What are the usual causes of blocked ducts?

Engorgement or inadequate milk removal (due to latching problems, ineffective suck, tongue-tie or other anatomical variations, nipple pain, sleepy or distracted baby, oversupply, hurried feedings, limiting baby’s time at the breast, nipple shield use, twins or higher order multiples, blocked nipple pore, etc.). frequent/skipped feedings (due to nipple pain, teething, pacifier overuse, busy mom, return to work, baby suddenly sleeping longer, scheduling, supplementing, abrupt weaning, etc.). Pressure on the duct (from fingers, tight bra or clothing, prone sleeping, diaper bag, etc.). Inflammation (from injury, bacterial/yeast infection, or allergy). Others like stress, fatigue, anemia, weakened immunity.