It is a direct result of structural racism, as it’s a product of the treatment of white men as being the default. You see it all the time in medicine. There are conditions that disproportionately affect black people that we don’t know enough about because time and money hasn’t been spent studying it.

Women face the same problem. Lots of conditions apply differently in women. An example of this being why women historically have been underrepresented in e.g. autism diagnoses. It presents differently so for a while the assumption was made that women just can’t be autistic.

I don’t think necessarily that people who perpetuate this problem are doing so out of malice, they probably don’t think of women/black people as lesser (hell, many probably are women and/or black), but it doesn’t change the fact that structural problems requires awareness and conscious effort to correct.