By H. Rand Scott, MD — Medical Director, Newport Pain Management · Reviewed and updated July 2026
Low Back Pain and Sciatica: The Complete Guide
Back pain is one of humanity's oldest complaints — first described in the Edwin Smith papyrus around 1700 BC — and still its most common. Roughly half of working-age adults have back pain in any given year; it remains the leading cause of disability under age 45, and Americans spend well over $100 billion a year on it. If you're reading this because your back hurts, you're not alone.
First, the reassurance — and the warning
The good news: about 90% of severe back pain episodes resolve within two months. The frustrating news: most of those people will have it return within a year — which is why the prevention and exercise sections below matter as much as the treatment sections.
Emergency warning
Seek emergency care immediately for back pain accompanied by inability to urinate, loss of bowel or bladder control, or numbness in the saddle area around the groin and anus. These are signs of serious compression of the spinal nerves (cauda equina syndrome) and are a surgical emergency — hours matter.
Decoding your diagnosis: what "L4/5" means
Doctors number each spinal bone (vertebra). The low back is the lumbar region: L1 through L5, with L5 sitting atop the first sacral vertebra, S1. Discs live between vertebrae, so they're named by their neighbors — the "L4/5 disc" sits between the fourth and fifth lumbar vertebrae, roughly at the line across the top of your hips; L5/S1 is in the small of your back. Those two lowest levels bear the most weight and allow the most rotation, which is why they cause the most trouble.
Sciatica is a description, not a diagnosis: pain running down the back or side of the leg along the territory of the sciatic nerve, a large nerve formed from branches of the L4, L5, and S1 nerve roots that travels from the back all the way to the foot. Several very different problems produce it — and telling them apart is the whole game.
The critical MRI fact most patients never hear
Studies consistently show that 20–50% of people with no pain at all have disc bulges, protrusions, and degeneration on MRI. A herniated disc on your scan does not automatically mean the disc is causing your pain. This is the single most important idea on this page, because treating the scan instead of the patient is how people end up with failed treatments and even failed surgeries. Diagnosis comes from the history and physical examination — the scan confirms or refines it.
Disc-related pain
The disc is a rubbery shock absorber: a thick gel center wrapped in layers of tough fiber, like an onion with a jelly middle. Discs can dry out, build uneven pressure, or tear their outer layers and bulge or leak. Disc pain is typically sharp and shooting, worse with movement, coughing, sneezing, or straining. When a bulging disc pinches a nerve root, pain, numbness, or weakness appears in that nerve's specific territory in the leg — and because each nerve's map is well known, a careful exam of strength, sensation, and reflexes, sometimes supplemented by imaging and nerve tests (EMG/NCS), can determine whether the disc on your MRI is truly the culprit.
The causes doctors miss: non-disc back pain
Much back pain is treated generically, and when the patient doesn't improve, the second opinions and costs mount. Often the problem is one of these non-disc causes — several of which can be treated on the spot. Their pain tends to be more aching than sharp, and usually stays above the knee.
Facet joint syndrome. The facet joints are where one vertebra rides on another, behind the disc. With age or injury — especially twisting while lifting, or sudden acceleration/deceleration — they wear, inflame, and hurt. Pain is felt in the low back, hips, and buttocks, aggravated by twisting, arching back, or side-bending, while touching the toes is usually fine (toe-touch pain radiating below the knee points to the disc instead). Diagnosis is confirmed with numbing blocks of the small nerves serving the joint; lasting treatment comes from radiofrequency ablation — using a precisely placed heated probe to quiet those nerves for months to a year or more, repeatable when the effect fades. This procedure has matured enormously and is now a mainstay of what we do.
Sacroiliac (SI) joint pain. The old-timers called it "lumbago." The SI joint, where the spine meets the pelvis, can be strained by lifting, leaning, or sudden deceleration; sufferers lean away from the painful side and avoid sitting on it. Diagnosis is made by provocative maneuvers and confirmed with a numbing injection into the joint; treatment includes cortisone injections, manipulation, and stabilization exercise. In young adults, SI inflammation (sacroiliitis) can be the first sign of an inflammatory arthritis such as ankylosing spondylitis, which deserves its own workup.
Piriformis syndrome. A fall onto the buttock, a twisting injury under load, or a leg-length difference can injure the piriformis muscle deep in the buttock — which matters because the sciatic nerve passes right beside it. The result is buttock pain plus leg pain that mimics disc sciatica perfectly. Treatment: correct the underlying mechanics (heel lift for leg-length difference), stretch, and a targeted piriformis injection.
Iliolumbar and quadratus lumborum syndromes. Sprains of the ligament tying the lowest vertebra to the pelvis (tender right at belt level over the hip) and strain of the muscle spanning the last rib to the pelvis (tender near the 12th rib, with prominent spasm). Both are common in people who lift while twisting, both are frequently mislabeled "lumbar sprain," and both often respond to a simple local injection plus stretching.
Compression fractures. Responsible for roughly 4% of back pain — from osteoporosis, trauma, long-term steroid use, or cancer. Any movement or weight-bearing hurts; twisting is worst. Modern treatment is far better than it used to be: alongside bone-strengthening medications and bracing, vertebroplasty and kyphoplasty — injecting stabilizing cement into the fractured vertebra through a needle — can relieve pain dramatically in appropriately selected patients.
Spondylolisthesis. Slippage of one vertebra on another (most often L5 on S1), from congenital factors, wear, or trauma. It's easily seen on plain X-rays, causes low back, buttock, and thigh pain, and is managed with core strengthening, bracing, and — when it produces nerve compression — surgery.
