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Usually Harmless. Occasionally Infected. Four Signs Tell You Which.
A soft, squashy lump on the point of the elbow is usually olecranon bursitis: a small fluid sac that has filled up from pressure or a knock. Most settle over 2 to 6 weeks once you stop leaning on it and pad it, with no draining needed. The exception is infection. A hot, red, painful lump, a break in the skin, or a fever needs a doctor TODAY, cos that one needs antibiotics.
It appeared on the pointy tip of your elbow, somewhere between a golf ball and an egg, and it looks far worse than it feels.
There are two ways to get this wrong. Ask for a harmless one to be drained, and it usually fills straight back up, with a small new risk of infecting a sac that was never infected. Sit on an infected one for a week, and the infection can spread into the skin of the arm and end with a surgical washout instead of a course of pills.
The reassuring part first. Most of these are not serious, don’t need draining, and settle over a few weeks once you stop doing the thing that caused them.
The part that matters. A meaningful number of them are infected, and an infected one needs antibiotics today, not a wait-and-see.
Is my elbow bursitis infected? The four signs
Go through these honestly.
- Is it hot and red? Warmth you can feel by comparing with your other elbow, and redness over and around the swelling, points at infection.
- Does it really hurt? The non-infected version is often surprisingly comfortable, uncomfortable when you lean on it and otherwise ignorable. Genuine, constant, throbbing pain is a warning.
- Is there a break in the skin? A scratch, graze, insect bite, shaved skin or a cut anywhere over the elbow gives bacteria a way in. Most infected bursae have one.
- Are you unwell? Fever, chills, or redness spreading up or down the arm means go now, today.
One more useful check: can you still bend and straighten the elbow fully and fairly comfortably? Bursitis sits outside the joint, so the joint itself usually still moves. An elbow that is swollen and genuinely won’t move is a different problem, and a more urgent one. See cellulitis and septic arthritis.
Soft lump, elbow still bends, not hot: almost always the bursa. Hot, painful, and a scratch in the skin: assume infection until someone rules it out.
What is olecranon bursitis?
The olecranon is the bony point you lean on. Between that bone and the skin sits a thin, flat sac, the bursa, whose entire job is to let skin glide over bone without shredding.
Skin over the elbow tip is loosely attached and there’s almost nothing between it and the bone. So the bursa takes everything.
What causes a swollen bursa on the elbow?
It fills for three sorts of reasons.
- Repeated pressure and friction, which is the common one. Leaning on desks, drawing boards, car door frames, workbenches. It’s been called student’s elbow, plumber’s elbow and miner’s elbow, which tells you everything about who gets it. (Rodin’s Thinker, elbow parked on his knee for over a century, is a prime candidate.)
- A single hard knock, where the bursa bleeds and swells over hours. If the fall was hard and you can’t straighten the elbow against gravity, a fracture needs ruling out first. See olecranon fracture.
- An underlying condition: gout, which is a classic cause and tends to be far more painful, and rheumatoid arthritis.
How is olecranon bursitis diagnosed?
- Examination is usually enough: a soft, fluid lump right over the tip of the elbow, with the joint still moving.
- Aspiration (fluid drawn off with a needle) when infection or gout is suspected. The fluid is tested for bacteria and crystals.
- Blood tests if you’re unwell or gout is on the list.
- X-ray after a fall, to check for a fracture, or if a bony spur on the tip of the elbow keeps irritating the bursa.
- Ultrasound occasionally, to confirm fluid or look at a lump that isn’t behaving like a bursa.
How do you treat olecranon bursitis at home?
The treatment is unglamorous and it works, provided you actually do the first item.
- Stop leaning on it. Every single time you rest that elbow on a surface, a table or a wall, you refill the sac. This is the whole treatment, and it’s the one people skip because it’s free and boring. Please don’t.
- Pad it. An elbow pad or a folded towel where you habitually rest the arm, for the six weeks or so it takes to settle.
- Compression sleeve. Helps the sac collapse down rather than staying stretched.
- Ice in the first few days if it’s sore: 10 to 15 minutes, wrapped in a cloth, a few times a day.
- Keep moving the elbow normally. There’s nothing to protect inside the joint. If swelling makes it feel tight, full bend and full straighten, 10 slow reps, 2 to 3 times a day.
Anti-inflammatory pills can help with soreness if your doctor or pharmacist says they’re safe for you. They don’t replace the padding.
Should olecranon bursitis be drained?
