My psychiatrist told me women with bipolar often have premenstrual issues and postpartum depression so seems like the moods can be made worse with hormonal changes. I could see it kind of going either way: hormone changes are causing mood swings, or hormone changes are exacerbating/triggering bipolar. I have heard sometimes people with PMDD are misdiagnosed as having bipolar, and some people with bipolar think they just have PMDD at first. Perhaps if strictly treating hormonal imbalances fixes the problem, like if someone had a thyroid issue that was treated and their symptoms improved, then it is primarily an endocrine issue, but if it is just one of many triggers then more likely to be bipolar. I think the interaction is between hormones and moods is very complex, though. More so maybe then we even understand yet. Hope the re-evaluation is helpful to you!