Peripheral Nerve Stimulation for Chronic Pain: What Patients Need to Know

Can peripheral nerve stimulation help chronic pain?

Yes. Peripheral nerve stimulation (PNS) may help people living with chronic pain that has not improved with treatments such as physical therapy, medications, injections, or surgery. 

PNS is most often used for chronic nerve pain that has lasted for months or years. 

What Is Peripheral Nerve Stimulation (PNS)?

Peripheral nerve stimulation (PNS) is a treatment that uses mild electrical stimulation to calm nerves that continue sending pain signals long after an injury has healed. It is a type of neuromodulation, meaning it changes how the nervous system processes pain.

To understand how PNS works, it helps to understand what happens when a nerve is injured.

Imagine you sprain your ankle. Inflammation and tissue damage trigger pain signals that travel through nearby nerves to the spinal cord and brain. As the injury heals, those signals usually fade away.

Sometimes, however, the nerve itself becomes part of the problem. Even after the original injury has healed, an injured nerve may continue sending pain signals for months or even years. Over time, the entire pain pathway—from the nerve to the spinal cord to the brain—can become increasingly efficient at producing pain.

Peripheral nerve stimulation is designed to interrupt that cycle. By delivering gentle electrical stimulation near the affected nerve, PNS can help reduce abnormal pain signaling and change how pain messages are processed by the nervous system.

How Does Peripheral Nerve Stimulation Work for Chronic Pain?

Peripheral nerve stimulation works by placing a thin wire near an injured or irritated nerve that is continuing to send pain signals.

The device delivers gentle electrical stimulation to the nerve. During treatment, you may feel a mild buzzing, tingling, or vibration sensation near the affected area. Rather than simply blocking pain, the stimulation changes how pain signals are processed by the nervous system.

Researchers believe that repeatedly stimulating an injured nerve may help change pain pathways and support the body's natural pain-control systems. 

What Types of Pain Can Peripheral Nerve Stimulation Treat?

Peripheral nerve stimulation is most often used for chronic nerve pain that can be linked to one or two specific nerves. 

Examples of conditions that may be treated with peripheral nerve stimulation include:

• Chronic pain after knee replacement surgery
• Chronic pain after shoulder surgery
• Chronic pain after hip surgery
• Carpal tunnel syndrome
• Cubital tunnel syndrome
• Tarsal tunnel syndrome
• Shingles-related nerve pain
• Complex regional pain syndrome (CRPS)
• Post-surgical nerve injuries
• Nerve pain caused by trauma

In general, peripheral nerve stimulation works best for pain that follows a specific nerve pathway, such as pain, tingling, burning, or numbness in a particular part of the body. It is typically less effective for widespread pain that affects multiple areas at the same time.

Can Peripheral Nerve Stimulation Help Pain After Surgery?

Yes.

Many people who are referred for peripheral nerve stimulation developed chronic nerve pain after surgery. Common examples include knee replacement surgery, shoulder surgery, and hip surgery.

In some cases, the surgery itself was successful and imaging studies look normal. Even so, pain may continue for months or years afterward. This can happen when a nearby nerve becomes injured, irritated, or overly sensitive during the healing process.

By calming abnormal nerve activity, the treatment may help reduce ongoing pain and improve function in some patients.

What Is the Difference Between PNS and a TENS Unit?

You may wonder whether peripheral nerve stimulation (PNS) is simply a more advanced version of a TENS unit. While both treatments use electrical stimulation, they work in different ways.

A TENS unit delivers electrical stimulation through pads placed on your skin. Because the signal has to travel through the skin and underlying tissues, higher levels of stimulation are often needed.

With peripheral nerve stimulation, a thin wire is placed near the affected nerve. This allows electrical stimulation to be delivered directly to the nerve involved in your pain rather than through the skin.

Another important difference is how the stimulation reaches the muscles. With a TENS unit, electrical stimulation can directly activate muscles and cause them to contract. With PNS, the stimulation travels through the nerve first, allowing the muscle to contract through the body's natural nerve pathway. In this way, PNS more closely mimics how the nervous system normally communicates with muscles.

Because the stimulation is delivered next to the nerve, lower levels of electrical current can often be used. The treatment is also more precise, focusing on the specific nerve that may be contributing to your pain rather than a broader area of the body. Researchers believe these effects may help support longer-term changes in how pain is processed by the nervous system.

Who Is a Good Candidate for Peripheral Nerve Stimulation?

Peripheral nerve stimulation may be an option if you have chronic nerve pain that has not improved with other treatments.

Many people who are considered for PNS have already tried treatments such as:

• Physical therapy
• Pain medications
• Steroid injections
• Nerve blocks

However, PNS is not always a last resort. In some cases, it may be considered earlier, particularly if you want to avoid long-term medication use or if medications are causing unwanted side effects.

