Pain ranges from an ache on pressure to a sharp protest on movement. The swelling can be dramatic while remaining harmless.
Why does it happen?
Pressure and repetition: leaning on elbows at a desk (student's elbow), kneeling for work (housemaid's knee, now carpet fitter's and gardener's knee), running or a tight iliotibial band for the hip, and overhead work for the shoulder. Direct knocks inflame a bursa immediately. Gout and rheumatoid arthritis inflame them from the inside. And bacteria can infect a bursa through a small skin break: septic bursitis is the version that cannot wait.
What actually settles it?
- Remove the pressure: stop kneeling on it, stop leaning on it, stop lying on the sore hip; cushioning pads for the unavoidable tasks.
- Ice and anti-inflammatories: ice packs 15-20 minutes at a time in the first days, and ibuprofen-type medication if you can take it.
- Keep the joint moving gently: rest the bursa, not the limb; gentle range-of-motion prevents stiffness.
- Hip bursitis specifically: it behaves like a tendon problem and responds to the same physiotherapy: gluteal strengthening plus sleeping position tricks (pillow between the knees, sore side up).
- Stubborn cases: a clinician can drain a tense bursa and inject steroid, effective but done selectively because of infection and recurrence risks.
When is it an emergency?
The infected bursa is the urgent one: a bursa that is red, hot, and increasingly painful, with fever, feeling unwell, or broken skin over it, needs same-day assessment and antibiotics, sometimes drainage. Also prompt: inability to move the joint at all, or bursitis recurring repeatedly, which deserves a look for gout or another driver. Ordinary bursitis without those features is a watch-and-treat-at-home condition. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
How do I know if my bursitis is infected?
Septic bursitis looks and feels different: the skin over the bursa turns red and hot, the swelling becomes steadily more painful rather than just tender, the area may have broken skin (a graze or bite that let bacteria in), and you often get fever and feel unwell. Non-infected bursitis is puffy, tender, and annoying but you feel fine. The red-hot-plus-fever combination needs same-day assessment: infected bursae need antibiotics and sometimes drainage, and delays let the infection dig in.
Will the swelling go away on its own?
Most non-infected bursitis settles over two to six weeks once the pressure or repetitive cause is removed, though a squishy residual lump can linger harmlessly for months at the elbow or knee. The cases that drag on are the ones where the cause keeps happening (still kneeling, still leaning) or where gout or another inflammatory condition is driving it. Recurrent or persistent bursitis is worth a review: sometimes a drainage and steroid injection breaks the cycle, and sometimes a blood test finds the driver.
Is hip bursitis the same as arthritis of the hip?
No, and the distinction changes the treatment. Hip bursitis (trochanteric pain syndrome, now understood as a tendon-and-bursa problem) hurts on the outer point of the hip, when lying on it, climbing stairs, or crossing legs, while hip arthritis hurts in the groin and steals rotation (trouble with socks and shoes). Bursitis-type pain responds to gluteal-strengthening physiotherapy, position changes, and time. Groin-dominant pain with morning stiffness is the arthritis pattern instead.
Should I get the bursa drained or injected?
For most bursitis, no: pressure removal, ice, and time do the job with zero risk. Drainage and steroid injection enter the picture when the swelling is tense and very uncomfortable, when it keeps recurring, or when it has persisted for many weeks despite the simple measures. The reasons it is not the default: any needle introduces a small infection risk into a fluid pocket, steroids have their own local risks, and many drained bursae refill. When infection is suspected, drainage is done to test the fluid, not inject it.
Can I prevent it coming back?
Mostly, yes, because the causes are mechanical: pads for kneeling work and breaks from sustained kneeling, a padded desk edge or a phone-and-desk setup that stops elbow-leaning, a pillow between the knees and the sore side up for hip symptoms, and for shoulder bursitis the same cuff-strengthening program that prevents rotator cuff overload. Recurrent bursitis at the same spot also deserves the gout question (a blood test during a flare) since urate crystals love bursae.
Is bursitis the same as tendonitis?
They are neighbors and frequently co-defendants. The bursa and the tendon gliding over it get irritated by the same overload, so trochanteric bursitis travels with gluteal tendinopathy, and shoulder bursitis travels with rotator cuff tendinopathy, to the point that modern guidance treats them as one regional problem with one exercise-based treatment. The label matters less than the plan: reduce the overload, strengthen the muscles that protect the area, and keep the joint moving.