Clogged duct or mastitis? How to tell the difference

How do the options compare?

The lens is a clinician's: guideline endorsement, pregnancy evidence, dosing, onset, and tolerability. Cost and formulation notes appear where relevant.

• A clogged duct causes a firm, tender lump with redness limited to that one spot, while mastitis adds a fever and a mother feeling generally unwell on top of the breast swelling and redness. 1
• Clinically, mastitis means breast pain and redness plus a temperature of 100.4°F (38°C) or higher, along with chills, body aches, and a faster heart rate. 2
• A plugged duct is considered a risk factor for mastitis, and clearing it within about 48 hours through frequent, effective milk removal is the standard advice for keeping it from advancing. 3
• About 5% to 11% of women with mastitis go on to develop a breast abscess, most often linked to milk stasis and a break in the nipple skin that lets bacteria in. 4
• For both a clogged duct and mastitis, frequent nursing or pumping, warm compresses before feeds, and gentle massage toward the nipple come first, with antibiotics considered for mastitis only if there's no improvement after about 24 hours of better milk removal. 1

Which option makes sense?

The comparison above is intentionally evidence-first, not brand-first. Please consult your healthcare provider to translate it into a plan that fits your pregnancy specifics.

Disclosure: Pregnancy Smart makes pregnancy supplements, though not in this category. This comparison is a plain description of the pregnancy evidence, not a sales page.