This is general information, not a diagnosis for your situation — if you're feeling unwell or unsure, call your GP, midwife, or 13 HEALTH (13 43 25 84).
Mastitis isn't automatically an infection
If you've had mastitis before, chances are you assumed it meant antibiotics, straight away. That's not quite right. Current evidence shows mastitis is primarily an inflammatory condition — it generally begins as inflammation, and inflammation on its own doesn't need antibiotics to settle.
It can progress to a bacterial infection. But "can" isn't "always," and knowing which stage you're likely in changes what's actually worth doing first.
Inflammatory vs bacterial — what's actually different
Inflammatory mastitis happens when milk isn't clearing well from one part of the breast — a missed feed, an oversupply, pressure from a bra strap, or a change in your baby's pattern at the breast. Milk backs up, the tissue swells, and that swelling is what causes the heat, redness, and ache. It can feel exactly like an infection, even when no bacteria are involved yet.
Bacterial mastitis is what that inflammation can turn into if the congestion isn't eased. Swelling slows milk flow further, and the stagnant, inflamed tissue becomes somewhere bacteria — already normally present on skin and in milk — can take hold and multiply.
Why it can progress, and why early action matters
This is the part more recent thinking has shifted on. Because inflammation usually comes first, focusing on effective milk transfer and reducing that inflammation early is thought to lower the chance of things progressing to a bacterial infection — and for some people, it settles without antibiotics. Whether that's the case for you is a decision for your GP, though, not something to aim for by holding off on care. The first day or so, while it's still inflammatory, is simply where early self-care tends to help most — and if things are getting worse rather than better, that's exactly when to check in with a GP.
What genuinely helps, early on
None of this replaces medical advice, but it's a sensible starting point while you keep an eye on how you're feeling.
- Keep feeding or expressing to your baby's normal pattern — not more, not less
- Focus on effective attachment and positioning rather than deep or firm massage
- Skip the extra "just in case" pump sessions — they can increase supply and prolong the swelling
- A cold compress between feeds tends to calm inflammation better than heat
- Rest, fluids, and appropriate pain relief on your GP or pharmacist's advice
This is also where Hayley's mastitis treatment visits fit in — supporting effective milk transfer and using LLLT and therapeutic ultrasound to help settle inflammation, alongside the steps above. It's supportive care, done alongside your GP, not instead of one. The same early window applies to a straightforward blocked duct, too — especially if it tends to flare up overnight.
When antibiotics are necessary — that's a decision for your GP
Some mastitis does become bacterial and needs antibiotics, and that's a normal, sensible outcome — not a sign you've done anything wrong. Only a GP can assess your symptoms and prescribe, but signs that often prompt that conversation include no improvement after about 24 hours of focused self-care, a fever that persists or climbs, visible pus or a lump that feels like it's forming an abscess, or feeling generally more unwell rather than better. If any of that sounds familiar, it's worth calling your GP the same day rather than waiting to see.
When to see a doctor
Trust how unwell you feel over any checklist. Call your GP, midwife, or lactation consultant, or 13 HEALTH (13 43 25 84) any time of day, if things aren't easing. See an after-hours GP or your nearest hospital emergency department if you're significantly unwell — a high fever, shaking chills, redness spreading quickly, or you simply feel very unwell. For the fuller picture, mastitis or a blocked duct? and mastitis: when to see a doctor go into more depth.
However it started, you don't have to work it out alone
Sore, swollen, and unsure whether it's "just" inflammation or something more — that's a genuinely hard place to make decisions from, especially with a newborn attached to you most hours of the day. You don't need to self-diagnose. You need someone to look, help you feed effectively, and tell you honestly whether today's the day to call your GP.
Meet Hayley, browse pricing, or book a visit to talk it through.