Your MRI shows a bulge at L4-L5, another at L5-S1, and some narrowing on both sides. Each doctor seems to point at a different level. Meanwhile, the burning pain down your leg carries on, and now someone has suggested a “nerve root block”. You are left wondering which finding is actually causing the pain, and whether an injection into the spine is the right next step.
This guide explains what a selective nerve root block (SNRB) is, why it is used, what it can and cannot do, and how we at Dr Heal Pain Cure Hospital find the nerve that is really hurting and treat it without steroids.
Quick answer
- A selective nerve root block is an injection placed next to one single nerve root where it leaves the spine.
- It is usually advised for leg pain (sciatica) or arm pain from a pinched nerve.
- It is used to find the painful nerve (if the pain eases for a few hours, that nerve is likely the source) and often to calm it, commonly with a steroid.
- It does not repair a disc or correct what caused the nerve to be pinched.
- At Dr Heal, we pinpoint the painful nerve through detailed examination and MRI review, and any injection we give is a steroid-free regenerative injection.
Confused by your MRI, or advised a nerve block?
Bring your MRI films and report. Our pain specialists will match your symptoms to your scan, tell you which nerve is really involved, and explain a steroid-free, non-surgical plan. Open 24 hours.
Call 07969288086Book a consultationWhat is a selective nerve root block?
Nerve roots leave the spine through small openings on each side called foramina. Each root supplies its own strip of the leg or arm. When a disc bulge, bony spur or narrowing presses on a root at this opening, it becomes inflamed and sends pain, tingling or numbness along its path. Here is why the pain travels down your leg.
In a selective nerve root block, a fine needle is guided under X-ray to the outside of one opening, and medicine is placed around that single nerve root. In most centres this is a local anaesthetic, often combined with a steroid. The word selective matters: only one nerve is targeted, so the response tells the doctor about that nerve and no other.
Why doctors suggest it
MRI scans show changes in the spine very well, but they cannot show pain. Many adults have disc bulges that cause no symptoms at all. When more than one level looks abnormal, or the scan does not match the symptoms, a nerve root block is used to answer one question: which nerve is actually hurting? If the usual pain clearly eases for a few hours after the anaesthetic, that root is probably the source. It is also sometimes used before surgery to confirm the right level.
It is typically suggested for one-sided sciatica from a herniated disc, narrowing from a slipped vertebra, arm pain from a pinched nerve in the neck, or pain that continues after spine surgery.
Nerve root block or epidural?
| Selective nerve root block | Epidural steroid injection | |
|---|---|---|
| Target | One specific nerve root at its exit point | The epidural space, reaching several nerves |
| Main purpose | Finding the exact painful nerve, and calming it | Calming inflammation over a wider area |
| Usually suited to | One-sided pain, unclear MRI findings | Pain on both sides or across several levels |
| Usual medicine elsewhere | Local anaesthetic, often with steroid | Steroid with local anaesthetic |
Read our guide on what to know before you agree to an epidural steroid injection.
Limits and side effects worth knowing
- It does not repair anything. The block can quieten a nerve for a while, but the disc, joint or posture problem that pinched it is still there.
- Steroid effects. When a steroid is used, blood sugar and blood pressure can rise for a few days, and the number of injections in a year is limited. If you have diabetes, read back pain treatment for people with diabetes.
- Temporary numbness or weakness of the leg or arm for some hours, so you cannot drive home.
- Rare risks of any spinal injection: infection, bleeding, headache, and very rarely nerve injury or serious problems if medicine enters a blood vessel. Extra caution is needed in the neck.
- A block with no relief is still information: that nerve is probably not the main source, and the pain may come from another level, a facet or SI joint, or a muscle problem such as piriformis syndrome.
Questions to ask before a nerve root block
- Is this block to find the painful nerve, to treat it, or both?
- Which level do you suspect, and does my examination match my MRI?
- Will a steroid be used, and how will it affect my sugar or blood pressure?
- What is the plan after the block to stop the pain returning?
- Is there a way to treat this without steroids?
More help: questions to ask before spine surgery or injections, and what your MRI report really means.
How Dr Heal finds and treats the pinched nerve
At Dr Heal Pain Cure Hospital, our goal is to treat the cause and help you avoid surgery and its complications, with care that is kind to your body and your pocket. Our approach is built on regenerative medicine and functional medicine:
- Pinpointing the nerve. A detailed history and nerve examination (reflexes, strength, sensation and nerve stretch tests), read together with your MRI, tells us a great deal about which root is involved. Laboratory and radiology are available in-house.
- Steroid-free regenerative injections. When an injection is needed, we use our own regenerative medicine prepared through Dr Heal Pharma, with no steroids, no painkillers and no antibiotics. It aims to support healing around the irritated nerve rather than only suppress inflammation. Learn more about regenerative medicine.
- Functional medicine and nutrition to address weight, blood sugar, diet and other factors that keep inflammation going.
- Guided rehabilitation to take load off the nerve and strengthen the spine. Start with these gentle exercises for sciatica.
- Follow-up until you are moving freely, with honest advice if surgery is ever genuinely needed.
If you have relied on tablets for months, read why painkillers are not the long-term answer. If walking brings on the leg pain, see how to walk further with spinal canal stenosis. Our sciatica, disc bulge, spinal canal stenosis and neck pain treatment pages explain more.
When a pinched nerve needs urgent attention
Call us now on 07969288086. Our doctors are available 24 hours if you have:
- Weakness in the leg, foot, arm or hand that is getting worse
- Pain in both legs, or clumsy hands and unsteady walking
- Pain so severe that you cannot sleep, sit or walk
- Nerve pain with fever or unexplained weight loss
Medical emergency: if you lose control of your bladder or bowels, or feel numbness around the groin or buttocks, call us right away on 07969288086 (open 24 hours) for an urgent appointment.
Frequently asked questions
Does a nerve root block contain steroids?
In many centres it combines a local anaesthetic with a steroid. Ask your doctor exactly what will be used. At Dr Heal, any injection we give is steroid-free.
Is a nerve root block needed to find which nerve is pinched?
Not always. A careful examination read alongside your MRI often identifies the nerve. A block is one tool used when the picture remains unclear.
Will a nerve root block fix my disc problem?
No. It can quieten the nerve for a period, but lasting recovery needs treatment of the cause, along with rehabilitation and lifestyle changes.
I have diabetes. Should I worry about steroid injections?
Steroids can raise blood sugar for several days, so it is worth discussing with your doctor. Steroid-free treatment avoids this particular problem.
Can a pinched nerve heal without surgery?
For many people, yes. Most disc-related nerve pain settles with the right non-surgical care. Surgery is considered only for worsening weakness, warning signs or pain that stays disabling despite proper treatment.
Where can I get steroid-free treatment for a pinched nerve in Bengaluru?
Dr Heal Pain Cure Hospital treats sciatica, disc problems and pinched nerves without surgery or steroids at its HSR Layout and Banashankari branches. Both are open 24 hours. Call 07969288086 to book.
Find out which nerve is really causing your pain
Bring your MRI and reports. Our pain specialists will match your symptoms to your scan and explain a steroid-free, non-surgical plan in plain words. Open 24 hours at HSR Layout and Banashankari.
Call 07969288086Book an appointment