Women suffer more pain than men across the whole body, major global study finds
(www.theguardian.com)
Even so, this is a cultural question, not a healthcare one. While women are treated more poorly within the healthcare system, men are exposed, outside the healthcare system, to "man up", "suck it up", "boys don't cry" and a general attitude that admitting to pain is weakness and unmanly.
There may be an abundance of reporting; I would be willing to bet that male pain is better studied than female pain, because that usually seems to be the case (medical science ignoring female physiology to an almost comical degree). But, the point op was making is that the men in the studies are more likely to lie/downplay their pain because of the culture of toxic masculinity. It's one of the ways men are victims of the patriarchy too.