Medical experience helps, but it’s not required up front. In the course, I have students read medical, heavy legal (hearings), all kinds of stuff. Any legal or medical term you don’t know, you can look up. iAnnotate has a nifty feature that allows you to Google by just highlighting any term you’re unfamiliar with so you can check its meaning and spelling. The key is knowing it could be misspelled and having the sense to stop real quick and check. Usually it’s pretty obvious it might be misspelled, because I’m familiar with Latin roots and other parts of words. I read them slowly to make sure they make sense — words like discectomy, symptomatology … the list goes on! Sooner or later they will become familiar to you, too.
I didn’t have any experience when I first started. Google and the dictionary (built in on iAnnotate) are my best friends 😉