Lisa J writes about a mom with "onesided nipple compression".
I assume you have checked to be sure the nipple is centered in
baby's mouth right to left.  So often we concentrate on where the
nipple is aimed up vs down that it's easy to overlook whether it is
centered side to side.  Is her nipple located in the center of the
areola?  If there is more areola on one side that the other, mom may
be looking at getting the areola centered rather than the nipple.
Is the compression in the same location on the nipple regardless of
the baby's position (e.g. cradle vs football)?  Then I would suspect
some kind of variation in mom's nipple structure.  (If the
compression were in the same location relative to baby's mouth, then
look for some variation in baby's mouth structure or function.
However, since you mentioned it occurs both with nursing and
pumping, then there must be something about mom's nipple itself.)
If this is only happening on one side, I would first assure her that
it is very possible to nurse a baby from just one breast.  It
doesn't have to be a matter of both or nothing.  She may relax more
if she realizes that even if you are never able to find out why it's
happening and come up with a way to avoid it, she can still nurse
from the other side alone.
Winnie IBCLC

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