Lumbar Spine Conditions

Understanding common causes of lower-back and leg symptoms

The lumbar spine—your lower back—carries substantial load and contains the nerve roots that continue into the legs. This chapter explains several common lumbar conditions, how their symptoms can overlap, and why treatment decisions require more than an MRI finding alone.

Herniated Disc

Quick Overview: A herniated disc occurs when disc material extends beyond its usual boundary. It may irritate or compress a nearby nerve root, but some herniations cause no symptoms.

What Causes a Herniated Disc?

Discs act as cushions between your vertebrae. Over time, the outer layer can weaken and tear, allowing the gel-like center to bulge out. This can happen from:

• Age- and load-related disc change
• Sudden lifting or twisting injuries
• Repetitive strain from work or sports
• Genetic factors that affect disc strength

Common Symptoms

• Sciatica: Sharp, shooting pain down one leg
• Numbness or tingling: Often in the foot or toes
• Weakness: Difficulty lifting your foot or standing on tiptoes
• Lower back pain: May be mild or severe

Diagnosis

A diagnosis combines the history and neurologic examination with imaging when imaging is indicated:

• Physical exam: Assesses strength, sensation, reflexes, gait, and nerve-tension signs
• MRI: Can show discs, nerve roots, and other soft tissues
• X-rays: Can assess alignment, instability, arthritis, and some fractures, but do not directly show a disc herniation

Treatment Options

When there is no time-sensitive neurologic problem, initial care is often nonoperative and may include:

• Physical therapy and core strengthening
• Anti-inflammatory medications
• Epidural steroid injections
• Activity modification

Surgery such as microdiscectomy or endoscopic discectomy may be considered for persistent, function-limiting symptoms that match the examination and imaging, or sooner for certain progressive neurologic deficits. The appropriate technique depends on the location and anatomy of the herniation.

Learn More: Read the complete guide to herniated disc treatment options.

Lumbar Spinal Stenosis

Quick Overview: Lumbar spinal stenosis is narrowing around the nerve roots in the lower spine. When symptomatic, it may cause leg pain, heaviness, numbness, or weakness with standing and walking.

What Causes Spinal Stenosis?

Lumbar stenosis often reflects a combination of changes that accumulate over time:

• Arthritis: Bone spurs and thickened ligaments narrow the canal
• Disc degeneration: Bulging discs take up space
• Facet joint overgrowth: Enlarged joints compress nerves
• Spondylolisthesis: Vertebral slippage narrows the canal

Recognizing the Symptoms

The hallmark symptom is neurogenic claudication—leg pain and weakness that worsens with walking or standing and improves with sitting or bending forward:

• Pain, cramping, or heaviness in both legs
• Numbness or tingling in the legs or feet
• Weakness that limits walking distance
• Relief when sitting, leaning forward, or using a shopping cart

Treatment Approach

When there is no time-sensitive neurologic problem, nonoperative options may include:

• Physical therapy: Core strengthening and flexibility
• Medications: Anti-inflammatories and nerve pain medications
• Epidural injections: Reduce inflammation around compressed nerves
• Activity modification: Using assistive devices, pacing activities

When symptoms remain function-limiting and match the examination and imaging, lumbar decompression surgery may be discussed to create more space for the nerves. Whether fusion is also appropriate depends on stability, deformity, the extent of decompression, and other patient-specific factors.

Learn More: Explore the full guide to spinal stenosis diagnosis and treatment.

Sciatica

Quick Overview: Sciatica describes pain that travels along a sciatic distribution into the buttock and leg. It commonly reflects irritation of a lumbar nerve root, but the underlying cause must be identified.

What Causes Sciatica?