Draining it with a needle is not the routine answer, and this surprises people who arrive wanting exactly that. Aspiration is used mainly to test the fluid when infection or gout is suspected. Drained for cosmetic reasons alone, it usually refills, and it introduces a small risk of infecting a bursa that wasn’t infected.
A steroid injection is sometimes offered for a stubborn, non-infected one. It can shrink it, but it carries its own risks of infection and thinning of the skin over the tip of the elbow. It’s a conversation with your doctor, not a first step.
If it is infected: antibiotics, aspiration to identify the organism, and close follow-up. If it isn’t clearly better within 48 hours of starting antibiotics, go back.
How long does olecranon bursitis take to go away?
Pressure removed and padding worn, this is the usual course for the non-infected kind.
- Days 0 to 3: the lump is at its biggest. Pad it, compress it, ice if sore, and run the four-sign check every day.
- Weeks 1 to 2: softer and smaller, provided you’ve really stopped leaning on it.
- Weeks 2 to 6: most settle in this window.
- Months 2 to 6: a thickened, painless, slightly rubbery lump often hangs around, and sometimes stays for good.
That leftover is scar tissue in the sac wall, not ongoing inflammation, and it doesn’t need treating.
In Closing Window terms, the ordinary kind runs on an OPEN window: time is on your side, as long as the pressure stays off. The infected kind is the one with a clock, and it’s measured in hours to days, not weeks.
Recurrence is the real issue, and it’s almost always the same cause returning. If it comes back twice, the answer isn’t a different treatment, it’s finding the surface you keep leaning on.
Can I work, drive and go to the gym with olecranon bursitis?
- Desk work: yes. Elbows off the desk edge, padded armrests, and set the chair so your forearms rest on the desk rather than your elbow tips.
- Manual work: yes, with an elbow pad if the job has you leaning on it or crawling into tight spaces.
- Driving: fine. Stop resting the elbow on the door frame or the armrest.
- Gym: swap forearm planks for straight-arm planks, and skip anything that grinds the elbow tip into a bench or mat. Lifting is usually fine if it’s pain-free.
- Contact sports and falls (wrestling, jiu-jitsu, volleyball, skating): an elbow pad until it settles.
- If it’s infected: no gym and no contact sport until your doctor clears it.
When does olecranon bursitis need surgery?
Surgery is reserved for the ones that don’t settle or keep coming back, and for infections that don’t respond to antibiotics and drainage. The operation removes the bursa (a bursectomy).
The skin over the elbow tip is thin and stretched every time you bend, so the wound can be slow to heal. Expect a few weeks with pressure kept off it, sometimes a splint, and the surgeon’s protocol on when to bend fully.
What else could the lump or pain be?
- Pain at the back of the elbow when you push, without a squashy lump: that’s more likely the tendon. See triceps tendonitis.
- Swelling inside the joint, and an elbow that won’t fully straighten or locks: see elbow osteoarthritis.
- Tingling in the ring and little fingers: leaning on the elbow also squashes the ulnar nerve, which runs just beside the point. See cubital tunnel syndrome.
- Firm, rubbery nodules along the back of the forearm, rather than one soft sac, are more typical of rheumatoid arthritis or gout.
Not sure which part of the elbow you’re dealing with? Elbow pain by location sorts it.
What a hand therapist does differently
- Finds the surface. Desk, car, couch armrest, workbench. Without that, the treatment is a waiting room.
- Sets up the pad and compression so they actually stay on through a working day.
- Checks the ulnar nerve while we’re there, cos the same habit squashes both.
- After a bursectomy, protects the wound early and gets full bend and straighten back without splitting the scar.
Get it checked today if
- The lump is hot, red, or genuinely painful.
- You have a fever, chills, or feel unwell.
- Redness is spreading up or down the arm.
- There’s a cut, graze or bite over it, or pus coming out of it.
- The elbow is swollen and you can’t bend or straighten it.
- You have diabetes or a weakened immune system and the elbow is red and swollen.
- You’re on antibiotics for it and it isn’t clearly better after 48 hours.
Get it checked if
- It hasn’t settled by 6 weeks with the pressure genuinely off.
- It keeps coming back.
- It came up after a hard fall onto the elbow.
- It’s very painful with no injury at all, which raises gout.
- You have tingling in the ring and little fingers as well.
If it’s the second or third time, the lump isn’t the problem. The habit is.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. A hot, red or painful elbow swelling, with or without fever, needs seeing the same day.
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.