Sciatica: Causes, Symptoms and Treatment
Sciatica refers to pain that travels along the path of the sciatic nerve, from the lower back through the hip and down the leg. A herniated disc is the most common cause.
Things worth knowing about "Sciatica"
Sciatica refers to pain that travels along the path of the sciatic nerve, from the lower back through the hip and down the leg. A herniated disc is the most common cause.
What is Sciatica?
Sciatica (medically known as ischialgia) describes pain that radiates along the path of the sciatic nerve – the largest nerve in the human body. The pain typically originates in the lower back or buttock and travels down the back of the thigh into the lower leg or foot. Sciatica is not a disease in itself but a symptom indicating irritation or compression of the sciatic nerve.
Causes
The most common cause of sciatica is a herniated disc (disc prolapse) in the lumbar spine, where disc material presses on the sciatic nerve. Other causes include:
- Spinal stenosis: Narrowing of the spinal canal that compresses the nerve
- Piriformis syndrome: Irritation of the sciatic nerve by the piriformis muscle in the buttock
- Spondylolisthesis: Slipping of one vertebra over another
- Inflammatory conditions: Such as arthritis or infections
- Tumors or cysts near the spine (rare)
- Pregnancy: Pressure on the sciatic nerve from the growing uterus
Symptoms
Symptoms of sciatica can vary depending on the cause and severity:
- Aching, burning, or sharp pain in the lower back, buttock, and leg
- Numbness or tingling (paraesthesia) in the leg or foot
- Muscle weakness in the affected leg
- Pain that worsens when sitting, coughing, or sneezing
- Pain that typically affects only one side of the body
In severe cases, sciatica may cause muscle paralysis or bladder and bowel dysfunction, which require immediate medical attention.
Diagnosis
Sciatica is diagnosed through a combination of clinical examination and imaging:
- Medical history and physical examination: The doctor assesses reflexes, muscle strength, and sensation
- Straight leg raise test (Lasegue test): A specific provocation test to detect sciatic nerve irritation
- MRI (Magnetic Resonance Imaging): Gold standard for visualizing discs, nerves, and soft tissues
- CT scan: Useful for evaluating bony changes in the spine
- X-ray: To rule out fractures or degenerative changes
Treatment
Treatment depends on the underlying cause and severity. In most cases, sciatica resolves on its own within weeks to months.
Conservative Treatment
- Pain medication: NSAIDs (e.g., ibuprofen, diclofenac) to reduce pain and inflammation
- Physiotherapy: Targeted exercises to strengthen back muscles and relieve nerve pressure
- Heat or cold therapy: To ease acute pain and muscle tension
- Corticosteroid injections: Epidural steroid injections for severe pain relief
- Gentle movement: Moderate walking and light mobility exercises
Surgical Treatment
If conservative treatment fails or neurological deficits (e.g., paralysis) develop, surgery may be required. Common procedures include:
- Microdiscectomy: Removal of the herniated disc tissue pressing on the nerve
- Laminectomy: Widening of the spinal canal to relieve pressure from spinal stenosis
Prevention
The following measures can help reduce the risk of developing sciatica:
- Maintaining a spine-friendly posture in daily life and at work
- Regular exercise and strengthening of core muscles
- Maintaining a healthy body weight to reduce spinal load
- Ergonomic workplace and seating arrangements
- Lifting heavy objects correctly – using the legs, not the back
References
- Koes, B. W., van Tulder, M. W., Peul, W. C. (2007). Diagnosis and treatment of sciatica. BMJ, 334(7607), 1313–1317.
- Ropper, A. H., Zafonte, R. D. (2015). Sciatica. New England Journal of Medicine, 372(13), 1240–1248.
- National Institute of Neurological Disorders and Stroke (NINDS): Low Back Pain Fact Sheet. Available at: https://www.ninds.nih.gov
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