In general, the best candidates have nerve pain that has lasted for at least six months and can be traced to a specific nerve. A pain specialist can help determine whether your symptoms and pain pattern are a good match for peripheral nerve stimulation.

What Happens During a Peripheral Nerve Stimulation Evaluation?

If you are being evaluated for peripheral nerve stimulation, the first step is usually a consultation and physical examination. During this visit, your doctor will ask about your symptoms, review any previous treatments, and look for clues that your pain may be coming from a specific nerve.

If a particular nerve appears to be responsible for your pain, the next step is often an ultrasound-guided nerve block. During this procedure, a small amount of numbing medication is placed around the suspected nerve.

The goal is to answer an important question: Is this the nerve causing your pain?

If your pain improves temporarily after the nerve block, it helps confirm that the correct nerve has been identified. The results of a nerve block are always temporary, and the pain typically returns when the medication wears off. This does not mean the nerve block failed. Think of the nerve block as a "pain X-ray" that temporarily helps identify the source of your pain and guide treatment decisions.

If you are a candidate for a peripheral nerve stimulator, you will also meet with a pain psychologist. This evaluation is a routine part of the process and helps ensure you understand what to expect from treatment, including its potential benefits and limitations.

How Is a Peripheral Nerve Stimulator Implanted?

Peripheral nerve stimulation is typically performed as an outpatient procedure, which means you can go home the same day.

The procedure is minimally invasive and is usually performed using a small needle rather than a large incision. Temporary systems can often be placed in just a few minutes, while permanent systems generally take less than an hour. To help keep you comfortable, you may receive antibiotics and light sedation. General anesthesia is not usually necessary.

During the procedure, your doctor uses imaging guidance to place a thin wire near the nerve believed to be causing your pain. 

Most people are able to return home shortly after the procedure and resume many of their normal activities within a short period of time.

What Is Recovery Like After Peripheral Nerve Stimulation?

Recovery after peripheral nerve stimulation is usually straightforward. For the first week or so, your doctor will likely ask you to take it easy and avoid activities that could pull on or dislodge the wire while the area heals. Most people are able to move around and perform their usual daily activities, but strenuous exercise and heavy lifting may need to wait until your doctor says it is safe.

You can typically shower during recovery, although you may be asked to avoid soaking in a bath, hot tub, pool, or lake for a period of time.

After the first one to two weeks, most people can gradually return to their normal routines without restrictions. 

Is Peripheral Nerve Stimulation Safe?

Peripheral nerve stimulation is generally considered a low-risk procedure.

Potential risks include:

• Infection
• Minor bleeding
• Wire movement (migration)
• Wire breakage
• Need for revision or replacement

Because the procedure does not involve placing hardware near the spinal cord, it may be an option for some patients who are not candidates for spinal cord stimulation.

Does Peripheral Nerve Stimulation Really Work?

Yes. Research suggests that peripheral nerve stimulation can provide meaningful pain relief for many people with chronic nerve pain.

Studies have found that roughly 70% to 80% of patients experience significant improvement after treatment. It's important to understand that success does not always mean pain disappears completely. For many people, success means having less pain, being able to do more of the activities they enjoy, sleeping better, or improving their quality of life.

While results vary from person to person, many patients experience meaningful improvements in pain, physical function, and day-to-day activities after treatment.

How Long Does Pain Relief From PNS Last?

The answer depends on the type of device used and how your body responds to treatment.

Temporary peripheral nerve stimulators are often used for about 60 days. Research suggests that many people who experience meaningful pain relief during that time continue to benefit long after the device has been removed. In some studies, improvements have lasted for a year or more after treatment.

Not everyone has the same experience. Some people may need a permanent system that provides ongoing stimulation, while others continue to improve even after treatment ends.

One of the unique aspects of peripheral nerve stimulation is that its effects may outlast the treatment itself. 

Does Insurance Cover Peripheral Nerve Stimulation?

In many cases, yes. Medicare commonly covers peripheral nerve stimulation, and many commercial insurance plans also provide coverage. However, some insurance companies may require prior authorization or additional documentation before approving treatment.

Because coverage policies vary, it's important to check with your insurance provider and healthcare team before moving forward. They can help you understand what is covered, whether authorization is needed, and what out-of-pocket costs you may be responsible for.

Frequently Asked Questions About Peripheral Nerve Stimulation

Is peripheral nerve stimulation permanent?

Not always. Some systems are temporary and remain in place for about two months. Others are designed for long-term use.

Will I feel the stimulation?

Most patients describe the sensation as a mild buzzing, vibration, or tingling rather than pain.

Can the device be removed?

Yes. Temporary systems are removed in the clinic. Permanent systems can also be removed if necessary.

Is peripheral nerve stimulation a cure for chronic pain?

PNS is not considered a cure. However, it can significantly reduce pain and improve function for many patients.