What is bursitis — and why does it matter which type you have?
The word “bursitis” alone tells you little, because it may conceal at least four very different stories: the mechanical, friction-and-pressure-related form (the tiler's knee, the student who leans on their elbows); a crystal-related (gout) attack; bursitis accompanying rheumatic disease; and — the most important exception — infectious (septic) bursitis, which does not need a compress but antibiotics. This article shows what is typical at each site, how to tell the different forms apart, what you can do at home, and when you need to see a doctor immediately.
Key point
Two questions decide almost everything in bursitis. The first is: is the bursa infected? Superficial bursae — those in front of the kneecap and over the tip of the elbow — can easily become infected through a break in the skin. If the swelling is hot and red, and is accompanied by fever or feeling unwell, septic bursitis must be suspected. This needs urgent medical care, including aspiration and antibiotics. The second question is: what is keeping it going? A bursa rarely becomes inflamed “by itself”. Usually there is ongoing pressure, friction-related overload, tendon disease or “crystal disease” behind it. Until you deal with the cause, the bursitis may keep returning, however often you reduce the swelling.
The four causes — and the typical sites
Open the individual tabs for details:
The most common form is mechanical: prolonged pressure or repeated friction — the tiler or gardener who spends all day kneeling (“housemaid's knee”), the office worker or student leaning on a desk, or a heel bursa rubbing against a hard shoe heel.
The second is the overload-related accompanying form: the bursa becomes inflamed alongside disease in a nearby tendon — in the shoulder, the rotator cuff tendon; around the hip, disease of the gluteal tendons “takes the bursa along with it”.
The third is crystal-related: in gout, uric acid crystals may also deposit in the bursa — the tip of the elbow is a favourite site.
The fourth is an underlying inflammatory disease: in rheumatoid arthritis and similar conditions, the bursae become inflamed as part of the disease.
That is why every persistent or recurrent case of bursitis starts with the same question: what is behind it?
Superficial bursae — those in front of the kneecap and over the tip of the elbow — lie directly beneath the skin. Bacteria can therefore enter through an abrasion, small wound, corn or eczema; Staphylococcus aureus is responsible for the large majority of cases.1
The problem is that infected and non-infected bursitis can look similar at first glance — both are swollen and painful — but their treatment is completely different. Septic bursitis requires targeted antibiotics and often aspiration of the fluid. If treatment is delayed, the infection may spread to the surrounding tissues and bloodstream.
So the rule is: hot, red, tense swelling + fever, feeling unwell, or a wound over the swelling = see a doctor that same day. The question is usually settled by examining the aspirated fluid.1 What you must NEVER do at home: squeeze, puncture or “pop” the swelling.
Pain on the outer side of the hip — sometimes so painful that you cannot sleep on that side — was called “trochanteric bursitis” for decades, and many people still know it by that name. Modern imaging research has shown, however, that in most cases the bursa is not the primary problem. It is the attachment tendons of the gluteal muscles (gluteal tendinopathy); the bursa may swell only as a secondary feature. This changes the treatment: tendon-related pain improves with load management and targeted strengthening exercises — I show the evidence in the research section — while the “bursitis logic” of rest plus injection gives weaker long-term results.2 The broader lesson is this: whenever bursitis is diagnosed, it is worth looking behind it to find the real main problem. The complete map of hip pain: Causes of hip pain →
Common sites — features and what to do
| Site | Typical picture and cause | What should you watch for? |
|---|---|---|
| In front of the kneecap (“tiler's knee”) | Soft, fluctuant swelling over the kneecap — frequent kneeling (tiler, gardener, mechanic) | Superficial bursa: risk of infection! Use knee protection and stop kneeling for a while; if it is hot and red, see a doctor. It must be distinguished from other causes of knee swelling: Knee map → |
| Tip of the elbow (“student's elbow”) | Golf-ball-sized, well-defined swelling on the point of the elbow — leaning on the elbow, impact or gout | Also superficial: aspiration helps decide if infection or gout is suspected; use an elbow pad and avoid leaning on the elbow |
| Outer side of the hip | Painful over the greater trochanter when lying on the side or climbing stairs — usually originating from the gluteal tendon (see above) | The basis of treatment is a gradual strengthening programme, not an injection2 |
| Shoulder (subdeltoid bursa) | Pain when raising the arm, a “painful arc” — accompanying rotator cuff tendon overload | Shoulder symptoms are rarely “just bursitis”: Causes of shoulder pain → |
| Heel (bursae beside the Achilles tendon) | Swelling at the back of the heel, worse in hard shoes — often associated with a Haglund deformity | Change shoes and raise the heel; the condition of the Achilles tendon is key: Achilles → |
| Ischial tuberosity (“tailor's bottom”) | Pain over the sitting bone — work involving sitting on hard surfaces, cycling | Use a seat cushion and change your weight-bearing position; persistent cases need assessment |
What can you do at home — for the aseptic, mechanical form?
