What Are the Symptoms of Sciatica?
Sciatica symptoms can range from an occasional ache to pain that makes sitting, standing, walking or sleeping difficult. The exact pattern depends on which nerve is affected and what is irritating it.
When Is Sciatica an Emergency?
If you experience loss of bladder or bowel control alongside leg pain, seek medical attention immediately. This may indicate cauda equina syndrome, a rare but serious condition requiring urgent treatment.
What Causes Sciatica?
Sciatica develops when the sciatic nerve becomes irritated, compressed or inflamed. Common causes include:
| Contributing Factor | How It Plays a Role |
|---|---|
| Herniated (Slipped) Disc | Disc material may irritate or press on a nearby nerve root in the lower spine. [→ Learn more about slipped disc] |
| Spinal Stenosis | Narrowing around the spinal nerves can reduce the space available and cause radiating leg symptoms.[→ Learn more about spinal stenosis] |
| Spondylolisthesis | One vertebra moves forward relative to the one below, which may narrow the space around a nerve. |
| Piriformis Syndrome | Irritation near the piriformis muscle in the buttock can affect the nearby sciatic nerve and resemble spinal sciatica. [→ Learn more about piriformis syndrome] |
| Pregnancy | Pregnancy The growing uterus and shifting centre of gravity can place pressure on the sciatic nerve, particularly in the second and third trimesters. |
| Disc Degeneration and Bone Spurs | Age-related disc thinning and bony growths can narrow the space through which nerve roots leave the spine. |
Who Is at Risk of Sciatica?
Note: You may be at greater risk of developing sciatica if you sit for extended hours, carry excess weight, smoke, have diabetes or osteoarthritis, or have a history of spinal injury.
What Are The Types Of Sciatica?
Sciatica can arise from structures within or outside the spine. Identifying the likely source is important because the symptoms may feel similar, while the appropriate treatment may differ.
| Types of Sciatica | |
|---|---|
| Spinal Nerve Root Sciatica (Radiculopathy) | This occurs when a nerve root in the lower spine becomes irritated or compressed. Possible causes include a slipped disc, spinal stenosis or spondylolisthesis. |
| Extra-Spinal Sciatica | TThis occurs when the sciatic nerve is irritated outside the spine. Piriformis syndrome is one possible cause. Other conditions may also produce symptoms that resemble sciatica, so a clinical assessment may be needed to identify the likely source. |
How Is Sciatica Diagnosed?
Assessment usually begins with a clinical history and physical examination. Your doctor will ask about the location, pattern and behaviour of your pain and may perform tests such as the straight leg raise to look for signs of nerve root tension.
Imaging and nerve tests may be used to look for structural or nerve-related causes:
- X-ray: assesses spinal alignment, disc height and bony changes
- MRI: visualises disc herniation, nerve root compression and spinal stenosis
- CT scan: may be used when MRI is unavailable or when more bony detail is needed
- Nerve conduction studies or EMG: may be ordered in complex cases to assess nerve damage and distinguish spinal from peripheral nerve causes
Imaging alone does not always identify the source of pain. Disc bulges and mild stenosis can appear on MRI in people without symptoms, so scan findings should be considered together with the clinical assessment.
The Painostic® Approach to Sciatica Diagnosis
Pain can feel different from one person to another, even when scan findings appear similar. At Singapore Paincare, our pain specialists use the Painostic® approach to assess the likely source of sciatica.
The assessment considers how the pain started, where it travels, what triggers or relieves it, and how it affects movement, sleep and daily activities. Examination findings and available scans or tests are also reviewed together with your symptoms.
The Painostic® Approach to Sciatica Diagnosis
The Painostic® process is guided by three proprietary protocols:
Diagnostic Formulation
A multidimensional assessment that considers the individual nature of your pain, including its pattern, possible physical cause, how your nervous system processes it and its impact on your daily life.
Injection Roadmap
When an injection is clinically appropriate, a structured planning process is used to select a suitable treatment technique and identify the area to be targeted.
Injection Technique
A refined approach to determining needle depth and placement, helping medication reach the intended treatment area accurately.
Not every patient will require an injection. Your specialist will explain the appropriate options based on your assessment and involve you in decisions throughout your care.
Who Should I See for Sciatica?
The right starting point depends on how long you have had symptoms, how they affect you and whether there are signs of significant nerve involvement.
| Your Situation | A Possible Next Step |
|---|---|
| Mild symptoms that started recently, without weakness or warning signs | A GP can provide an initial assessment, medication advice and referral if needed. |
| Symptoms are improving, but movement, strength or confidence remain affected | A physiotherapist can guide suitable movement, strengthening and rehabilitation after serious causes have been excluded. |
| Pain keeps returning, travels into the leg or has not improved with initial care | A pain specialist can assess whether the symptoms are coming from a spinal nerve, disc or another pain source, and whether targeted non-surgical treatment should be considered. |
| There is progressive weakness or a structural problem that may require surgery | An orthopaedic spine surgeon or neurosurgeon may assess whether surgical treatment is appropriate. |
| Bladder or bowel changes, saddle numbness or rapidly worsening weakness are present | Seek urgent medical attention rather than waiting for a routine clinic appointment. |
Different healthcare professionals may work together during recovery. Seeing a pain specialist does not automatically mean that a procedure will be recommended.
