Injury or weakness can cause an inner portion of the disk to protrude through the outer ring. This causes pain and discomfort The most common location for a herniated disc to occur is in the disc at the level between the 4th and 5th lumbar vertebra in the low back. Symptoms & Science 1. Pain & numbness most commonly on one side of the body. 2. Pain that extends to your arms or legs 3. Pain that worsens at night 4. Pain that worsens after standing or sitting 5. Pain when walking short distances 6. Unexplained muscle weakness Diagnosis 1. Diagnosis begins with a complete history and physical examinations and then by X-rays and CT scans. 2. An MRI scan is the most accurate test however small prolapses may be missed. 3. Other investigations include CT Myelogran & a nerve sheath injection with a local anaesthetic. 4. Treatment. 80% of the disc prolapses settle by themselves and their symptoms almost disappear and typically this process takes 6-8 weeks but may take longer.