When healthy people journal, they get either one of those plain journals or those really fancy journals, like from Barnes and Nobles, or you can get one of those creative Barlona Moina journals.

Like these types of journals.

Meanwhile, a person with a chronic illness may buy that, or buy a health journal log to write down all their symptoms.

Today, I went to a store in Sarasota and found a journal called Health-A Medical Journal.
There, you can write down your vitals, your symptoms, concerns, doctors, medicine, etc.

I've been persuaded by my parents to write down my symptoms, so I got this journal.