Understanding the True Sources of Sciatica — And How the Right Diagnosis Leads to Lasting Relief

Sciatica is one of the most common reasons people seek care for low back and leg pain. Many assume it’s a single condition, but “sciatica” simply describes symptoms — pain, tingling, numbness, or weakness that travels from the lower back into the buttock and down the leg along the sciatic nerve.

The key to lasting relief is identifying where the irritation is actually coming from. At Ocean State Sport & Spine, Jeffrey C. Smith, chiropractic physician, focuses on pinpointing the true cause of sciatic pain so treatment is precise, effective, and long-lasting. Below are three of the most common sources of sciatica seen in clinical practice.

1. Lumbar Disc–Related Sciatica

The most well-known cause of sciatica originates in the lower spine, often at L4-L5 or L5-S1. When a spinal disc bulges or herniates, it can irritate a nerve root that forms the sciatic nerve.

Common Causes:

• Degeneration over time

• Lifting or twisting injuries

• Prolonged sitting and poor posture

• Repetitive stress from work or sports

Typical Symptoms:

• Sharp, shooting pain down one leg

• Pain worsened by sitting, bending, coughing, or sneezing

• Numbness or weakness in the leg or foot

Disc-related sciatica often responds best to a combination of spinal adjustments, decompression strategies, core stabilization exercises, and movement correction. A careful orthopedic and neurological exam helps determine whether the disc is truly the source.

2. Piriformis Syndrome

The Piriformis muscle is a small muscle located deep in the buttock. The sciatic nerve runs underneath it — and in some individuals, directly through it. If this muscle becomes tight or inflamed, it can compress or irritate the nerve.

Common Causes:

• Prolonged sitting

• Running or repetitive athletic activity

• Hip muscle imbalances

• Direct trauma to the buttock

Typical Symptoms:

• Deep aching pain in the buttock

• Increased pain with sitting

• Tenderness in the gluteal region

• Sciatic-like pain without significant low back pain

Unlike disc-related sciatica, piriformis syndrome usually involves minimal spinal findings. Treatment focuses more on muscle release techniques, corrective exercise, hip stabilization, and posture improvement.

3. Sacroiliac (SI) Joint Dysfunction

The Sacroiliac joint connects the base of the spine to the pelvis. When this joint becomes restricted, inflamed, or unstable, it can refer pain into the buttock and leg — often mimicking classic sciatica.

Common Causes:

• Falls or trauma

• Pregnancy-related ligament laxity

• Leg length differences

• Repetitive asymmetrical movements

Typical Symptoms:

• One-sided lower back or buttock pain

• Pain when standing up from sitting

• Discomfort when rolling over in bed

• Pain aggravated by prolonged standing

SI joint dysfunction requires specific joint assessment and targeted correction. Treating it like a disc problem can delay recovery — which is why a thorough evaluation is essential.

Why Accurate Diagnosis Matters

Sciatic pain is not one-size-fits-all. Treating the wrong structure can prolong discomfort and lead to recurring flare-ups.

At Ocean State Sport & Spine in North Kingstown, Dr. Jeffrey C. Smith performs comprehensive orthopedic, neurological, and movement assessments to determine the precise source of irritation. From there, care is customized and may include:

• Specific chiropractic spinal and pelvic adjustments

• Spinal decompression treatments and exercises

• Soft tissue therapy

• Corrective and stabilizing exercises

• Postural and ergonomic guidance

• Sport- and activity-specific rehabilitation

  
  

A Personalized Approach to Sciatica Relief

Whether your sciatica pain stems from a lumbar disc, the piriformis muscle, or the SI joint, proper identification is the foundation of effective treatment. Many patients are relieved to learn that most cases of sciatica do not require surgery or injections — and that conservative, evidence-informed care can often resolve pain and restore normal movement and function. Conservative treatments are recommended first.

If you’re struggling with persistent low back or leg pain, a detailed evaluation can help determine the true source and create a clear plan for recovery.

Dr. Jeffrey C. Smith has been diagnosing and treating sciatica for many years and is committed to helping patients in North Kingstown and surrounding communities return to the activities they love — safely and confidently.