If you're overweight, do you sometimes feel like doctors blame everything on that?

I'm not overweight, just wondering. It seems like doctors chalk up any kind of pain or discomfort or abnormality to being overweight, like it's an easy out without doing any investigating. I know being overweight causes a lot of problems, but shouldn't the doctors look into it a little more before just saying oh lose weight and that will solve the problem. Like my mom was missing her period a lot, and the doctors just said she needed to lose weight. Turned out she had PCOS, but they didnt find that out for a while until one doctor decided to investigate more.