Back pain is the leading cause of disability worldwide. Most people will experience it at some point in their lives — and most will wonder the same thing: Is this serious? Do I need an MRI? Will I need surgery? This guide answers those questions honestly, using current clinical guidelines from the AAOS and NASS.
What’s Actually Causing Your Back Pain?
Back pain is a symptom, not a diagnosis. The treatment depends entirely on the cause — and the cause matters more than where it hurts. A herniated disc and a pulled muscle can both produce severe low back pain, but they follow completely different treatment paths. The most common causes, roughly in order of frequency:
- Muscle or ligament strain — the most common cause of acute back pain, especially after lifting, twisting, or sudden movement. Usually resolves in 4–6 weeks with conservative care.
- Herniated (slipped) disc — when the soft inner material of a disc pushes through the outer ring and presses on a nearby nerve. Most common at L4–L5 and L5–S1 in the lumbar spine.
- Lumbar spinal stenosis — narrowing of the spinal canal from arthritis and bone spurs. Produces leg cramping and weakness that worsens with walking and improves when you sit down or lean forward.
- Degenerative disc disease — age-related disc breakdown that is extremely common on MRI after 40, but is not the cause of pain in most people who have it on imaging.
- Spondylolisthesis — forward slippage of one vertebra over another, causing instability, back pain, and often significant leg symptoms.
- Compression fracture — usually from osteoporosis or trauma. Sudden, severe onset pain that does not improve with position change.
When Back Pain Is an Emergency
⚠ Important Go to an emergency room immediately if back pain is accompanied by: loss of bladder or bowel control (possible cauda equina syndrome — a surgical emergency that can cause permanent paralysis), progressive leg weakness in one or both legs, numbness in the groin or inner thighs (saddle area), symptoms following a significant fall or accident, fever or unexplained weight loss, or pain that is unrelenting in every position. |
Herniated Disc vs. Sciatica vs. Spinal Stenosis
| Herniated Disc | Sciatica | Spinal Stenosis | |
| Typical age | 30–50 | 30–75 | 50+ |
| Pain pattern | One-sided leg pain, sharp or electric | Buttock to foot, shooting | Bilateral leg cramping with walking |
| Gets worse with | Sitting, bending, coughing | Sitting, standing still | Walking, arching backward |
| Gets better with | Lying flat, gentle walks | Changing position | Sitting, leaning forward |
| Best imaging | MRI lumbar spine | Clinical exam or MRI | MRI + standing X-rays |
| Needs surgery? | 10–20% of cases | 10–20% of cases | Depends on severity |
Do You Actually Need an MRI Right Away?
Probably not, if this is a new episode without neurological symptoms. NASS guidelines recommend against routine early MRI for acute low back pain without red flags. A large percentage of adults over 40 have disc bulges, degenerative changes, or mild stenosis on MRI even without any back pain at all. Ordering imaging too early frequently produces findings that look alarming but aren’t causing your pain. MRI becomes appropriate when neurological symptoms are present (numbness, weakness, reflex changes), when red flags exist, or when 4–6 weeks of proper conservative care hasn’t produced improvement.
The Imaging Paradox
Finding a bulging disc or mild stenosis on MRI does not automatically mean that’s the cause of your pain. Dr. Grewal correlates imaging findings with your actual symptoms and physical examination before recommending any treatment.
What Treatment Actually Looks Like
AAOS and NASS guidelines agree: most patients — including those with confirmed disc herniations on MRI — should start with structured conservative care. Surgery is rarely the right first answer.
Physical Therapy
A properly directed PT program has stronger evidence than almost anything else for lumbar disc-related pain. McKenzie extension exercises, core stabilization, and neural mobilization address the underlying mechanics — not just the symptoms. Go Rehab Physical Therapy, affiliated with Grewal Spine, specializes in spine rehabilitation at all four of our locations.
Epidural Steroid Injections
When nerve root inflammation is severe, fluoroscopically-guided epidural steroid injections can reduce it directly — providing meaningful relief that allows patients to engage effectively in physical therapy. Fifty to seventy percent of appropriately selected patients experience significant short-term improvement.
When Surgery Becomes the Right Answer
The landmark SPORT trial (Spine Patient Outcomes Research Trial), published in JAMA in 2006 and followed through 8 years, is the largest study ever comparing surgery versus non-operative treatment for lumbar disc herniation — enrolling 501 patients across 13 multidisciplinary spine clinics in 11 US states. At 3 months, patients who chose surgery showed significantly greater improvement in bodily pain (40.9 vs 26.0 on SF-36), physical function (40.7 vs 25.3), and Oswestry Disability Index (-36.1 vs -20.9). These benefits were durable through 8 years of follow-up. The message: surgery works well for properly selected candidates — but the majority of patients improve meaningfully with non-surgical care alone, and that should always come first.
Surgery is considered when conservative care has genuinely failed after 6–12 weeks, when neurological deficits are progressing, or when a specific structural problem cannot be addressed non-surgically. Cauda equina syndrome is a surgical emergency — but that’s the exception, not the rule. Dr. Grewal’s approach is to exhaust non-surgical options first and recommend surgery only when it offers a clear advantage.
About Dr. Kanwarpaul Grewal, DO
Dr. Kanwarpaul Grewal completed his Complex Spine and Deformity Fellowship at the University of California, San Francisco after his Orthopedic Surgery Residency at Hofstra/Northwell Health System. He serves as Faculty for the Northwell Plainview Orthopedic Residency Program, Clinical Assistant Professor at NYIT College of Osteopathic Medicine, and was named 2020 Outstanding Teacher Award recipient and 2020 Attending of the Year by Northwell Health.
★★★★★ Sybille Nagorski-Drew
“Dr Grewal changed my life. I went from a 37-year-old living in daily pain to feeling like I have my life back. I would give him 100 stars if it would allow.”
Sources & Clinical References
- Ferreira ML, et al. ‘Global, regional, and national burden of low back pain, 1990–2020, its attributable risk factors, and projections to 2050: a systematic analysis of the Global Burden of Disease Study 2021.’ Lancet Rheumatology. 2023;5(6):e316–e329. [619M cases; 843M projected; 15.9M DALYs; #1 cause of YLD]
- Mancusi RL, et al. ‘Comparative Review of the Socioeconomic Burden of Lower Back Pain in the United States and Globally.’ Neurospine. 2024. [~$40B US cost; ~$2,000/patient/yr]
- AAOS OrthoInfo. ‘Low Back Pain.’ orthoinfo.aaos.org. 2025.
- NASS. ‘Diagnosis and Treatment of Low Back Pain.’ Clinical Guidelines. spine.org.
- Weinstein JN, et al. ‘Surgical vs nonoperative treatment for lumbar disk herniation: the Spine Patient Outcomes Research Trial (SPORT): a randomized trial.’ JAMA. 2006;296(20):2441–2450.
- StatPearls, NIH. ‘Low Back Pain: Evaluation and Management.’ ncbi.nlm.nih.gov/books/NBK538173/