If there are no signs of infection (no fever, heat, spreading redness or wound), you can start treating mechanical bursitis at home:
| What to do | How? |
|---|---|
| 1. Remove the causative pressure | This is half the treatment: kneel with knee protection or take a break from kneeling, use a cushion when leaning on the elbow, a seat cushion and wider shoes. Without this, everything else is only treating the symptoms. |
| 2. Cooling in the acute phase | Several times a day for 15–20 minutes, through a towel — to reduce swelling and pain during the first few days. |
| 3. A short course of anti-inflammatory medicine | If needed, following the advice of your pharmacist or doctor — as a bridge, not for months. |
| 4. Keep moving | Move the neighbouring joint through its range every day, within the pain limit — complete rest causes stiffness, especially in the shoulder. |
| 5. Treat the underlying cause | For tendon-related forms, use a gradual strengthening programme (for the hip, this is the main treatment2); for gout, bring the uric acid level under control: Gout → |
| 6. Additional physiotherapy | During the resolving but more persistent phase, soft laser and TENS may be used as additional treatments for pain — about the methods: Which technology is used for what? → |
If there is no meaningful improvement after 1–2 weeks of consistent unloading, or the swelling returns, the next step is to see a doctor: ultrasound, aspiration of the fluid if needed (this is both treatment and diagnosis — the fluid shows whether crystals or bacteria are present1), and targeted treatment of the underlying cause.
Red flags — when should you not treat it at home?
- Hot, red, tense swelling + fever, chills or feeling unwell – suspected septic bursitis: see a doctor that same day; the infection may spread to the surrounding tissues and bloodstream. The aspirated fluid will settle the question.
- Wound, abrasion or eczema over the swelling – an entry point for bacteria: medical assessment is needed because of the infection risk, even if there is no fever (yet).
- Diabetes, weakened immune system, steroid or immunosuppressive treatment – the risk and severity of septic bursitis are higher; in these patients, bursitis should be treated as a medical problem from the outset.
- Squeezing or puncturing the swelling at home – forbidden: sterile aspiration is a medical procedure; home “popping” may introduce infection into the bursa.
- Recurrent swelling or swelling that has lasted for months – the underlying cause needs to be investigated (gout, rheumatic disease, tendon damage, rarely something else): blood tests, ultrasound and a rheumatology assessment may be needed. Joint pain map →
- Repeated steroid injections into superficial bursae – injections into the prepatellar and olecranon bursae carry a risk of skin atrophy and infection, while for the hip they give weaker long-term results than exercise2,3 — ask about alternatives: Steroid: friend or foe? →
What does the research say? Based on readers' questions
“How does the doctor know whether my bursa is infected?”
Often, the doctor cannot tell just by looking either — and according to the literature, a decision should not be based on appearance alone. A review on treating septic bursitis states that distinguishing infected from non-infected superficial bursitis (at the elbow and in front of the kneecap) usually requires testing the aspirated contents: cell count, crystals and culture. The pathogen is Staphylococcus aureus in roughly 80% of cases. Ultrasound is useful both for diagnosis and for guiding aspiration. Treatment of the infected form is targeted antibiotics, with repeated aspiration if needed, and surgery only in selected cases.1 The important point for you is this: “we will aspirate it and examine it” is not excessive caution but the proper approach — and the earlier it is done, the simpler the treatment.
“They told me I have bursitis in my hip. Injection or exercise?”
