I have read things where it was stated as fact that the more symptoms you have the more likely you are to have a psychiatric or possibly psychological illness.
The problem with that is it may work for something easy to diagnose or with a test. If it is suspected that you have an overactive thyroid you get a blood test done and it is yes or no, so you do not have to list overheating, itches, tremors, weight loss, increased appetite, ketones on the breath, palpitations, fatigue, yellow eyeballs; all of which my husband experienced.
When you are not getting a diagnosis you keep going back to the doctor with something else you've noticed because it might be the thing that makes the doctor go "OK, got it now".
So the long list of symptoms is just as likely to be an artefact of a lack in current medical practice rahter than saying anything about the patient's illness.