Mastitis vs Clogged Duct Checker

They sit on the same spectrum and can feel similar at the start, so the practical difference is how the rest of you feels. A plugged or clogged duct is localized: a tender lump or a firm, red, warm wedge in one part of one breast, while you feel otherwise well — no fever. Mastitis is that same red, warm, painful area plus systemic illness: a fever, chills, body aches, and a run-down, flu-like feeling. In short, a plugged duct is a local plumbing problem and mastitis is inflammation that's made you feel sick all over. The distinction matters because a plugged duct often settles within a day with continued milk removal, whereas mastitis with a fever that isn't improving in about 24 hours needs a clinician and may need antibiotics. This checker maps your answers to those patterns, but only a clinician can diagnose which one it is.

The single most important step is to keep milk moving: continue breastfeeding or pumping on the affected side as normal — don't skip feeds or stop nursing, because effective, regular milk removal is the core of treatment for both a plugged duct and mastitis. Add rest, plenty of fluids, and gentle care. Between feeds, a cold compress can ease swelling and pain, and it's fine to ask your clinician or pharmacist which over-the-counter pain reliever is right for you. The Academy of Breastfeeding Medicine's mastitis protocol specifically advises against deep or aggressive massage and against trying to forcefully 'empty' the breast with extra pumping — both can worsen inflammation. Think gentle support, feed on demand, rest — not force. If you're unsure your baby is draining the breast well, a lactation consultant (IBCLC) can help with latch and positioning.

See a clinician promptly if you have a fever that isn't improving within about 24 hours, if symptoms are getting worse rather than better despite keeping milk moving, or if a plugged duct simply isn't easing after a day or so — mastitis may need antibiotics, and that's a prescription decision. Treat it as urgent — contact your provider right away or go to urgent care — if you have a high fever with feeling very unwell (shaking chills or rigors), a soft, fluid-filled, very tender lump that's getting bigger (a possible abscess, which sometimes needs draining), redness that is spreading or streaking outward, or a cracked nipple that looks infected with worsening pain or pus. Reach the right person through your OB/GYN, midwife, or primary-care clinician; an IBCLC lactation consultant is a great addition for the feeding side. This tool can flag the pattern, but it can't examine you — when in doubt, call.

Yes — and you should, unless your clinician tells you otherwise. Continuing to breastfeed or express milk is not only safe with mastitis, it's the main treatment, because moving milk out relieves the stasis that drives the inflammation. Your milk is safe for your baby, and if you're prescribed antibiotics, most are compatible with breastfeeding (your clinician chooses one that is). Stopping abruptly tends to make things worse by letting milk back up. If feeding on the sore side is painful, it can help to start the baby on the less-affected side and then switch, or to hand-express a little for comfort — but keep the milk moving. If continuing feels impossible or the pain is severe, that's a reason to call your clinician or an IBCLC rather than to wean on the spot.

Engorgement is generalized, not localized. When your milk first comes in — or any time the breasts get overfull — both breasts can feel very full, hard, swollen, and tender all over, sometimes warm, usually without a fever. A plugged duct or mastitis, by contrast, is a specific red, warm, painful wedge in one area of one breast, and mastitis adds fever and feeling ill. The fixes overlap (keep milk moving, feed often, gentle comfort measures), but they're different problems: engorgement is too much milk sitting in the whole breast, while a plug is a localized blockage and mastitis is localized inflammation that's made you feel sick. If engorgement is severe, or a localized wedge and a fever develop on top of it, that points back toward mastitis and is worth a clinician's eyes.

Yes. This checker runs entirely in your browser: your answers are worked out on your own device and are never sent to a server, saved, or shared — close the tab and they're gone. There's no account, nothing is stored, and there's nothing to delete. What you get back is general educational information based on published guidance from the Academy of Breastfeeding Medicine, ACOG, the Office on Women's Health, and MedlinePlus; it isn't medical advice, a diagnosis, or a substitute for being examined by the clinician who can actually see your breast and check your temperature.