Look into mammary constriction syndrome.  Edith Kernerman who works with 
Dr. Jack Newman in Toronto is studying this phenomenon.  It has to do 
with muscle spasms of the pectoral muscles.  I can be due to poor 
posture when breastfeeding/pumping and/or pre-existing muscle issues.  
She has a series of stretching exercises to alleviate symptoms.

-- 
Tania Archbold B.Sc., IBCLC
Mother's Nectar Lactation Consultant Services
519-400-7098
www.mothersnectar.ca

On 2014-03-26 17:48, Jessica Lang Kosa wrote:
> PTP. Mom is almost exclusively pumping. Good yield. About 10-20 min
> after pumping, she has several minutes of pain severe enough that she
> doesn't feel like talking, and would take pain medication if it
> continued. It goes away after a few minutes. Warm compresses haven't
> helped. Pump flanges fit fine, no sign of abrasion.  No pain while
> pumping, or at other times.  It sounds like the refill twinge that
> some moms describe, but I've never heard of it being this painful for
> weeks. This has been consistent for several weeks. Thoughts?
> 

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