What Is Sciatica?

Sciatica is not a diagnosis in itself — it's a symptom. It describes pain that follows the path of the sciatic nerve, which runs from the lower back, through the buttocks, and down each leg. When this nerve becomes compressed or irritated, the result is often a sharp, burning, or shooting pain that can extend all the way to the foot.

Despite being very common, sciatica is frequently misunderstood. Many people assume any lower back pain is sciatica, but true sciatica involves nerve pain that travels down the leg — not just localized back pain.

What Causes Sciatica?

Sciatic nerve irritation is almost always caused by something compressing the nerve along its path. The most common causes include:

Herniated Disc

The most frequent cause. When a spinal disc bulges or ruptures — often at the L4-L5 or L5-S1 level — the protruding material can press directly on the sciatic nerve root. This often happens gradually from disc degeneration or suddenly from lifting with poor form.

Bone Spurs

Bone spurs (osteophytes) are bony overgrowths that develop along vertebral edges as the spine ages. If they form near nerve exit points, they can narrow the space the sciatic nerve travels through, causing compression.

Piriformis Syndrome

The piriformis muscle in the buttock lies close to the sciatic nerve. In some people, the nerve actually runs through the muscle. When the piriformis tightens or goes into spasm, it can squeeze the nerve — a condition sometimes called "pseudo-sciatica."

Spinal Stenosis

Age-related narrowing of the spinal canal can compress nerve roots, causing sciatic-type symptoms particularly during walking or prolonged standing.

Recognizing Sciatica: Key Symptoms

  • Pain that starts in the lower back or buttock and travels down one leg (rarely both)
  • Burning, shooting, or electric-shock-like sensation along the leg
  • Numbness or tingling in the leg, calf, or foot
  • Muscle weakness in the affected leg
  • Pain that worsens when sitting, sneezing, or coughing
  • Relief when walking or lying down in certain positions

Treatment Options

Conservative (First-Line) Approaches

The majority of sciatica cases resolve within 6–12 weeks with conservative care:

  • Staying active: Bed rest is not recommended. Gentle movement and walking help reduce nerve inflammation and maintain muscle function.
  • Heat and cold therapy: Cold reduces acute inflammation in the first few days; heat helps relax muscle tension thereafter.
  • Stretching: Piriformis stretches and gentle spinal mobilization exercises can take pressure off the sciatic nerve.
  • Over-the-counter pain relief: NSAIDs (like ibuprofen) reduce both pain and inflammation when used appropriately.

Physical Therapy

A physiotherapist can identify the specific cause of your sciatica and prescribe targeted exercises to correct it. Core strengthening, nerve gliding exercises, and postural correction are all commonly used approaches.

Medical Interventions

For persistent or severe cases, a doctor may recommend:

  • Prescription anti-inflammatory medications or muscle relaxants
  • Epidural steroid injections to reduce nerve inflammation directly
  • Surgery (microdiscectomy or laminectomy) — reserved for cases with severe neurological symptoms or those that don't respond to conservative treatment

When to Seek Immediate Medical Attention

While sciatica is usually manageable, certain signs require urgent care:

  • Loss of bladder or bowel control
  • Sudden, severe weakness in the leg
  • Pain following a significant trauma
  • Progressive neurological symptoms

The Bottom Line

Sciatica is painful but highly treatable. Understanding its cause is key to choosing the right treatment. With the right combination of movement, targeted stretching, and medical guidance when needed, most people recover fully and can prevent recurrence through ongoing core strength and posture habits.