Most likely it is a flare.

I do know that most hospitals are willing to work with you on payments if you ask them. For example, in the last year my 11 (so far) MRIs after my insurance have left me a little over $8,000 in debt to the hospital. And I am not working right now due to the problems I am having medically. They set up a plan and are willing to accept $20 a month which is my minimum. I usually send more than that, but the lady at the hospital explained to me that even at $20 a month it is still better than nothing and they would rather have small payments than none at all.