Which test to run please. I am inclined towards Wilcoxon signed Rank?

A researcher was interested in testing the effectiveness of a new pain relief medication in reducing back pain. She recruited participants with chronic back pain from a local medical practice and asked them to rate the severity of their back pain on an ordinal scale from 1 (mild pain) to 10 (severe pain). The participants were then instructed to take a course of the pain relief medication and return one month later. At one month, the researcher again asked participants to rate the severity of their back pain