Seroma – What Is It, and Why Does My Boob Feel Like a Pint Glass?
You've had surgery. Lumpectomy, mastectomy, maybe some lymph nodes taken out for good measure. And now there's a weird, wobbly bulge under your skin that definitely wasn't there before. Congratulations, you've brewed yourself a seroma.
What actually is it?
It's fluid. Just your body's way of saying "well, something happened here, better fill the gap." Think of it as your body pulling its own pint post-surgery — pouring fluid into any space left behind once the swelling goes down or the drain comes out.
It usually turns up about a week after surgery, right on cue like a mate who always shows up "fashionably late." But not a mate you're very keen on.
Does it hurt?
Not exactly painful, but it feels strange. A tight, sloshy, swollen-balloon kind of strange. Some people describe pressing on it a bit like pressing on a filled hot water bottle.
The glamorous bit: draining it
If your body doesn't reabsorb it on its own, your nurse will simply drain it with a syringe. And yes it looks exactly like a pint of Newcastle Brown Ale.
Don't worry though it's completely routine, and honestly, quite satisfying to watch, and not just for you. My nurse, mine was called Sue, would rub her hands together and say, "Oh, that's a juicy one."
When to actually worry
Most seromas are harmless, if annoying. But keep an eye out for the following, because these are the moments to skip the "just leave it, it'll settle" approach and get it checked:
- Redness, warmth, or tenderness – this can be a sign of infection, not just a normal seroma.
- Real discomfort or pressure on the wound – if it's straining against your stitches, get it looked at.
- Serious swelling that keeps building – this could be the start of lymphoedema, a different (and longer-term) fluid issue, rather than a straightforward seroma.
Remember
A seroma is messy, a bit uncomfortable, but rarely dangerous. Keep watching for the warning signs above, and if anything feels off, don't wait it out ring your breast care nurse. They've seen it all before.
The horrendous journey to the hospital and the cost of parking are just as annoying. But like all things, it will pass, so stay on the bus.
Andrea Moulding is a breast cancer survivor, author of Stay on the Bus: Navigating Breast Cancer and founder of the Stay on the Bus CIC. She writes and speaks about the honest, human side of a cancer diagnosis. Connect on LinkedIn, Instagram, or Facebook.