Louie,
This is newer info than what I have, however, the (brief) article does say that evidence SUGGESTS that women are at higher risk during menses nad that Birth Control Pills MAY be a predisposing factor. However, the article also says that there is no clear causal relationship, this information is based on statistical evidence from the medical histories taken relative to DCI incidents. In Navy and Air Force studies results have been drastically different with regard to the question of women's susceptibility to DCI. Basically, the jury is still out on the whole subject, but no relevant studies have proven that use of Birth Control pills increases a woman's risk of DCI.