Why is it that every time you go to the Doc w/ symptoms they tell you it’s normal & send you away!…

Why is it that every time you go to the Doc w/ symptoms they tell you it’s normal & send you away! BUT as SOON as something goes wrong or they find a problem the first question they ask you is “why didn’t you come sooner?” I’m so annoyed. Can you at least check? Everything is N O T normal.