Endometriosis Support Group
Endometriosis is a common medical condition where the tissue lining the uterus is found outside of the uterus, typically affecting other organs in the pelvis. The condition can lead to serious health problems, primarily pain and infertility. A major symptom of endometriosis is pain, mostly in the lower abdomen, lower back, and pelvic area.
http://www.endo-resolved.com/support-files/endometriosis_survivors_letter.pdf
Anyway, this particular question used to bug the heck out of me too, and still does sometimes.... so you're certainly not alone on this one. WE know we're not feeling fine, and don't want to start complaining to others.... so when the question does pop up, I usually respond with the typical, "I'm hanging in there", or there is always," I'm better than I was, but not as good as I'd like to be", etc. Of course, it depends on who is asking the question. Is the person just an acquaintance or someone you know and trust. I hope tomorrow is a better day for you.... if only a little bit. Take good care of yourself.
((Hugs))