Your question is a good one, and I think it depends on a number of factors. My two cents as a nonpracticing woman (which is my tongue-in-cheek way of saying that my parents raised me as one but my beliefs have since changed):

People talk about the ways that doctors dismiss women's symptoms, but I've found that a lot of women dismiss or downplay their own symptoms, which further hurts their chances of getting diagnosis, let alone treatment. There may be a sort of feedback loop between dismissive doctors and self-dismissive patients. My own story in that department is that I wrote off a certain set of symptoms for years because they weren't serious compared to my "real", established problems, but an astute doctor pushed me to address them, and in the process we found out that they were caused by a much bigger underlying issue... specifically, an underlying issue that was also the reason my established problems weren't getting better. In that instance, skepticism would not have helped!

That said, and this might be controversial or uncharitable of me, but I think there can be a tendency for some women to fixate on their problems, which often makes them worse. (Does that contradict my "dismiss and downplay" observation? Maybe. Or it could just be that people fall into one camp or the other.) Sometimes it's garden variety hypochondria, and other times I think it's another type of feedback loop where you have problems that no one can identify and/or help you with, so you're suffering but not many people believe you, and your symptoms are unmanaged or only barely managed through a fragile collection of DIY measures. This puts you in a precarious position (understandably), which is obviously nerve-wracking, which in turn means you're either (1) hypervigilant to new developments in your condition, and so any change is a cause for alarm because you don't know what the implications will be, or (2) always worried that you'll deteriorate at a moment's notice, and the ensuing anxiety can cause your symptoms to worsen, so that anxiety becomes a self-fulfilling prophecy. (Ask me how I know, lol.)

There's also a saying I've heard along the lines of "you can't get better if you have to constantly prove you're sick," which I think applies to a lot of people who are struggling to get taken seriously by doctors: not only are you not getting proper treatment, but you're also in a position of having to prove the legitimacy of your issues, which means that any spontaneous and/or self-medicated improvement in symptoms might be a sign that the people who think it's all in your head are correct. (The implications here could be internal, in the sense that part of you worries they're right, or external, in the sense that you know they're wrong and can't let them think they're right.) After you figure your shit out and stop having to "perform" for people all the time, it's easier to allow yourself the space to get better—because now your problem didn't go away, exactly, it's just responding to treatment, or it's in remission, or so on. The validation of a proper diagnosis creates a kind of permanent road marker that lets you move on from it, but still point back to the road marker when you need to.

Another thing that's a slight tangent, but I think still relevant to gender disparities at play: sex hormones play a HUGE role in certain conditions. Most people won't realize the extent to which this is true unless they've undergone drastic differences in the types of sex hormones in their body over the years... but I have, so let me share my experience in that department :)

- High/unmodified estrogen: The worst. Things were always bad, but obviously much worse at certain times of the month.

- Using progesterone to lower estrogen levels: Significantly better, although still a fairly crummy baseline. Those times of the month were far less bad.

- Using testosterone to suppress/lower estrogen levels: SO much better, holy shit. It's hard to even describe. Not just the obvious things related to strength and muscle mass; there's an overall sense that certain things have generally calmed down. (Also, now no times of the month, which helps too :P)