What Are The Treatment Options For Sciatica in Singapore?
Treatment depends on the source and severity of the symptoms. Mild to moderate cases usually begin with non-invasive care.
Conservative Treatments
For mild to moderate sciatica, non-invasive approaches are the appropriate starting point:
Medication
Anti-inflammatory medication, muscle relaxants, neuropathic pain medication and, in selected cases, antidepressants may be used to manage pain and support nerve recovery.
Physiotherapy and Rehabilitation
A structured physiotherapy programme may strengthen the deep stabilising muscles of the lower back and pelvis, improve posture, restore mobility and reduce mechanical load on the affected nerve.
Activity Modification
Avoiding prolonged sitting, using suitable lifting mechanics and adding low-impact movement such as walking or swimming may help reduce nerve irritation during recovery.
Minimally Invasive Procedures
When sciatica persists despite conservative care, or when nerve compression is confirmed through assessment, a minimally invasive procedure may be considered to target the source of pain.
When an injection is suitable, its planning and delivery are guided by the Painostic® Injection Roadmap and Injection Technique.
Coreflex Injections
A precision-guided injection combining local anaesthetic, anti-inflammatory medication and a muscle relaxant is delivered to the area of nerve irritation or a muscle trigger point to reduce inflammation and promote healing.[→ Learn more about Coreflex Injection]
Disc Ablation
Disc ablation A fine needle-based radiofrequency procedure reduces the volume of a herniated disc component pressing on the sciatic nerve root. It is performed under image guidance.
Neuroplasty
A catheter-based procedure addresses adhesions around an affected nerve root and delivers anti-inflammatory medication to the area of entrapment. It may be considered for long-standing or recurrent sciatica related to spinal stenosis or post-surgical scarring. [→ Learn more about neuroplasty]
Surgical Options
Surgery for sciatica is rarely the first choice. . It may be considered when a structural cause has not responded to non-surgical treatment or when there is progressive neurological deterioration. Detailed imaging is reviewed before a surgical recommendation is made.
- Microdiscectomy: removes disc fragments pressing on a nerve root through a small incision
- Laminectomy: removes part of the lamina to widen the spinal canal and relieve nerve pressure; it may be combined with spinal fusion when instability is present
Clinical Case: Persistent Sciatica from an L5-S1 Disc Herniation
A patient in her 40s had recurring lower-back and left-leg pain for several years. Over time, the pain became more constant and was accompanied by numbness extending down the leg. She had previously undergone spinal surgery, but her symptoms later returned.
Updated imaging showed an L5-S1 disc herniation affecting the adjacent nerve root. The assessment also identified adhesion around the nerve following her previous surgery. After reviewing her symptoms, examination and imaging, Dr Bernard Lee recommended a minimally invasive approach to address both the disc and the nerve adhesion, followed by rehabilitation.
The patient reported improvement following treatment, although some numbness remained and continued rehabilitation was required. This is one individual case. Treatment suitability and outcomes vary according to the diagnosis, severity and individual response.
Source: Singapore Paincare clinical case. Patient details have been limited to protect privacy.
Read the full clinical case study →
Can Sciatica Be Prevented?
Some causes, such as age-related disc changes, cannot be fully prevented. The following habits may help protect the lower back and sciatic nerve:
- Maintain good posture while sitting, particularly during extended desk work
- Strengthen the core muscles regularly to support the lower back
- Keep active with low-impact exercise such as walking, swimming or yoga
- Maintain a healthy weight to reduce spinal load
- Use suitable lifting technique by bending at the knees and keeping the load close
- Avoid prolonged sitting without breaks; stand and move every 30 to 45 minutes
- Quit smoking, which can impair disc nutrition and accelerate degeneration
Dr Bernard Lee’s Media Insights on Sciatica
Dr Bernard Lee has discussed sciatica across Singapore media, including how symptoms develop, why they may affect adults of different ages and why the source of nerve-related pain should be identified before treatment is considered.
The Straits Times: Sciatica Among Younger Adults
In The Straits Times, Dr Lee discussed sciatica among younger working adults and the possible contribution of prolonged sitting, physical strain and sudden changes in activity.
LOVE 972: Sciatica Is More Than Back Pain
In this LOVE 972 discussion, Dr Lee explained why sciatica can cause pain, tingling or numbness that travels from the lower back into the leg. He also discussed risk factors, warning signs and when further assessment may be appropriate.
Mediacorp Silver Carnival: Understanding Sciatica
During Mediacorp’s Silver Carnival, Dr Lee discussed common sciatica symptoms, possible causes, assessment and the role of suitable activity in supporting back health.
Frequently Asked Questions
Medical References
The following sources support the general medical information presented on this page:
Last Updated 2 Sept 2026
