Injuries sustained while working on the job should always be reported and documented. Too often people work through the pain out of fear of losing their job. OSHA enacted the OSH act of 1970. To ensure worker's safety and rights. Don't compromise yours. Familiarize yourself with the OSH act of 1970, below.
www.osha.gov/pls/oshaweb/owasrch.search_form?p_doc_type=OSHACT&p_toc_level=0
Legal reference.