In chapter one of Metamorphosis, I noticed the word "pain" came up numerous times, seemingly always referring to Gregor. He felt physical pain when he fell off the bed, when he opened the door, and when was shoved by his father back into his room at the end of the chapter (which left him "bleeding profusely," a strange part I thought). It seems as though Gregor is not new to pain, as he meditated on the "torture of traveling" at the beginning of the chapter. This pain for Gregor--not just physical, he will likely deal with emotional pain as well--may not go away. It seems as though it will continue throughout the book, possibly changing as Gregor changes and deals with his isolation.