Sciatica vs Herniated Disc: Understanding the Difference
The Short Answer
Sciatica is a symptom — pain that radiates along the sciatic nerve, typically from the lower back through the buttock and down one leg. A herniated disc is a structural condition — when the soft inner material of a spinal disc pushes through its outer wall.
A herniated disc is one of the most common causes of sciatica, but they’re not the same thing. Understanding this distinction is important because it affects how your condition is diagnosed and treated.
What Is Sciatica?
Sciatica describes pain that follows the path of the sciatic nerve — the longest nerve in your body, running from your lower back through your hips and buttocks and down each leg.
Common symptoms include:
- Sharp, shooting pain from the lower back into the leg
- Burning or tingling sensation in the leg or foot
- Numbness or weakness in the affected leg
- Pain that worsens with sitting, coughing, or sneezing
- Typically affects only one side of the body
Sciatica is not a diagnosis in itself — it’s a description of symptoms. The key question is: what’s compressing or irritating the sciatic nerve?
What Is a Herniated Disc?
Between each vertebra in your spine sits a disc — a tough, rubbery cushion with a soft, gel-like centre. A herniated disc (also called a slipped disc or ruptured disc) occurs when the soft centre pushes through a crack in the tougher outer layer.
This can cause:
- Local back pain at the site of the herniation
- Radiating pain if the disc material presses on a nerve
- Numbness or tingling in the area served by the affected nerve
- Muscle weakness in the affected area
- In some cases, no symptoms at all
Not all herniated discs cause sciatica, and not all sciatica is caused by a herniated disc.
How Are They Connected?
The lumbar spine (lower back) is the most common location for disc herniations. When a disc herniates in the lower back — particularly at the L4-L5 or L5-S1 levels — the protruding disc material can press on the nerve roots that form the sciatic nerve.
This compression is what produces the characteristic shooting pain down the leg that we call sciatica.
Other causes of sciatica include:
- Spinal stenosis — narrowing of the spinal canal
- Piriformis syndrome — the piriformis muscle in the buttock compresses the nerve
- Spondylolisthesis — a vertebra slips forward over the one below it
- Degenerative disc disease — age-related changes in the discs
How We Diagnose the Difference
At Costa Blanca Movement Centre, we use a thorough assessment process to determine exactly what’s causing your symptoms:
- Medical history — when symptoms started, what makes them better or worse, any previous injuries
- Physical examination — specific tests for nerve compression, range of motion, muscle strength, and reflexes
- Movement assessment — how you move, stand, and sit can reveal a lot about the underlying cause
- Imaging referral — if needed, we can refer you for MRI or X-ray to confirm the diagnosis
A precise diagnosis is essential because it determines the most effective treatment approach.
Treatment Options
The good news is that the vast majority of both sciatica and herniated discs respond well to conservative, non-surgical treatment. At our clinic, treatment options include:
For sciatica (regardless of cause):
- Spinal decompression therapy to reduce nerve compression
- Manual therapy to improve spinal mobility
- Specific exercises to relieve nerve tension
- Postural education and ergonomic advice
For herniated discs specifically:
- Spinal decompression to create negative pressure and encourage disc retraction
- Progressive exercise programme to stabilise the spine
- Pain management strategies
- Activity modification guidance during the acute phase
Most patients see significant improvement within 4–6 weeks of consistent treatment. Surgery is rarely necessary and is typically only considered when conservative treatment fails after an extended period.
When to Seek Immediate Help
While most cases of sciatica and herniated discs improve with proper treatment, certain symptoms require urgent medical attention:
- Loss of bladder or bowel control
- Progressive weakness in both legs
- Numbness in the saddle area (inner thighs and buttocks)
- Severe, worsening pain that doesn’t respond to any position change
These symptoms may indicate cauda equina syndrome, a rare but serious condition that requires emergency treatment.
Next Steps
If you’re experiencing back pain with leg symptoms, don’t wait for it to resolve on its own. Early assessment and treatment lead to faster recovery and better long-term outcomes.
Book an assessment at Costa Blanca Movement Centre in Torrevieja. We’ll identify exactly what’s causing your symptoms and create a clear, personalised treatment plan.