This is the 738th most frequent Chinese word.
身上
"On the body" or "with someone."
In this sentence, "身上" is used to indicate something that the person is carrying or has on their person.
他身上带了一本书。
He has a book with him.
Here, "身上" refers to the physical sensation or state of the body due to external conditions.
衣服湿了，我身上感觉很不舒服。
My clothes are wet, and I feel very uncomfortable.
In this context, "身上" is used to describe a reaction that occurs on one's body due to an emotional or physical stimuli.