On 9/26/13 employee reported a lower back stain, he was checked out by a First Responder, who said he was ok, employee didn't want to be checked out at hospital and was released to return to work duties. Employee reported to hospital on 2/28/14 complaining of lower back pain (associated to 9/26/13 incident) he was checked out and prescribed medication and to RTW in 2 days (3/3/14)