Lumbar disc herniation (LDH) is a major cause of low back pain traditionally associated with age-related degenerative changes of intervertebral discs in adults aged 30-50 years. Symptoms of LDH can include pain, sensory disturbances, or motor deficits depending on the degree of nerve root compression. This case report highlights a 21-year-old male college student with LDH and nerve root compression, complicated by a prior anterior cruciate ligament (ACL) injury and a sedentary lifestyle. Magnetic resonance imaging (MRI) findings revealed a left L4 nerve root compression and a central-to-right paracentral herniation affecting the right S1 nerve root. The assessment demonstrated significant pain and reduced range of motion (ROM) in hip flexion and extension. Physical therapy utilizing a multimodal approach emphasizing spinal stabilization, postural correction, and mobility exercises was implemented to enhance the patient's function and recovery process. Over the course of treatment, notable improvements in ROM and pain levels were observed. Treatment successfully culminated in minimal pain by the patient's final session. After physical therapy had concluded, and our patient resumed regular activities, he was able to achieve complete pain remission in approximately three months with ROM also returning to baseline. This case report underscores the multifactorial contributors to LDH in young adults, emphasizing the importance of a comprehensive approach to rehabilitation in managing spinal injuries for optimal outcomes.