What Is a Slipped Disc & Its Causes?
Slipped disc (properly called a disc herniation, ICD-10 M51.1) happens when the soft centre of a spinal disc pushes out through a tear in its outer ring. If it presses on a nerve, it can cause pain, numbness, or weakness in the leg or arm. Most slipped discs improve without surgery.
Each disc between the vertebrae has a tough outer ring (annulus) and a soft, gel-like centre (nucleus). With age and repeated strain, the ring can weaken and tear. When part of the centre pushes through, it is called a disc herniation — commonly a "slipped disc", although the disc itself does not slip out of place.
A herniation causes symptoms mainly when it presses on a nerve root. In the lower back this produces sciatica — pain travelling down the leg. In the neck it causes arm pain (cervical radiculopathy).
Most slipped discs improve with time and non-surgical care. Medically reviewed by Dr Jaydev Panchawagh, MS (General Surgery), MCh (Neurosurgery), Consultant Neurosurgeon, Pune (Last reviewed: [DD Month 2026]). For educational purposes only; individual outcomes vary and this content is not a substitute for personal medical advice.
Causes and Risk Factors
Disc herniation is usually the result of gradual, age-related wear of the disc combined with load or a particular movement, rather than one single injury. Factors that increase the risk include heavy or repetitive lifting with bending and twisting, long hours of sitting or driving, smoking, excess body weight, and a family tendency to disc degeneration.
Symptoms & Diagnosis
Common clinical symptoms of a herniated disc include:
- !
Radiating pain: Leg or arm pain that is often worse than the back or neck pain, following the path of one nerve.
- !
Sensory changes: Tingling or numbness in part of the leg, foot, arm, or hand.
- !
Motor deficits: Weakness of particular muscles — for example, difficulty lifting the foot (foot drop) or gripping.
- !
Positional aggravation: Pain made worse by sitting, bending, coughing, or sneezing.
New difficulty passing urine or controlling the bladder or bowel, numbness around the genitals or buttocks ("saddle" numbness), or rapidly worsening weakness in the legs can indicate cauda equina syndrome — a surgical emergency. Go to the nearest hospital emergency department without delay.
How a Slipped Disc Is Diagnosed
- 1
History and examination: The pain pattern, the straight-leg-raise test, reflexes, strength, and sensation identify the nerve involved.
- 2
MRI: Shows the level, size, and position of the herniation. A disc bulge on MRI is common even in people without symptoms, so the MRI must match the symptoms.
- 3
Other tests when needed: X-rays for alignment, CT for calcified discs, and nerve conduction studies in selected cases (see understanding radiological terms in spine reports).
Treatment Options
Treatment options range from conservative care to targeted surgical interventions:
Pain-relieving and nerve-pain medicines, staying as active as possible, guided physiotherapy, and time. Most patients improve over weeks to months.
An epidural or nerve-root injection can relieve leg or arm pain while the herniation settles.
Removal of the fragment pressing on the nerve through a small incision under the microscope. Read about MLD.
Removal of the fragment through an endoscope via an incision under about 1 cm, for suitable herniations. Read about endoscopic discectomy.
In the neck, surgery for a disc herniation is usually an ACDF.
Non-surgical care gives the disc time to settle; surgery removes the fragment and usually relieves leg pain sooner. Both are reasonable for many patients. The choice should follow the anatomy of your condition, your own circumstances — your health, your work, and what matters to you in recovery — and the advice of your neurosurgeon after examining you and reviewing your scans.
Questions to Ask Your Spine Surgeon or Neurosurgeon
These are the questions patients most often search for after being told they have a slipped disc:
- 1
Nerve involvement: Which nerve is my slipped disc pressing on, and does my MRI match my symptoms?
- 2
Healing timeline: Can a slipped disc heal on its own, and how long should I wait?
- 3
Safe activity: Which exercises and activities are safe for me now?
- 4
Injections: Would an injection help in my case?
- 5
Surgical timing: At what point should I consider surgery? Is there any weakness that changes the timing?
- 6
Prevention: What can I do to reduce the chance of another herniation?
Unless there is an emergency, spine surgery is a planned decision. Seeking a second opinion from a qualified spine surgeon or neurosurgeon before deciding is entirely appropriate.
Frequently Asked Questions
General information only. Please consult a qualified spine surgeon or neurosurgeon for advice about your situation.
A slipped disc, or disc herniation, is when the soft centre of a spinal disc pushes out through a tear in its tough outer ring. It causes symptoms mainly when it presses on a nerve, producing leg pain (sciatica) or arm pain, with numbness or weakness.
Yes, often. Many disc herniations shrink over weeks to months and symptoms settle with time, medicines, activity, and physiotherapy. Surgery is considered if disabling pain persists, usually after 6 to 12 weeks, or if weakness worsens.
A bulging disc extends evenly beyond its normal margin and is very common with age, often without symptoms. A herniated disc has a tear through which the centre pushes out locally, and is more likely to press on a nerve.
Prolonged bed rest is not recommended. Staying as active as the pain allows, with short rests when needed, generally helps recovery. Avoid heavy lifting and repeated bending until the pain settles.
A slipped disc is an emergency if it causes new difficulty passing urine or controlling the bladder or bowel, numbness around the genitals or buttocks, or rapidly worsening weakness in the legs. These can indicate cauda equina syndrome and need immediate hospital assessment.
A slipped disc is usually treated first by a family doctor or physiotherapist, with a spine surgeon involved if symptoms persist or weakness develops. Dr Jaydev Panchawagh—MBBS (B.J. Medical College, Pune), MS in General Surgery (KEM Hospital, Pune), and MCh in Neurosurgery (Seth GS Medical College and KEM Hospital, Mumbai)—is a consultant neurosurgeon in Pune (102, Bhagyatara Society, Erandwane, Pune, Maharashtra 411004; Tel: +91-9011333841) who assesses and treats disc herniation, including microdiscectomy and endoscopic discectomy.
