Sciatica is nerve pain that travels from the lower back down through the buttock and leg, caused by irritation or compression of the sciatic nerve, but many people are diagnosed with sciatica when they actually have a different condition. The key to effective treatment is understanding what's actually compressing the nerve, not just confirming that nerve pain exists. This distinction matters because the underlying cause determines whether you need physical therapy, injections, surgery, or something else entirely.

What Is True Sciatica, and How Do You Know If You Have It?

Sciatica is the common name for nerve pain that follows the path of the sciatic nerve, the longest nerve in the body, which begins in the lower back, runs through the hips and buttocks, and travels down the back of each leg. Medically, sciatica is a symptom of an underlying condition called lumbar radiculopathy, which happens when something compresses, pinches, or irritates one of the nerve roots in the lower spine that bundles into the sciatic nerve.

Here's where diagnosis gets tricky: true sciatica is one-sided. Pain that travels from the lower back into one buttock, down the back of the thigh, and sometimes past the knee into the calf or foot is classic sciatica. Pain that stays only in the lower back is usually something else entirely. This is why getting an accurate diagnosis from a spine specialist matters so much.

What Are the Actual Symptoms of Sciatica?

Sciatica symptoms vary depending on which nerve root is involved and how severely it is being compressed. Understanding these symptoms helps you recognize whether your pain pattern matches true sciatica or suggests a different problem.

• Sharp, burning, or electric pain: Radiates from the lower back into one buttock and down the leg, often described as a shooting sensation.
• Numbness or tingling: Occurs in the buttock, thigh, calf, or foot on the affected side, sometimes called "pins and needles" sensation.
• Weakness in the leg or foot: For example, a foot that feels heavy or that drags when walking, making stairs or walking difficult.
• Pain that changes with position: Worsens when sitting, coughing, sneezing, or bending forward, but improves when lying down or standing.
• Severe cases: Loss of bladder or bowel control, which is a medical emergency requiring immediate care.

One critical red flag: sciatica almost always affects only one side of the body. Pain on both sides at the same time is rare and may signal a more serious condition called cauda equina syndrome, which requires emergency evaluation.

What Actually Causes Sciatica?

Sciatica is caused by anything that irritates or compresses one of the nerve roots in the lumbar spine. Understanding the specific cause is essential because different causes respond to different treatments.

• Herniated lumbar disc: When the soft inner material of a spinal disc pushes through its outer wall and presses against a nerve root, this is the most common cause of sciatica in adults under 50.
• Lumbar spinal stenosis: Narrowing of the spinal canal due to age-related changes, and the most common cause of sciatica in adults over 60.
• Bone spurs (osteophytes): Bony overgrowths that develop with arthritis and can pinch nerve roots as the spine ages.
• Spondylolisthesis: When one vertebra slips forward over another, narrowing the space where the nerve exits the spine.
• Piriformis syndrome: When the piriformis muscle in the buttock spasms or tightens around the sciatic nerve, sometimes called "deep buttock pain syndrome."
• Pregnancy: The weight of the growing baby and changes in posture can compress the sciatic nerve during pregnancy.
• Trauma: A fall, motor-vehicle accident, or sports injury that injures the lumbar spine can trigger sciatica.

How Do Doctors Diagnose Sciatica Correctly?

Diagnosing sciatica is a process of identifying what is compressing the nerve, not just confirming that the nerve is the source of pain. A thorough evaluation typically includes multiple steps to pinpoint the exact cause.

The first step is a detailed medical history. Your provider will ask about when the pain started, what triggered it, where it travels, what makes it better or worse, and any history of back injuries or surgeries. This conversation often reveals patterns that point toward the underlying cause.

Next comes a focused physical and neurologic exam. This includes the straight-leg raise test, reflex testing, strength testing of specific muscle groups, and sensation testing. Together, these tests often pinpoint exactly which nerve root is involved and how severely it's being compressed.

Imaging is ordered when indicated. MRI is the most common imaging study for sciatica because it shows soft tissue including discs, nerves, and the spinal canal. X-rays are helpful for evaluating bony alignment, fractures, and spondylolisthesis. Importantly, some sciatica causes, like piriformis syndrome, do not show on standard imaging at all, which is why clinical examination is so critical.

How to Treat Sciatica: A Step-by-Step Approach

Most sciatica resolves with conservative treatment within six to twelve weeks. Spine specialists use a stepped-care approach, starting with the least-invasive options that match your specific cause and severity, and only progressing to more advanced interventions when conservative care is not enough.

• Physical therapy: Targeted exercises, manual therapy, dry needling, and pelvic traction reduce nerve irritation and strengthen the muscles that support the lumbar spine, allowing you to return to normal activities.
• Activity modification: Short-term avoidance of the postures and movements that worsen your specific sciatica pattern, such as prolonged sitting or forward bending.
• Anti-inflammatory medication: NSAIDs (nonsteroidal anti-inflammatory drugs) such as ibuprofen or naproxen reduce inflammation around the nerve root and provide pain relief.
• Muscle relaxants: Short-course use to break the cycle of muscle spasm that often accompanies sciatica and limits your ability to move.
• Heat and cold therapy: Alternating ice for inflammation and heat for muscle relaxation at home can provide symptom relief between professional treatments.

When physical therapy and oral medication are not enough, targeted injections under fluoroscopic (live X-ray) guidance offer the next level of care.

"Lumbar epidural steroid injections deliver anti-inflammatory medication directly to the inflamed nerve root, often providing significant relief that lets you fully engage with physical therapy," explained Dr. Steven Ganzel, a double board-certified physician in Physical Medicine and Rehabilitation and Interventional Pain Management.

Dr. Steven Ganzel, Physical Medicine and Rehabilitation and Interventional Pain Management Physician

Other injection options include selective nerve root blocks, which are used both diagnostically to confirm which nerve is responsible and therapeutically to provide relief; facet joint injections when the small joints between vertebrae are contributing to the pain pattern; and lumbar sympathetic blocks for select cases of complex regional nerve pain.

Surgery is considered when sciatica does not improve with conservative care after six to twelve weeks, when there is progressive weakness or numbness, or when the underlying anatomy clearly will not improve without surgical decompression. Minimally invasive spine surgery options are available for patients who meet these criteria.

The key takeaway is this: sciatica is not a one-size-fits-all diagnosis. Getting an accurate diagnosis from a spine specialist who understands the underlying cause of your nerve compression is the first step toward effective treatment and relief.