Back Pain & Lumbar Disc Herniation

A lumbar disc herniation happens when one of the cushioning discs in your lower back bulges out and presses on a nearby nerve. It is one of the most common causes of low back pain and leg pain, and the great majority of patients recover with non-surgical treatment.

What’s happening in your back

Your lower back is built from five large vertebrae stacked on top of each other, with a tough but flexible disc between each pair. Each disc has a fibrous outer ring called the annulus and a soft, jelly-like center called the nucleus. With wear, injury, or sudden lifting, the outer ring can tear and let the inner gel push outward. When this bulge contacts a nerve root traveling to your leg, it can cause back pain, leg pain, or both.

Common symptoms

• Low back pain — sometimes dull, sometimes sharp
• Sharp, electric, or burning pain that radiates into the buttock, thigh, or leg (commonly called sciatica)
• Numbness or “pins and needles” in a specific part of the leg or foot
• Weakness in the leg, foot drop, or trouble standing on tiptoe or heels
• Pain that worsens with sitting, coughing, sneezing, or bending forward

Causes & risk factors

Most lumbar disc herniations are the result of gradual disc wear combined with a triggering event — bending and lifting, a twist, or a fall. Risk factors include being between ages 30 and 50, jobs that involve repetitive lifting or prolonged sitting, smoking, obesity, and a family history of disc problems. Genetics play a meaningful role in how quickly discs degenerate.

How it’s diagnosed

Diagnosis begins with your story and a physical exam that tests strength, reflexes, sensation, and how raising the leg affects your pain. MRI is the most useful imaging test for confirming a herniation and seeing which nerve is affected. X-rays may be used to look at bone alignment, and CT can be helpful if MRI isn’t possible.

Treatment options

Non-surgical care is the first step for most patients. Roughly 80–90% of lumbar disc herniations improve without surgery, often within 6–12 weeks. Treatment typically includes:

• A brief period of relative rest, then a return to gentle walking and daily activity
• Physical therapy focused on core strengthening, posture, and movement habits
• Over-the-counter anti-inflammatory medication; short courses of stronger pain medication or muscle relaxers when needed
• Epidural steroid injections for severe radiating leg pain that hasn’t responded to other measures
• Heat, ice, and education on safe lifting and sitting

Surgery is considered when leg pain remains severe after 6–12 weeks of structured non-surgical care, when imaging clearly matches your symptoms, or when there is significant or progressive weakness. A microdiscectomy is the most common procedure — through a small incision, the herniated piece of disc is removed to free the compressed nerve. Recovery is typically rapid, with many patients returning to most activities within a few weeks.

When to see a specialist

Seek evaluation if back or leg pain has not improved after 4–6 weeks, if leg pain is severe, or if you notice weakness or numbness that is getting worse. Seek emergency care for loss of bowel or bladder control, numbness around the groin or inner thighs, or sudden severe weakness — these can be signs of a rare but serious condition called cauda equina syndrome.