Slip disc (lumbar disc prolapse)
The soft centre of a disc bulges or pushes through its outer ring and presses on a nerve root, causing back pain with pain, tingling or numbness down the leg. Most prolapses shrink over weeks to months. Treatment: medication, targeted physiotherapy, and a transforaminal epidural steroid injection under X-ray guidance when leg pain is severe or not settling. Surgery (microdiscectomy) is the right answer for progressive weakness, bladder or bowel symptoms, or pain that does not respond.