Met a young man yesterday paralyzed below the waist who was visited in the hospital by an insurance representative who then had a lawyer draft some "documents to take care of medical bills." The young man lost his legal rights partly due to the ambulance chasing insurance adjuster and partly out of ignorance. To this day, the young man is not able to describe the documents he signed.
It is always in the interest of an accident victim to consult a lawyer and make certain he understands his legal rights. At the same time, the motives of anyone who asks that you sign something in the midst of a crisis is suspect. You get one chance to play the card hand of life and want to do it well. See http://www.junelawyer.com/.