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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.
At a glance
- A slipped (herniated) disc is when the soft centre of a spinal disc bulges out and can press on a nearby nerve.
- In the lower back it commonly causes sciatica; in the neck it can cause arm pain.
- Most cases improve within weeks without surgery.
- Certain nerve symptoms are red flags needing urgent care.
Red-flag symptoms — seek urgent care
Go to A&E or call 995 immediately if you develop numbness around the genitals, buttocks or inner thighs (the “saddle” area), loss of bladder or bowel control (unable to pass urine, or leaking without knowing), or severe or rapidly worsening weakness in one or both legs. Together these can signal cauda equina syndrome, a rare but serious compression of the nerves at the base of the spine. It is a surgical emergency: prompt treatment matters, because delay can lead to permanent loss of bladder, bowel and leg function. Do not wait to see if symptoms settle on their own.
Also seek prompt medical review for pain following a significant fall or accident, fever with back pain, unexplained weight loss, or new back pain in someone with a history of cancer, as these may point to other conditions a doctor should assess.
What it is
The spine is a stack of bones (vertebrae) separated by discs that act as cushions. Each disc has a tough outer ring and a soft, jelly-like centre. A slipped disc — more accurately a herniated or prolapsed disc — happens when the outer ring weakens or tears and some of the soft centre pushes outward. The disc does not literally slip out of place; rather, the bulging material can press on a spinal nerve or the spinal cord nearby, which is what produces many of the symptoms. Herniated discs are commonest in the lower back (lumbar spine), where the load is greatest, and can also occur in the neck (cervical spine). They are far less common in the mid-back.
Symptoms
Symptoms depend on where the disc is and whether it presses on a nerve. A lower-back disc often causes back pain together with pain, tingling, numbness or weakness radiating down one leg — the pattern known as sciatica, which can extend to the buttock, thigh, calf and foot. A neck disc can cause neck pain with similar symptoms spreading into the shoulder, arm or hand. The nerve pain (radiating, sometimes electric or burning) is often more troubling than the back or neck ache itself. Pain is frequently worse with bending, sitting, coughing, sneezing or straining. Importantly, some disc bulges cause no symptoms at all and are found only incidentally on scans.
What causes it
Discs gradually lose water content and become less flexible with age, so the outer ring is more prone to bulging or tearing. A herniation may follow a specific movement — often bending and lifting, or twisting under load — but frequently there is no single clear trigger, with wear building up over time. Sudden strain, awkward lifting or a fall can also precipitate it. In most people it reflects everyday changes in the spine rather than any serious underlying disease.
Who is at risk
Several factors raise the likelihood of a herniated disc:
- Age — most common in adults through the middle years of life.
- Jobs and activities involving heavy lifting, bending or twisting, especially with poor technique.
- Prolonged sitting or sedentary work, and long periods driving.
- Being overweight, which adds load to the lower spine.
- Weak core and back muscles, and low physical fitness.
- Smoking, which is thought to reduce disc nutrition and slow healing.
How it is diagnosed
A doctor can usually diagnose a herniated disc from your history and a physical examination. The examination checks how the pain radiates, along with sensation, reflexes and muscle strength in the affected limb. A common test for lower-back herniation is the straight-leg raise, where lifting the straightened leg reproduces the nerve pain. Imaging is not needed for most people. An MRI scan is generally reserved for symptoms that are severe, persistent, or accompanied by red flags, or when surgery is being considered. This is partly because scans commonly show disc bulges and age-related changes even in people who have no pain at all, so a finding on a scan has to be interpreted alongside your actual symptoms and examination — the scan alone does not dictate treatment.
Course and complications
The outlook is generally good. Most herniated discs improve within a few weeks as inflammation settles and the body gradually reabsorbs some of the bulging disc material, often without any surgery. A minority of people go on to have persistent or recurring pain, or symptoms that come and go over months. The main serious complication is significant nerve compression, which may cause lasting numbness or weakness, and — rarely — the cauda equina syndrome described above, which needs emergency care.
How it is treated
Most herniated discs are managed with conservative (non-surgical) care, and the first principle is to stay gently active. Prolonged bed rest is not advised, as it tends to slow recovery; keeping moving within comfortable limits and returning gradually to normal activity generally helps. Treatment usually combines:
- Physiotherapy — guided exercises to reduce pain, restore movement, and build core and back strength, along with posture and activity advice.
- Pain relief — a doctor or pharmacist can advise on suitable options; several classes of medicine may be used to ease pain and inflammation. (Take any medicine as advised, and check suitability if you have other health conditions.)
- Heat, gentle stretching and pacing of daily activities to work through the acute phase.
If symptoms are severe or do not improve with these measures, a doctor may consider a spinal (epidural) injection to reduce inflammation around the nerve, or surgery to relieve the pressure on the nerve. Surgery is generally reserved for selected cases — significant or progressive nerve involvement that does not settle, disabling persistent pain, or red-flag emergencies. A spine specialist can weigh up the benefits and risks for your situation.
Living with it and self-care
Once the acute phase passes, a few habits help recovery and reduce the chance of recurrence:
- Keep active and build a regular routine of walking and core-strengthening exercise.
- Lift safely — bend at the hips and knees, keep the load close, and avoid twisting while lifting.
- Mind your posture when sitting and working; take regular breaks to stand and move if you sit for long periods.
- Maintain a healthy weight and, if you smoke, consider stopping.
- Return gradually to work, sport and heavier activity rather than all at once.
When to see a doctor
See a doctor — a GP or polyclinic is a good starting point — if back or neck pain radiates into a limb, is severe, or is not improving after a few weeks, or if it comes with numbness or weakness. You may be referred to physiotherapy or to an orthopaedic or spine specialist if symptoms persist. Seek urgent care at A&E or call 995 for any red-flag symptoms — saddle-area numbness, loss of bladder or bowel control, or severe or progressive leg weakness. HealthHub also offers general information on back pain and spine health.
Common questions
Does a slipped disc heal on its own?
Often yes. Many herniated discs improve within weeks to months as the bulge settles and inflammation reduces, without surgery.
Should I rest with a slipped disc?
Short rest may help in the first day or two, but staying gently active generally aids recovery better than prolonged bed rest. Avoid long periods lying down.
When is surgery needed?
For significant or progressive nerve compression that does not improve with conservative care, for disabling persistent symptoms, or urgently for red-flag symptoms such as loss of bladder or bowel control.
Will a scan show what is wrong?
An MRI can show a herniated disc, but scans often reveal disc changes in people with no pain, so results are always interpreted alongside your symptoms and examination. Most people do not need a scan.
Related guides
Sources
- HealthHub Singapore — slipped disc.
- Ministry of Health Singapore — low back pain.
- American Academy of Orthopaedic Surgeons — herniated disc.
This article is for general information only and does not replace a consultation with a qualified doctor. Please seek personalised medical advice for your situation.