The best-quality study has answered this question. In the Australian LEAP trial, 204 people with outer hip pain (with MRI-confirmed gluteal tendon disease) were assigned to three groups: education on load management plus an 8-week exercise programme, a single steroid injection, or “wait and see”. At eight weeks, 77% of the education-plus-exercise group reported meaningful improvement, compared with 58% of the injection group and 29% of the waiting group. One year later, the exercise group's advantage over the injection group remained (78% vs. 57%).2 The message is clear: for “hip bursitis”, a gradual strengthening programme provides the lasting solution; an injection may bring quicker initial relief, but by one year it falls behind. This also fits the broader lesson that steroid injections can be helpful in the short term for tendon-related complaints but often lead to worse outcomes in the long term.3
“They aspirated it, but it filled up again. What does that mean?”
It can mean two things, and both can be addressed. The first and more common is that the cause — kneeling, leaning on the elbow, friction or gout — is still active, so the bursa continues to produce fluid in response to the ongoing irritation. In this situation, the answer is not another aspiration but removing the cause (protective equipment, changing the way you work, or bringing uric acid under control). The second possibility is that the bursal wall has become chronically thickened. In a bursa that has been present for months and repeatedly refills, sclerotherapy or surgical removal (bursectomy) may be considered. The body then forms a thinner, healthy gliding surface.1 The good news is that only a small proportion of patients reach this stage — for most, removing the pressure plus one or two aspirations resolves the problem.
Frequently asked questions
The location and movement pattern help. In bursitis, the swelling lies OUTSIDE the joint and is well defined (in front of the kneecap or on the tip of the elbow). Usually, only certain movements or pressure are painful; other movements remain free. With arthritis, the joint itself is swollen, movement in every direction is painful and restricted, and morning stiffness is common. A reliable distinction is a medical task (ultrasound), but these two patterns are a useful starting point: Joint pain – map →
In the acute phase, when the swelling is enlarged and warm to the touch, use cold (15–20 minutes through a towel, several times a day). During the resolving, more chronic phase, when the area is mainly tense and stiff, warmth is more pleasant and helps relax the tissues. There is one exception where neither is appropriate: if the swelling is hot and red and accompanied by fever, do not apply compresses. See a doctor, because a compress does not treat infection — it only wastes time.
Fresh mechanical bursitis usually settles within 1–3 weeks once the pressure is removed. The swelling may take longer to disappear than the pain, which is not a problem in itself. Septic bursitis also heals over several weeks with antibiotics if treatment starts in time. If it drags on for months, it almost always means that the cause (kneeling, tendon disease or gout) is still active. In that situation, you do not need more patience but an investigation into the underlying cause.
In the acute phase, the best approach is to minimise kneeling even with protection — the inflamed bursa may find reduced pressure too much. After recovery, however, good-quality knee protection lined with gel or foam, together with frequent changes of position, is the basis of preventing recurrence in kneeling professions. The same principle applies to leaning on the elbow (use a cushion) and seated work (use a seat cushion). Bursitis follows the “rules of tool use”: a few pounds spent on padding can prevent something that would otherwise need weeks of treatment.
This is common and usually harmless. After the inflammation has settled, the bursal wall may remain thickened and feel slightly firm, especially over the tip of the elbow. It needs attention if the lump grows, becomes painful again, turns red, or interferes with movement or work. In that case, an ultrasound check is appropriate. In someone with gout, a hard lump around the elbow may also be a uric acid deposit (tophus) — an indication to bring the uric acid level under control: Gout →
Summary – Quick overview
Sources
- Lormeau C, Cormier G, Sigaux J, Arvieux C, Semerano L. Management of septic bursitis. Joint Bone Spine. 2019;86(5):583-588. DOI: 10.1016/j.jbspin.2018.10.006
- Mellor R, Bennell K, Grimaldi A, et al. Education plus exercise versus corticosteroid injection use versus a wait and see approach on global outcome and pain from gluteal tendinopathy: prospective, single blinded, randomised clinical trial (LEAP). BMJ. 2018;361:k1662. DOI: 10.1136/bmj.k1662
- Coombes BK, Bisset L, Brooks P, Khan A, Vicenzino B. Effect of corticosteroid injection, physiotherapy, or both on clinical outcomes in patients with unilateral lateral epicondylalgia: a randomized controlled trial. JAMA. 2013;309(5):461-469. DOI: 10.1001/jama.2013.129
