Herniated Disc

Spinal discs are pressure-bearing cushions with a tough fibrous ring around a gel-like core. When the ring tears, the core can herniate outward and compress an adjacent nerve root. The defining feature is not back pain but radiating pain: sciatica down the buttock and leg from a lumbar herniation, or pain into the shoulder and arm from a cervical one, often with numbness, tingling or weakness following that nerve's territory. Coughing, sneezing and sitting typically worsen it. The reassuring reality is that most herniations resolve spontaneously — imaging studies show the herniated material shrinks and is reabsorbed over months, and roughly 90% of people improve without surgery within six to twelve weeks. Imaging is also famously misleading: MRI scans of pain-free adults show disc bulges in a large proportion, so the scan must match the symptoms rather than drive treatment on its own. Management centres on staying active within tolerable limits, effective pain relief so movement is possible, and physiotherapy. Surgery is reserved for persistent disabling symptoms after conservative treatment, progressive weakness, or the emergency of cauda equina syndrome.

• •Radiating pain down one leg past the knee (sciatica) or into the arm from a neck herniation
• •Numbness or tingling in a specific band of skin following the affected nerve
• •Weakness in specific muscles: foot drop, difficulty on tiptoes, or weak grip
• •Pain worsened by coughing, sneezing, straining or prolonged sitting
• •Back or neck pain, often less prominent than the limb pain
• •Relief from lying down or particular positions
• •Loss of bladder or bowel control with saddle numbness — a surgical emergency

• •Age-related disc degeneration, peaking between 30 and 50
• •Heavy lifting, particularly with a bent and twisted spine
• •Sudden strain or awkward movement
• •Prolonged sitting and sedentary work
• •Obesity increasing spinal load
• •Smoking, which impairs disc nutrition and accelerates degeneration
• •Occupational whole-body vibration such as driving heavy vehicles
• •Genetic predisposition to early disc degeneration
• •Repetitive bending and lifting occupations

Age-related disc degeneration dries the core and weakens the fibrous ring, so herniation is most common in middle age when the core is still gel-like enough to extrude but the ring has begun to fail. Mechanical loading — heavy lifting with a flexed and rotated spine, sustained sitting, vibration — raises intradiscal pressure. Nerve pain arises from both direct compression and chemical inflammation, as extruded nucleus material provokes an intense inflammatory response around the nerve root; this is why the pain can be severe with modest compression, and why it settles as inflammation subsides.