Key Summary:
A nerve block is a minimally invasive procedure in which medication is injected around a specific nerve or group of nerves to temporarily interrupt or reduce pain signals. Nerve blocks may be used to help identify the source of pain, provide temporary pain relief, or determine whether a patient may benefit from further targeted treatment. At Specialist Pain International Clinic in Singapore, led by Dr Nicholas Chua, nerve blocks may form part of a broader pain management plan for selected patients with persistent nerve, joint, spine, or other chronic pain conditions.
When pain persists despite medication, physiotherapy, or other conservative treatments, identifying exactly where the pain is coming from can sometimes be difficult. This is particularly true for nerve-related pain, where symptoms may travel from one part of the body to another.
A nerve block is a minimally invasive procedure that targets a specific nerve or group of nerves. Depending on the situation, it can be used both to help identify the source of pain and to provide temporary pain relief.
How Does a Nerve Block Work?
Nerves carry signals between the body and the brain, including pain signals. A nerve block involves injecting medication close to a particular nerve to temporarily reduce its ability to transmit these signals.
The injection commonly contains a local anaesthetic, which temporarily numbs the targeted nerve. In some cases, a corticosteroid may also be included to reduce inflammation around the nerve.
Nerve blocks can serve two main purposes:
Diagnostic nerve blocks help determine whether a particular nerve is responsible for the pain. If symptoms improve significantly after the injection, this provides useful information about the likely pain source.
Therapeutic nerve blocks aim to reduce pain for a period of time, potentially allowing the patient to move more comfortably and participate more effectively in rehabilitation.
What Conditions Can Nerve Blocks Be Used For?
Nerve blocks are used in different areas of pain medicine and may be considered for selected patients with:
- – Chronic back or neck pain
- – Sciatica and other nerve-related pain
- – Facet joint pain
- – Persistent knee pain
- – Head and facial pain
- – Certain types of chronic pelvic pain
- – Pain following injury or surgery
The type of block and nerve targeted depends on the location and suspected cause of the pain.
For example, a selective nerve root block may be used when a spinal nerve is suspected of causing pain that travels into an arm or leg. Other blocks target nerves supplying painful joints or specific regions of the body.
What Happens During a Nerve Block?
The exact procedure varies depending on which nerve is being targeted, but nerve blocks are generally performed as outpatient procedures.
Before the injection, the doctor reviews your symptoms, medical history, medications, and relevant scans. You may be positioned differently depending on the area being treated.
Imaging such as ultrasound, fluoroscopy (X-ray guidance), or CT may be used to guide the needle accurately towards the intended nerve while avoiding surrounding structures.
Once the needle is correctly positioned, the medication is injected around the nerve. The procedure itself is usually relatively brief, although monitoring may be required afterwards.
What Are the Benefits of a Nerve Block?
One of the main advantages of a nerve block is its ability to provide targeted information and treatment rather than treating pain throughout the body.
Potential benefits include:
- – Temporary reduction in pain
- – Helping identify which nerve is generating symptoms
- – Reducing inflammation around an irritated nerve
- – Improving movement and participation in physiotherapy
- – Helping guide decisions about further treatment
However, nerve blocks do not produce the same results for everyone. Relief may last hours, days, weeks, or longer depending on the type of block, medication used, and underlying condition.
A short period of relief can still be clinically useful when the primary purpose of the procedure is diagnostic.
Are Nerve Blocks Safe?
Nerve blocks are generally considered safe when performed by appropriately trained clinicians, but like all medical procedures, they carry potential risks.
These can include:
- – Temporary numbness or weakness
- – Bruising or soreness around the injection site
- – Bleeding
- – Infection
- – Allergic reaction to medication
- – Temporary worsening of pain
Nerve injury and other serious complications are uncommon but possible. Long-term nerve injury occurs in approximately 4 per 10,000 peripheral nerve blocks, with most neurological symptoms following these procedures were temporary.
The risks also differ according to the type and location of the block. Before the procedure, patients should inform their doctor about medications — particularly blood thinners — allergies, infections, pregnancy, and other relevant medical conditions.
What Should You Expect After a Nerve Block?
Some people notice pain relief soon after the procedure because of the local anaesthetic. Temporary numbness or weakness may also occur in the area supplied by the targeted nerve.
As the anaesthetic wears off, pain can return. If a steroid has been used, its effects may take several days to become apparent.
Patients are usually advised to avoid strenuous activity immediately afterwards and follow the specific post-procedure instructions provided by their doctor.
It can also be useful to keep track of how much the pain improves and how long the improvement lasts. This information can help determine whether the targeted nerve is likely to be contributing to the pain and what treatment should come next.
Is a Nerve Block a Permanent Treatment?
Usually, no.
A nerve block temporarily alters pain signalling rather than permanently destroying the nerve. Depending on the diagnosis, it may be one step within a broader treatment strategy involving medication, rehabilitation, lifestyle modification, or other minimally invasive procedures.
For certain chronic pain conditions, the response to a diagnostic nerve block may also help determine whether another treatment, such as radiofrequency ablation (RFA), could be appropriate.
Nerve Blocks at Specialist Pain International Clinic
Specialist Pain International Clinic (SPI) in Singapore, led by Dr Nicholas Chua at Mount Elizabeth Novena, assesses and manages a range of chronic and nerve-related pain conditions.
For selected patients, image-guided nerve blocks may be used to help identify the source of persistent pain or as part of a treatment plan. Depending on the diagnosis, this may be combined with medication, physiotherapy and rehabilitation, or other minimally invasive pain procedures.
If persistent pain has not improved despite previous treatment, an assessment can help determine whether a nerve is contributing to your symptoms and whether a targeted nerve block may be appropriate.
References
- https://www.ptcoa.com/the-role-of-nerve-blocks-in-diagnosing-and-treating-pain
- https://www.hopkinsmedicine.org/health/conditions-and-diseases/nerve-blocks
- https://www.ncbi.nlm.nih.gov/books/NBK459210/
- https://www.apsf.org/article/safety-considerations-in-peripheral-nerve-blocks/
- https://stanfordhealthcare.org/medical-treatments/p/peripheral-nerve-block/procedures/after-procedure.html
