Mammary constriction syndrome

Experiencing deep, intermittent pain in the breasts (could be one sided or both breasts) undiagnosed by other causes, and thought to be related to the muscles surrounding the breasts, as well as perhaps poor posture and position when breastfeeding.

MCS is defined as “A still hypothetical and newly described set of symptoms that address breast and nipple caused by the tightening of chest muscles leading to a lack of blood flow to the breast and nipples.  May be treated with Pectoral Muscle Massage.”

If you need breastfeeding help, please contact your local support group, La Leche League or Nursing Mothers Counsel. You can also email me at

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