Over-exertion in lifting objects
Assisted coworker lifting hoses 8/30. Noticed L side pain next morning. Went to ER 9/1. Diagnosed w/abdominal wall strain. No treatment. Continued to work until 9/12 when off for unrelated elective surgery. Contact foreman 9/27 that ee had surgery 9/26 for hematoma thought to be caused by strain.