Let’s start this with a question.
Which scenario would you prefer?
Something is wrong with you, you’re not sure what it is, you just know you feel like crap.
So you head to the doctor.
You get to the doctor and the doctor “assesses” you.
Asks you what is wrong and where you hurt. Then the doctor, from their experience, checks different areas that could be making you feel like crap.
Then following their assessment, they make an educated decision of how to treat you, and make you better.