Background: lumbar disc herniation (LDH) is one of the most frequent causes of low back pain as well as lower extremity radicular syndrome. Aim: to examine the impacts of High Intensity Laser Therapy (HILT) on the morphology of subacute lumbar disc herniation. Patients and Methods Sixty patients of both sexes with subacute lumbar disc herniation with back and leg pain, aged from 20 to 50 took-part in this study. patients were randomized into two equivalent groups. Group A control group: treated by medication only