Clogged, blocked, and plugged ducts. There are many terms for the same problem. Restricted milk flow, or “milk stasis”
, leading from the milk-storing alveoli (those grape-like clusters in the breasts), may lead to a fatty blockage that soon becomes painful, and even infectious mastitis, if not treated quickly enough. These clogs can very well lead to other problems and occurrences, including lower supply thresholds, nerve pain in the breast tissue, lessened pumping output and bruising sensations.