What Is a Nerve Block and How Does It Relieve Chronic Pain?
April 6, 2026
Chronic pain affects millions of people and can interfere with nearly every aspect of daily life—from work and exercise to sleep and emotional well-being. When medications, physical therapy, or lifestyle changes aren’t enough to control pain, physicians may recommend an interventional treatment called a nerve block.
Nerve blocks are commonly used in pain management to diagnose the source of pain and provide meaningful relief for many chronic conditions. But what exactly is a nerve block, and how does it work?
Understanding How Pain Signals Work
Nerves act like communication pathways that carry signals between different parts of the body and the brain. When tissue is injured or inflamed, nearby nerves send pain signals through the spinal cord to the brain, where the sensation is interpreted as pain.
Sometimes these signals continue long after the original injury has healed, or they become exaggerated due to inflammation or nerve irritation. A nerve block works by interrupting the transmission of pain signals along specific nerves.
What Is a Nerve Block?
A nerve block is a minimally invasive procedure in which a physician injects medication near a specific nerve or group of nerves responsible for transmitting pain.
The injection typically contains:
- A local anesthetic to temporarily numb the nerve
- A corticosteroid to reduce inflammation
- Sometimes additional medications to prolong pain relief
The goal is to stop or reduce the nerve’s ability to send pain signals to the brain.
Types of Nerve Blocks Used for Chronic Pain
Facet Joint Nerve Blocks
Facet joints are small joints in the spine that allow for movement and flexibility. Arthritis or degeneration in these joints can cause chronic neck or back pain. Facet nerve blocks target the nerves that supply these joints to reduce inflammation and discomfort.
Epidural Nerve Blocks
Epidural injections are commonly used for spinal nerve conditions such as herniated discs, sciatica, spinal stenosis, and degenerative disc disease. Medication is injected into the epidural space around the spinal cord to calm irritated nerves.
Peripheral Nerve Blocks
Peripheral nerve blocks target nerves outside the spine and are often used for pain in the shoulders, hips, knees, or arms.
Sympathetic Nerve Blocks
These injections target the sympathetic nervous system and may be used to treat conditions such as complex regional pain syndrome (CRPS).
How Nerve Blocks Provide Pain Relief
Interrupting Pain Signals
The anesthetic temporarily stops nerves from transmitting pain signals to the brain.
Reducing Inflammation
Corticosteroids reduce swelling around irritated nerves, which can lead to longer-lasting relief.
Allowing the Body to Heal
When pain is reduced, patients can return to normal movement and physical therapy, which helps support recovery.
Identifying the Source of Pain
Nerve blocks are also used as diagnostic tools. If pain improves after the injection, physicians can confirm that the targeted nerve is the source of discomfort.
Conditions Commonly Treated with Nerve Blocks
- Chronic neck or back pain
- Sciatica
- Herniated discs
- Spinal arthritis
- Post-surgical nerve pain
- Migraines and severe headaches
- Complex regional pain syndrome (CRPS)
- Peripheral nerve injuries
What to Expect During the Procedure
Nerve block procedures are typically performed in an outpatient setting and take less than 30 minutes.
- The patient lies comfortably on a treatment table.
- The skin is cleaned and numbed.
- The physician uses imaging guidance to place a needle near the nerve.
- Medication is injected around the nerve.
Most patients can return home the same day after a short observation period.
How Long Does Relief Last?
Relief from a nerve block varies depending on the condition and patient. Some experience relief for a few hours or days, while others may benefit for several weeks or months. In some cases, a series of injections may be recommended.
Are Nerve Blocks Safe?
Nerve blocks are generally considered safe when performed by experienced physicians. Side effects are usually mild and temporary, such as soreness at the injection site or temporary numbness.
When to Consider a Nerve Block
If chronic pain continues despite conservative treatments, a nerve block may provide meaningful relief and help improve daily function. A pain management specialist can determine whether this treatment is appropriate based on the cause of your pain.
