Well, cannot scale pain, as I am used to pain. But, I'd guess around 6-7. After I drink juice, it starts after about 10-15 minutes, burning sensation right side almost all the way to the shoulder. It burns a little, and after 15-20 minutes it's gone. Happened before, there was a post some time ago, totally random. This time, I flushed liver this past friday (big flush), and mostly drink apple juice before and after the flush. Maybe acid from the apples?