Spinal stenosis. Narrowing of the canal around the spinal nerves, usually from the combined wear of bulging discs, enlarged facet joints, and thickened ligaments. The classic story: leg pain, heaviness, or numbness that comes on with walking or standing and eases with sitting or bending forward — which is why stenosis patients can ride a bike comfortably but can't walk the grocery store without leaning on the cart. (Poor leg circulation mimics this, but circulation pain stops immediately with rest; stenosis pain needs 20–30 minutes and a forward bend.) Treatment ranges from epidural injections and flexion-based therapy to surgical decompression.
What to do when your back goes out
Decades of evidence have overturned the old advice. Do not put yourself to bed: bed rest beyond a day or two demonstrably slows recovery. Stay as active as pain allows, return to work gradually — half days at first if needed — and set activity quotas rather than letting pain decide when to stop. Rehabilitate with low-stress aerobic exercise (brisk walking, swimming, biking), strengthen the abdominal core, start a flexibility program, and if you're not clearly improving within a few weeks, see a specialist.
Prevention
Lift with bent knees, carry loads close to the body, use proper equipment rather than heroics, avoid prolonged fixed postures — a brick-sized footrest for one foot helps when standing or sitting long periods — and rotate repetitive tasks. Above all, maintain physical and mental fitness: fit backs get hurt less and heal faster. (Back belts and lumbar corsets, once widely recommended for prevention, haven't held up in studies — don't rely on one in place of a strong core.)
Nonsurgical treatment
Medications. Damaged, pinched tissue swells, and chronic inflammation hurts — so anti-inflammatories are the base layer. For nerve-related pain, medications like gabapentin and duloxetine calm the irritated nerve itself; muscle relaxants help briefly for acute spasm. Long-term opioids are not an effective treatment for chronic back pain.
Epidural steroid injections. Similar in technique to labor epidurals: with monitoring in place, a needle is guided (in modern practice, with X-ray fluoroscopy) to the space just outside the sac surrounding the spinal nerves, and a potent anti-inflammatory corticosteroid — not the bodybuilder kind — is deposited where the disc and nerve are inflamed. Best suited for back pain radiating down the leg, pain after surgery, or pain resisting other care. Relief typically begins two to three days after injection. Roughly 60% of well-selected patients get months of relief; injections are repeated only when they demonstrably help, not automatically as a "series of three." The earlier in the pain's course, the better the odds.
Physical therapy — especially stretching. The question isn't whether, it's when: within days to two weeks of onset. Stretching must address the back, pelvis, and legs, because a stiff segment forces its neighbors to over-move and degenerate. A proven home routine: knees-to-chest (both, then alternating single); pelvic tilts; crossed-knee elbow touches for the obliques; lying trunk twists; crunches with the low back grounded; sit-backs (lowering slowly from a sit-up using your arms as needed); standing side bends; hug-yourself trunk rotations; forward flexion-rotation reaching hand to opposite knee; and wall calf stretches. Twice daily, starting with two repetitions per direction and adding two per week.
Walking, swimming, biking. Walking is the best all-around back exercise — brisk, long strides, arms swinging, head up — and it literally nourishes the discs, which have no blood supply of their own and feed by motion. Swimming unloads a painful spine; biking, with its forward lean, is especially good for stenosis.
Other tools. Ice reduces swelling and nerve sensitivity and helps stretching go better; heat relaxes muscle and boosts blood flow — use whichever works for you, about 15–20 minutes at a time. Spinal manipulation can help acute low back pain in the first month (not recommended with leg-radiating pain; stop if no benefit by a month). Acupuncture has earned a legitimate role for chronic low back pain — Medicare now covers it for that indication. TENS, massage, biofeedback, and psychological techniques all have places in a combined plan, and a leg-length difference approaching an inch should be corrected with a shoe insert.
When surgery — and what else
Spine surgery belongs to neurosurgeons and orthopedic spine specialists, ideally subspecialty-trained, and the odds vary enormously by problem — clear nerve compression with matching symptoms does well; vague pain with a vague scan does not. Repeat operations succeed less often than first ones. An old professor of mine put it best: the hallmark of a great surgeon is knowing when not to operate. Bring every scan and study to the consultation.
For pain that has defeated everything else, spinal cord stimulation offers real help: a thin electrode placed over the spinal cord delivers a tiny current that blocks pain signals, with the whole device — battery included — implanted under the skin. Modern systems have largely solved the lead-movement problems of earlier generations. In my experience stimulators seldom eliminate the need for medication, but they meaningfully reduce it, and for the right patient that's life-changing.
Sex and back pain
A question patients rarely ask and always have: back pain generally should not prevent normal sexual relations, but planning matters. For the partner with back pain, the missionary position tends to be the hardest on the spine; side-lying positions are usually the most comfortable for either partner, and alternatives like standing or the unaffected partner on top work well. Don't be embarrassed to raise this at your visit — it's a quality-of-life issue like any other.
The bottom line
Low back pain has many causes, they masquerade as each other, and the treatment that cures one does nothing for another. Accurate diagnosis first, combined treatment second, patience third. We've been doing exactly that in Newport Beach since 1996. Call Newport Pain Management at (949) 759-8400.
This article is for general education and is not a substitute for individual medical advice.
Ready to get an accurate diagnosis?
Dr. H. Rand Scott, MD has been treating low back pain and sciatica in Newport Beach since 1996. Call us or request an appointment online.