Sciatica is a symptom, not a diagnosis. The underlying causes include:

• Herniated disc: A common cause of lumbar nerve-root irritation
• Spinal stenosis: Narrowing compresses the nerve root
• Spondylolisthesis: Vertebral slippage pinches the nerve
• Non-spine conditions: Hip, vascular, peripheral nerve, and deep-gluteal problems can sometimes mimic sciatica

Typical Symptoms

• Sharp, shooting pain: From lower back through buttock and down the leg
• Numbness or tingling: Often in the calf, foot, or toes
• Weakness: Difficulty moving the foot or leg
• Pain worsens: With sitting, coughing, or sneezing

Treatment Path

For many patients without progressive weakness or another red flag, treatment begins with nonoperative options selected for the suspected cause:

• Physical therapy or a diagnosis-specific home program
• Medication options reviewed in the context of other health conditions and drug interactions
• A targeted injection in selected cases when the suspected pain generator is sufficiently clear
• Heat, cold, pacing, or movement strategies used safely for symptom relief

If disabling symptoms persist, worsen, or are accompanied by an important neurologic deficit, further evaluation can clarify whether an operation would address the cause. Endoscopic discectomy is one possible approach for selected disc herniations; it is not appropriate for every pattern of sciatica.

Learn More: Read the complete sciatica treatment guide.

Spondylolisthesis

Quick Overview: Spondylolisthesis occurs when one vertebra slips forward over the vertebra below it, potentially compressing nerves and causing instability.

Types and Causes

There are several types of spondylolisthesis:

• Degenerative: Related to disc and facet-joint changes in adulthood
• Isthmic: Results from a stress fracture in the vertebra, often from sports in youth
• Congenital: Present from birth due to abnormal bone formation
• Traumatic: Caused by acute injury or fracture

Symptoms to Watch For

• Lower back pain: Worsens with activity, improves with rest
• Leg pain: Similar to sciatica if nerves are compressed
• Tight hamstrings: Difficulty bending forward
• Postural changes: Flattened lower back curve, protruding abdomen

Treatment Options

Treatment depends on the severity of slippage and symptoms:

• Conservative care: Physical therapy, bracing, activity modification
• Medications: Anti-inflammatories and pain management
• Injections: Epidural steroids for nerve pain
• Surgery: May be considered when symptoms and objective findings identify nerve compression, instability, or deformity that an operation can address

Learn More: Explore the detailed spondylolisthesis guide.

Degenerative Disc Disease

Quick Overview: “Degenerative disc disease” describes age- and load-related disc changes seen on imaging. These changes are common, including in people without pain, so they must be interpreted alongside the clinical picture.

Understanding Disc Degeneration

As we age, spinal discs naturally lose water content and become less flexible:

• Loss of hydration: Discs become thinner and less cushioning
• Tears in the outer layer: Can cause pain and inflammation
• Reduced disc height: Alters spine mechanics and may compress nerves
• Bone spurs: Bony changes that may accompany disc and joint degeneration

Common Symptoms

• Chronic lower back pain: May be constant or intermittent
• Pain worsens: With sitting, bending, lifting, or twisting
• Pain improves: With walking, changing positions, or lying down
• Flare-ups: Symptoms may vary over time and with activity

Treatment Strategy

When there is no time-sensitive neurologic problem, nonoperative care is generally considered before surgery:

• Physical therapy: Core strengthening and flexibility exercises
• Medications: Anti-inflammatories and pain management
• Lifestyle modifications: Weight management, ergonomics, activity pacing
• Injections: Epidural steroids or facet joint injections

Surgery is not based on disc degeneration alone. It may be discussed when a carefully evaluated pain or neurologic pattern remains substantially limiting, objective findings are concordant, reasonable nonoperative care has not met the patient’s goals, and the expected benefit justifies the risks. Options may include lumbar fusion or, for a narrow group of patients, disc replacement.

Learn More: Read the comprehensive degenerative disc disease guide.

Key Takeaways

• Many lumbar symptoms can be managed without surgery, but the plan and pace should match the diagnosis, neurologic examination, and functional impact.
• Accurate diagnosis is essential—symptoms can overlap, and treatment depends on identifying the specific cause of your pain.
• Surgery is considered when there is a surgically addressable problem and the anticipated benefit outweighs the patient-specific risks; urgent neurologic conditions follow a different pathway.
• A minimally invasive approach is a technique, not an indication. It may reduce tissue disruption in selected operations, but it does not remove the risks of surgery or guarantee a particular recovery.

New loss of bladder or bowel control, saddle numbness, or sudden or rapidly worsening leg weakness requires emergency medical evaluation.

Medical Disclaimer: This chapter provides educational information only and is not intended as personal medical advice. Every patient’s condition is unique. Consult with Dr. Greenberg or another qualified spine specialist for an accurate diagnosis and personalized treatment plan.