I generally look for the problem myself if it is something requiring medical help I will go. Generally I tell the doctor what I have, he checks me out and usually confirms my diagnosis and at this time I believe its called old age and being too hard on my body in my younger years...my prognosis may change
I'm an I.T. professional and people bring their computers to me all the time telling me what the problem is. I lie and confirm their prognosis to them in person because it's easier than explaining what the real issue is, and then I fix it and give it back.