Interventional pain procedures explained

Purpose and expectations

Interventional pain procedures use an injection, implanted device, or targeted energy to affect pain pathways or deliver medication. They differ in purpose, duration, risks, and evidence for particular conditions. A procedure may be one part of broader care rather than a cure or a replacement for other supports.

Potential benefits and harms depend on diagnosis, the specific procedure, health history, and clinician assessment. Minimally invasive does not mean risk-free. Some procedures have condition-specific or limited evidence, and outcomes vary. A specialist can explain what is known for the proposed procedure, why it is being considered, and what uncertainty remains.

Nerve blocks and injections

A nerve block places local anaesthetic, sometimes with another medicine, near a nerve or group of nerves. It may help investigate a possible pain source, provide temporary relief, or support another treatment. The expected duration and value depend on the type and reason for the block. A response to a diagnostic block does not necessarily predict lasting benefit from a different treatment.

Injections can target joints, soft tissues, or areas around spinal nerves. The injected substance and target vary. Potential concerns may include temporary soreness, bleeding, infection, medication effects, or injury to nearby structures. Ask about the precise target, substance, image guidance, expected time course, and alternatives.

Radiofrequency ablation

Radiofrequency procedures use energy to heat a small area of tissue, often near selected nerves, with the aim of interrupting pain signals for a period of time. It is different from a nerve block, although a diagnostic block may form part of evaluation in some care pathways. Nerves may recover, so relief can be temporary and repeat procedures may be considered in some circumstances.

Possible effects include soreness or altered sensation after the procedure. The potential outcome depends on the target and underlying condition. Ask what result would count as meaningful, how long benefit might last, how complications are monitored, and what happens if it does not help. The procedure does not remove every underlying cause of pain.

Pain pumps and spinal cord stimulators

An implanted medication pump delivers medicine through a catheter into a selected area, often using a reservoir under the skin. It involves surgery and ongoing device management, including refills and monitoring. Risks can include infection, device or catheter problems, medication effects, and surgical complications. Details depend on the device and medicine.

A spinal cord stimulator uses implanted leads and a pulse generator to deliver electrical stimulation intended to alter pain signalling. Systems differ, and some include a trial before permanent implantation. A trial does not guarantee lasting benefit. Infection, lead movement, equipment problems, follow-up, or revision are considerations to discuss. These devices require continuing specialist care.

Informed discussion

Before agreeing to an intervention, ask the treating team to explain its goal, expected benefit and uncertainty, risks, alternatives, and what happens if it is not done. Clarify whether it is diagnostic, temporary, or intended as longer-term management. Discuss how it fits with other care and what follow-up involves.

Questions may include clinician experience, facility arrangements, recovery expectations, costs or coverage, and who to contact about concerns afterward. The decision should reflect individual health circumstances and preferences. This guide describes types of procedures and is not a recommendation for or against a specific intervention.

Pain care beyond procedures

Canadian public health information describes pain management plans as potentially including medication, medical devices, physical therapy, psychological and social support, pain procedures, and self-management strategies. Goals may include improving function and well-being as well as addressing pain. A procedure’s role is best understood within a broader plan developed with the person and care team.

Request information in plain language and take time to consider it where possible. A second opinion may be relevant for complex decisions. Follow procedure-specific instructions from the treating service and seek timely assessment for new or concerning symptoms.

Frequently asked questions

Sources

• Canada.ca: About chronic pain(opens in a new tab)
• Canadian Pain Task Force Report, 2019(opens in a new tab)
• Health Canada: Medical devices(opens in a new tab)

Written by the Chronic Pain Canada editorial team from the sources listed. Last updated October 2026.