EE and a co-worker came to my office to report an injury that happened. EE stated that EE woke up this morning with back hurting, take ibuprofen 3x/day as needed. Apply ice pack 2-3x/day as instructed. EE stated EE was shoveling limestone dust off the top of Silo #4 for 1.5 to 2 hours, when EE felt a sharp pain in EE's mid back. EE said it was hard to breathe because of the pain.