Herniated Disc:
Symptoms, Treatment & When Surgery Makes Sense
At a glance
FrequencyOne of the most common specific back-pain diagnoses - mainly affects the lumbar spine
Usually benignThe great majority improve without surgery - conservative treatment is usually the first-line approach
Main symptomPain radiating into the leg (sciatica) or into the arm - depending on the level of the herniation
TreatmentPain management, movement, physiotherapy - surgery only for certain indications
EmergencyCauda equina syndrome (bladder/bowel dysfunction, saddle anesthesia) - to the emergency department immediately
ICD-10M51 (intervertebral disc disorders)
1. What is a herniated disc?
The intervertebral discs sit as elastic cushions between the vertebral bodies and enable the mobility of the spine. With a herniated disc (disc prolapse), the soft gel-like core of the disc pushes outward through the outer fibrous ring and can press on neighboring nerve structures.1
The good news: the great majority of herniated discs improve without surgery. The part of the disc that has leaked out is often broken down by the body over time (resorption). Conservative treatment - pain management, movement, physiotherapy - is usually the first-line approach.1,2
Not every finding is a disease
Not every herniated disc causes symptoms. Many herniated discs are incidental findings on MRI in people with no symptoms at all. Only the combination of the finding and matching symptoms leads to a diagnosis that is relevant for treatment.
2. Types and location
Stages
Disc bulge (protrusion)
The fibrous ring is still intact, but the disc bulges outward. Can cause symptoms but is not a complete rupture.
Herniated disc (prolapse)
The fibrous ring tears and disc material pushes outward. Can press on nerves.
Sequestration
A detached piece of disc material lies free in the spinal canal. Can resorb spontaneously.
Locations
Lumbar spine - the most common location
Typical levels: L4/L5 and L5/S1. Often leads to sciatic pain (radiating into the leg).
Cervical spine
Less common, but also relevant. Leads to pain, tingling, or numbness in the arm and hand.
Thoracic spine
Very rare.
3. Symptoms
Herniated disc of the lumbar spine
- Pain radiating into the leg (sciatica) - often as far as the foot; the main symptom
- Back pain - can occur, but does not have to
- Tingling, numbness, or a pins-and-needles feeling in the leg or foot
- Muscle weakness - e.g. foot-drop weakness (the foot cannot be lifted)
- Worsening when coughing, sneezing, or straining
Herniated disc of the cervical spine
- Pain radiating into the shoulder, arm, or hand
- Tingling, numbness in the fingers or hand
- Neck pain, neck stiffness
EMERGENCY: cauda equina syndrome - to the emergency department immediately
Sudden numbness in the genital/anal area (saddle anesthesia), bladder or bowel dysfunction, increasing paralysis in the legs - this is an emergency! This condition usually requires emergency surgery within hours, since delay can lead to permanent damage. Call the emergency number if needed - 112 across the EU, or 999 or 112 in the UK.
4. Causes and risk factors
- Degenerative changes: the discs lose elasticity and water content over the course of life. This is a normal aging process and the most common basis for a herniated disc.
- Lack of movement: weak back muscles and limited mobility favor herniated discs.
- Excess weight: obesity increases the strain on the discs.
- Heavy physical strain: frequent heavy lifting, vibration (e.g. driving a truck).
- Smoking: worsens the blood supply to the discs.
- Genetics: a family predisposition plays a role.
5. Diagnosis
- History and physical examination: the most important basis. Typical pain radiation, reflexes, strength, and sensation are tested. The straight-leg-raise test (Lasègue's sign) can give clues to nerve root irritation.
- MRI (magnetic resonance imaging): the imaging of choice when a herniated disc is suspected. Shows the herniation, the nerve compression, and accompanying changes.
Imaging - not always straight away
Imaging should usually only be done when red flags are present, surgery is being considered, or the symptoms do not improve despite conservative treatment. An MRI for acute symptoms without warning signs is mostly not necessary - and can even lead to overdiagnosis and unnecessary procedures.1
More: preparing for a doctor's appointment.