What is the difference between "disease process", "signs and symptoms", and "pathophysiology of the disease"?

I am writing a paper on hyperthyroidism for my pathophysiology course, and the rubric seems really unclear to me. Maybe it's because this is an accelerated course and the first of its kind that I've taken, but I can't figure out exactly what the professor is looking for, and they haven't responded to my attempts at contact yet. The rubric wants a section where I "define the disease process", then a separate section where I discuss "signs and symptoms" as well as treatment options, and another section where I discuss the "pathophysiology of the disease". Wouldn't there be a lot of overlap between the information for each of those sections? What exactly does "define the disease process" mean anyway?