Lumbar Disc Herniation

A lumbar disc herniation is the most common cause of pain that travels down the leg, what most patients know as sciatica. Each disc between the vertebrae of the lower spine has a soft gelatinous center, the nucleus pulposus, encased in a tougher outer ring, the annulus fibrosus. When the outer ring tears or weakens, the inner core can push backward into the spinal canal and press against one of the nerve roots that exits at that level. The nerve root becomes irritated both by the mechanical pressure and by inflammatory chemicals released from the disc itself, producing pain that follows the nerve's path rather than staying in the back.

The levels most often affected are the lowest two in the spine (L4-L5 and L5-S1), where the pinched nerves are the ones that run down the leg to the foot. Symptoms are classically worse with sitting, bending, and anything that raises pressure in the abdomen (a sneeze, a cough, straining on the toilet), because those movements push the herniated material harder against the nerve. The large majority of lumbar disc herniations resolve with nonoperative care as the displaced fragment shrinks and inflammation subsides, surgery is the exception, not the rule.

The signature symptom is pain that travels from your lower back into one leg, often described as a burning or electric-shock sensation that follows a specific path down the leg, sometimes all the way to the foot. The leg pain is usually far worse than the back pain itself.

Sitting, bending forward, coughing, and sneezing tend to make the pain sharply worse because these positions push the disc material harder against the nerve. Numbness or tingling in the foot or toes, weakness when lifting the foot (foot drop) or rising on tiptoe, and relief when standing or walking are all common. Emergency: sudden loss of bladder or bowel control, saddle-area numbness, or bilateral leg weakness means a trip to the emergency department, not a clinic appointment.

Your provider will start with a focused physical exam of the back and legs to see whether a nerve is being pinched and which one. An MRI is the standard imaging test. An important nuance: many adults who have no symptoms at all also have herniations on MRI, so the imaging finding has to match your specific symptom pattern to be the actual cause.

The single most important thing to know: most lumbar disc herniations get better without surgery. As the displaced fragment shrinks and the inflammation around the nerve settles, the leg pain usually fades on its own. The plan below works with that natural healing, the steps are listed in the order we usually introduce them, each one added on top of the last rather than instead of it.

Most lumbar disc herniations resolve with a structured non-operative plan. Surgery becomes the right step for a small number of patients, typically those whose leg pain, weakness, or numbness has not improved after a genuine trial of care, or patients with red-flag findings such as progressive motor weakness or cauda equina syndrome (loss of bowel or bladder control), which is a medical emergency. When surgery is appropriate, it falls outside the care OSI provides, so we refer you to a spine surgeon. OSI does not perform or coordinate spine surgery; your non-operative care stays with us.

Emergency. Bilateral leg weakness, saddle numbness, or loss of bladder or bowel control is a surgical emergency, go to the nearest emergency department rather than waiting for a clinic appointment.

External patient-education references and related OSI pages for additional background:

• AAOS OrthoInfo, patient education library
• OSI glossary, orthopedic terminology in plain language