I had carrot-red hair as a kid. Now it is red-tinted.

Back in 1995, there was a study to determine whether infertile red-headed women have an increased predisposition towards endometriosis.

They studied 143 women having laparoscopy and laparotomy for infertility. Of the 143 women who had the surgery, 12 had natural red hair, and 10 of those 12 women were found to have endometriosis. Thats 83% of the redheaded population in that study.

In contrast, only 55 out of 131 non redheaded women (42%) were found to have endometriosis. So, in that study in 1995, it was concluded that The results suggest an association between the occurrence of natural red hair and those factors that lead to the development of endometriosis.

One year later, another study came out, to reopen that case and study it again. In this much larger study, 90,065 women, who had never been diagnosed with endometriosis, infertility, or cancer made up the baseline and were followed for the next ten years.

The study was published in 2006, showing that in those ten years, 1,130 cases of laparoscopically confirmed endometriosis were reported among women with no past infertility.

According to endometriosis.org, who reported on the study:

Red hair colour was not tied to endometriosis in the overall analysis, which accounted for a variety of factors, such as parity (the number of times a woman has given birth) and body mass index. However, there was a suggestion that red hair colour slightly increased the risk of endometriosis among women who had never been infertile, but decreased the risk among those who were infertile.

Further investigation into the potential linkage between red hair colour and coagulation or immune dysfunction may explain the observed difference in the association between hair colour and endometriosis with concurrent infertility vs. endometriosis without infertility, the authors conclude.

http://www.livingwithendometriosis.org/2009/03/28/fact-or-myth-if-you-are-a-redhead-you-are-more-likely-to-have-endometriosis/

interesting, my book must be old! I didnt know they researched it further, what about a cure?!

I have red hair- and am struggling with IF, probably due to endo- whereas my brunette mother was always able to conceive whenever she wanted to.

My mother and sister both have red hair, bright red. I got my Dad's brown hair gene (although I do have some tents of red). Neither my mother nor sister have endometriosis. Although my sister has had 3 miscarriages. But endo runs on my moms side, so maybe she still passed the gene to me.

Count me in.
Here's another redhead connection....redheads are more sensitive to pain (not a good combination with endo). Elsewhere I've read that redheads are more prone to allergies (also not a good combination with endo)..
http://www.freerepublic.com/focus/news/769078/posts

that is so funny to hear I have never heard that, but it has to be true I have endo and have a huge family history of it and there all red heads.