Disc Bulge

A disc bulge sounds alarming, and it’s one of the most common things people are told after a back scan. The reassuring news is that disc bulges are extremely common, they frequently don’t cause any pain, and even painful disc-related problems usually settle without surgery. Understanding what’s actually going on, and what predicts recovery, is a big part of getting better.

Understanding disc bulges and herniations

The discs sit between the bones of your spine and act as shock absorbers. They have a tough outer layer and a softer centre. When some of the inner material pushes outward, it’s called a bulge, protrusion or herniation, depending on how far it has moved. If it presses on or irritates a nearby nerve, it can cause pain, pins and needles or weakness down the leg. This is often what people mean by sciatica, which we cover on our sciatica page.

Bulges are also a normal part of an ageing spine. Roughly a third of pain-free people in their twenties already show a disc bulge on MRI, and by their sixties most pain-free adults do. That’s why a bulge on a scan doesn’t, on its own, explain your pain. See our article on what your back scan doesn’t tell you for more.

Symptoms we commonly see

• Lower back pain, sometimes sudden after bending or lifting, sometimes gradual
• Pain that spreads into the buttock or leg, sometimes below the knee
• Pins and needles, numbness or burning in the leg or foot
• Pain that’s worse with sitting, bending forward, coughing or sneezing
• Stiffness and muscle spasm, and difficulty getting comfortable
• In some people, leg weakness

Our evidence-based approach

Current guidelines for recent-onset back pain and nerve-related leg pain favour education, staying active and exercise-based care, with imaging reserved for when it will change management. Our approach includes:

1. Assessment of your back, hips and nerves, including strength, reflexes and sensation, to understand how involved the nerve is and to screen for warning signs
2. Clear education about your scan and your outlook, so you can move with confidence rather than fear
3. Positions and activity advice that reduce irritation in the early stage while keeping you moving
4. Hands-on treatment and dry needling where they ease pain and help you move more comfortably
5. Graded movement and nerve-specific exercises to restore comfortable movement
6. Progressive strengthening of the trunk, hips and legs as you improve, so your back copes better with load
7. A graded return to work, training and sport, with supervised strength work in our private gym
8. Referral for imaging or specialist review when your symptoms, signs or progress call for it

What to expect: recovery timeline

• First few weeks: pain often settles substantially, with most of the early gains from staying active and managing irritation
• Six to twelve weeks: many people return to most activities, with strength and capacity continuing to build
• Persistent symptoms: may take longer, and we’ll involve your GP or a specialist if you aren’t progressing as expected

When to seek help urgently

Go to an emergency department straight away if you have new loss of bladder or bowel control, numbness around the groin or inner thighs, or progressively worsening weakness in both legs. These can indicate cauda equina syndrome, which needs urgent medical care. Also seek prompt assessment for a foot that’s dragging or weakening, back pain after a significant fall, or back pain with fever or feeling unwell.

References

• Chiu CC, et al. The probability of spontaneous regression of lumbar herniated disc: a systematic review. Clin Rehabil. 2015;29(2):184-195.
• Brinjikji W, Luetmer PH, Comstock B, et al. Systematic literature review of imaging features of spinal degeneration in asymptomatic populations. AJNR Am J Neuroradiol. 2015;36(4):811-816.
• Stochkendahl MJ, et al. National clinical guidelines for non-surgical treatment of patients with recent onset low back pain or lumbar radiculopathy. Eur Spine J. 2018;27(1):60-75.
• Qaseem A, Wilt TJ, McLean RM, Forciea MA. Noninvasive treatments for acute, subacute, and chronic low back pain: a clinical practice guideline from the American College of Physicians. Ann Intern Med. 2017;166(7):514-530.