Upper arm pain refers to the pain that is experienced between the shoulders and the elbows, either in one arm or in both the arms. There are a number of arm pain causes, varying greatly in the kind of effect they can have on the body.
Novel: anything over 40,000 words. However, 40,000 words is actually pretty short for a novel. Generally, 50,000 would be considered the minimum word count, and ideally a novel should be over 70,000 words. On the upper end, a novel over 110,000 words is considered an epic. That's the level where publishers may suggest dividing a story into multiple volumes.
I believe that the average words per page for a paperback book is 350 words. So, to figure out how many pages your manuscript would be as a paperback book, you would have to divide the word count of your novel by 350. Here is an example.