Agreed; this is not a gender thing at all.

I suffer quite continual pain in my back, and have a bad habit of working through an illness to the point of exhaustion. I know plenty of friends who do the same, rarely complaining.

A girl and her brother that I know are constantly ill - and moaning about the smallest thing.

So it is a personality issue, I suspect, nothing to do with gender.

Every rule can have exceptions. I do not know if there is any data to back this up, though. Unless you consider that it seems women seem to visit doctors or medical institutions more much often than men (at least in the countries I know of). That could be an indication of this underlying behavior.

Or it could be that women are more often targets of violence and are more prone to medical issues due to reproduction.