Interventional Pain Procedures — Injections, Blocks & Ablation

The Basics

What Are Interventional Pain Procedures?

Minimally invasive, image-guided procedures that use a thin needle to deliver medication to, or interrupt the nerves of, a specific pain generator — often the step between medication and surgery.

When back, neck, or nerve pain does not settle with time, therapy, and medication, the next step is often a targeted procedure rather than surgery. Using live X-ray (fluoroscopy) or ultrasound for guidance, a thin needle is placed precisely at the structure thought to be causing the pain — an inflamed nerve root, an arthritic joint, the small nerves that carry a joint’s pain, or a knotted muscle.

These procedures do two jobs. Some are diagnostic: numbing a specific structure to see whether that is truly where the pain comes from. Others are therapeutic: delivering anti-inflammatory medication, or using heat to quiet a nerve, to provide lasting relief. Often the two are combined, and a diagnostic result guides the next therapeutic step.

Most are quick outpatient procedures with little downtime. They can reduce pain, improve function, and help you get more from physical therapy — and for many people they postpone or avoid surgery altogether. Explore each one below to see what it targets and how it works.

At a Glance

Guidance: live X-ray or ultrasound

Setting: outpatient, minutes long

Two roles: diagnostic and therapeutic

Downtime: usually minimal

Goal: relieve pain, improve function

Often: a step before considering surgery

Targeted

Live imaging places the needle precisely at the suspected pain generator, sparing everything else.

Diagnostic

Numbing one structure can confirm whether it is truly the source of your pain, guiding what comes next.

Therapeutic

Anti-inflammatory medication or a precise heat lesion can provide weeks to many months of relief.

Function-Focused

Less pain means more progress in physical therapy, which is where lasting improvement comes from.

Interactive Tool

Explore Each Procedure

Select a procedure to see what it targets on the spine, how it works, whether it is used to diagnose or to treat, and how long relief typically lasts.

This schematic is a simplified educational illustration of where each procedure is aimed, not a depiction of your own anatomy.

Where They Fit

The Pain-Care Pathway

Interventional procedures sit in the middle of a stepped approach: more than medication, less than surgery, and often the tool that keeps surgery off the table.

Step 1

Conservative Care

Activity changes, physical therapy, and medication. Most pain improves here, and it is the foundation for everything that follows.

Step 2

Diagnostic Injection

When the source is unclear, numbing a specific structure (for example a facet joint via a medial branch block) confirms where the pain comes from.

Step 3

Therapeutic Procedure

A steroid injection, radiofrequency ablation, or trigger point injection is chosen based on the diagnosis to deliver lasting relief.

Step 4

Surgery, If Needed

If a structural problem needs correcting and less-invasive steps have not worked, surgery is considered — now with a clearer target.

What to Expect

The Procedure and Recovery

These are quick, outpatient procedures. Knowing the rhythm of the day and the honest trade-offs helps you plan.

Outpatient

Quick & Same-Day

Most take minutes and are done awake with local numbing, sometimes light sedation. You go home the same day.

Days–Months

Duration of Relief

Varies by procedure: a steroid injection may last weeks to months; a radiofrequency ablation often lasts 6 to 12 months.

Repeatable

Can Be Repeated

Many procedures can be repeated when they help. Steroid injections are spaced out over a year to limit steroid exposure.

Risks and Honest Trade-offs

These procedures are generally very safe, but no needle procedure is risk-free. Common, minor effects include temporary soreness at the injection site and a short-lived flare of pain before relief sets in. Steroid injections can briefly raise blood sugar (relevant if you have diabetes), cause flushing or sleeplessness for a few days, and are limited in how often they are given because repeated steroid can affect bone and other tissues over time. Less common risks include bleeding, infection, an allergic reaction, or a temporary headache if the covering around the nerves is entered.

It is also important to be realistic: interventional procedures manage pain and support function; they do not repair a structural problem such as an unstable slip or a large compressive lesion. A procedure that gives only brief relief is still useful information — it helps your team decide what will, and will not, address the underlying cause.

Frequently Asked Questions

Common Questions

Do these injections hurt?

The skin is numbed first, so most people feel pressure more than sharp pain. There can be a brief ache as the medication goes in, and some procedures cause a short flare of your usual pain over the next day or two before relief begins. The procedures are quick, and you are awake and able to talk with the team, sometimes with light sedation for comfort.

What is the difference between a nerve block and an ablation?

A block uses local anesthetic to temporarily numb a nerve. As a diagnostic test, a medial branch block tells us whether the small nerves to a facet joint are carrying your pain: if numbing them relieves your pain, that joint is likely the source. Radiofrequency ablation is the treatment that follows a positive block: it uses controlled heat to interrupt those same small nerves, giving much longer relief (often 6 to 12 months) until the nerves slowly regrow.

How long will the relief last?

It depends on the procedure and the problem. A diagnostic block lasts only hours. A therapeutic steroid injection may relieve pain for a few weeks to several months. Radiofrequency ablation typically lasts 6 to 12 months, sometimes longer, and can be repeated when the nerves regrow. Some people get lasting benefit because the window of relief lets them make progress in physical therapy.

Are steroids safe? How often can I have them?

The steroid used is an anti-inflammatory placed at the pain source, not the kind that builds muscle. It is generally safe, but repeated doses over time can affect bone and other tissues and can briefly raise blood sugar, so injections are spaced out (commonly no more than a few per year). Your team weighs the benefit of each injection against these limits and your other health conditions.

Will a procedure fix the underlying problem?

Usually not by itself. These procedures manage pain and improve function; they do not repair a structural cause such as an unstable slip, a large disc fragment, or significant instability. That is not a failure: a procedure that helps, even briefly, gives useful information about where the pain is coming from and what more definitive treatment might help.

What should I do after the procedure?

Most people rest for the remainder of the day and resume normal activity the next day. You may be asked to keep a pain diary for the first hours to days, which is especially important after a diagnostic block, since how much and how long your pain improves is the actual result of the test. Your team will give specific instructions about activity, driving, and any medications.

Our Team

Who We Are

This educational resource was developed by Brown Neurosurgery to help patients and families understand interventional pain procedures. Our neurosurgeons work closely with pain management, physiatry, and physical therapy so that each procedure is chosen for the right reason, at the right time, in a stepped plan built around you.

Keith-Austin Scarfo, DO, MS

Medical Director, Norman Prince Spine Institute

Interventional spine and pain procedures; Chair of Pain and Opioid Stewardship; Director of the Intrathecal Pump Program.

Alexios G. Carayannopoulos, DO, MPH

Chief, Physical Medicine & Rehabilitation

National leader in interventional spine and pain medicine; board certified in PM&R and pain medicine.

Laert Rusha, MD

Assistant Professor of Neurosurgery

Spine neurosurgery and the evaluation of spinal pain, coordinating procedural and surgical care.

Justin Y. Li, MD

Assistant Professor of Neurosurgery

Spine neurosurgery; identifying the pain source and when a procedure or surgery is the right step.