EE reported back pain on 2/4/10 due to repeatedly bending over while coiling up heat trace cable. He did not want to see dr at that time. On 2/9/10 he reported he had reinjured his back while lifting his personal tools from back of site truck. He still did not want to see a dr. On 2/10/10 he notified his supervisor he was not coming in due to back pain. He was then taken to a dr.