Pain after surgery does not always come from a joint, tendon, or bone. Sometimes a healed incision remains sensitive, produces shooting pain when touched, or has an area of reduced sensation around it. Those symptoms raise a different question: could an injured or irritated nerve be contributing?

At Caring Medical, we discuss neural therapy as one approach to selected pain problems involving scars and other tissues. A demonstration by Demi Foster, APRN, shows local-anesthetic injections into two surgical scars in a young adult. The case provides a practical starting point for understanding the treatment, while also showing why a demonstration and a documented recovery are different things.

What is Huneke neural therapy?

Huneke neural therapy developed in Germany and uses local-anesthetic injections with the aim of influencing pain and nervous-system activity. Procaine and lidocaine are commonly discussed in the literature. Reported approaches include injections into skin, scars, trigger points, tissues near peripheral nerves, and selected autonomic structures. These are different procedures with different anatomical targets and risks. A broad review describes their use across several clinical conditions. (1)

The term does not mean that a nerve is being replaced or that every injection regenerates damaged nerves. Local anesthesia has an established ability to interrupt nerve-signal conduction temporarily. The stronger claim that an injection permanently corrects a distant illness requires separate evidence.

What are autonomic ganglia?

A ganglion is a collection of nerve-cell bodies outside the brain and spinal cord. Autonomic ganglia are relay structures within pathways involved in involuntary functions.

The somatic nervous system includes voluntary movement and sensory information from the body. The autonomic nervous system helps regulate heart rate, blood-vessel tone, sweating, pupil responses, and digestive activity. These systems interact, but the autonomic system does not independently control every bodily function. Vision, hearing, smell, and pain involve additional specialized sensory and central pathways.

This anatomy helps explain interest in nervous-system influences on pain. It does not establish that all chronic pain reflects an autonomic malfunction or that a skin scar is responsible for disease in an internal organ.

Why a surgical scar can hurt or feel numb

The visible scar may be only part of the problem. Surgery or trauma can injure small sensory nerves, and scar tissue may affect tissues below the skin. Symptoms can include burning, tingling, pain with light touch, or reduced sensation. Pain from a normally nonpainful touch is called allodynia. A review describes how painful scars can involve both structures within a nerve and surrounding tissues. (2)

Nerves normally move relative to nearby tissues as a limb moves. Scarring can sometimes tether a nerve and restrict that movement. Pain may therefore be provoked by pressure, clothing, footwear, or movement. A neuroma—disorganized nerve growth after an injury—is another possible explanation, but not every painful scar contains one. (3)

Pain and numbness are not opposites that exclude one another. Different parts of an injured region can have different sensory changes. Neither symptom, by itself, identifies the nerve involved or proves that a local-anesthetic injection will restore normal sensation.

Video: scar sensitivity and numbness after leg surgery

Demi Foster, APRN, demonstrates scar injections in a patient with persistent symptoms after lower-leg surgery. The following edited transcript summary describes the history and procedure presented in the video; it does not add an outcome that was not reported.

0:00–0:32: injury, surgery, and persistent symptoms

The patient is a man in his early 20s. At approximately age 18, he sustained a football-related lower-leg fracture. Demi describes surgical placement of a metal rod, followed later by its removal because pain persisted.

He has two surgical scars: one near the knee and another closer to the ankle. The video does not include operative reports or identify every structure affected by the injury or surgery.

0:33–0:47: two scars with different sensory complaints

Touching the lower scar triggers pain that shoots toward the bottom of his foot. Near the knee scar, he has lost some sensation.

This distinction is useful. One area is sensitive to contact; another has reduced sensation. The pattern raises questions about nerve involvement, but the video does not identify a specific injured nerve, document a neuroma, or provide a formal sensory examination.

0:48–1:39: local-anesthetic scar injections

Demi demonstrates placing local anesthetic into the scar region. She describes using an injection approach along the scar rather than multiple small skin injections, sometimes called blebs or wheals. This is the technique she presents for this patient, not a universal method or a recommended number of injections for everyone.

She explains the procedure using the terms “interference fields” and “resetting” nerves. These are concepts used in neural therapy. The demonstration does not show that a nerve has regenerated, that a scar adhesion has been permanently released, or that all symptoms originate from a single interference field.

1:40–2:18: radiating sensations and possible immediate relief

Demi discusses the possibility that an injection could reproduce sensations similar to those the patient experiences when the scar is touched. Such symptoms are part of the discussion, but the video does not establish their cause or justify assuming that every injection-related radiating sensation is harmless.

She also introduces the term lightning phenomenon, used in neural therapy for a rapid change in symptoms after an injection. The possibility of an immediate response is discussed; a measured immediate response is not documented for this patient.

2:19 onward: a pain problem distinct from joint instability

Demi concludes by distinguishing this scar-related presentation from chronic pain attributed to joint instability. That is an important clinical distinction. A painful scar, tendon injury, unstable joint, and incompletely healed fracture are different potential problems even when they occur in the same limb.

The video supplies no follow-up pain score, repeat sensation test, or longer-term result. It should therefore be understood as a treatment demonstration rather than evidence that his numbness resolved or his foot pain permanently disappeared.

What does “resetting a nerve” mean?

Local anesthetics block voltage-gated sodium channels involved in nerve conduction. This can temporarily reduce transmission of pain signals. Researchers have also studied effects on inflammation and sensitization, but these mechanisms should not be equated with proven repair of an injured human nerve. (1)

In neural therapy, “resetting” is shorthand for a proposed interruption of persistent abnormal signaling. It is not a measurement of nerve healing. Temporary numbness following an anesthetic injection is an expected pharmacological effect; it does not demonstrate restoration of sensation that was absent before treatment.

If improvement lasts longer than the expected anesthetic effect, that is worth documenting and studying. Duration alone, however, does not establish the mechanism or show that scar tissue was removed.

Does an injection break up scar tissue?

Fluid injection, tissue infiltration, mechanical separation around a nerve, and surgical scar release are not interchangeable. The video does not provide imaging or other measurements demonstrating that an adhesion was divided or nerve movement improved.

Describing an injection as “breaking up” a scar can therefore imply more than is demonstrated. The supported description here is local-anesthetic injection into the scar region, intended to help a scar-associated pain problem.

What are interference fields?

Within the Huneke framework, an interference field is a tissue site proposed to generate persistent abnormal input that influences symptoms locally or at a distance. Scars, previous injuries, and areas of inflammation have been discussed as possible sources. Historical explanations also focused on teeth, tonsils, and other head-and-neck sites.

A 2022 theoretical review proposes understanding these sites as neuromodulatory triggers and discusses sensitization and nervous-system connections that extend beyond simple anatomical segments. This is a mechanistic interpretation, not a clinical test proving that a particular scar causes a particular distant disease. (4)

A scar’s age or size alone does not establish that it is generating symptoms. Nor does a history of root-canal treatment, tonsillitis, or tonsillectomy prove an interference field. Dental infection and persistent throat problems require appropriate assessment on their own merits.

Why the heart-rhythm analogy has limits

Some explanations compare interruption of abnormal pain signaling with the use of lidocaine for selected cardiac arrhythmias. Both involve excitable tissues and sodium-channel effects, but different targets and conditions require different evidence. Lidocaine’s antiarrhythmic use does not demonstrate that scar injections correct generalized autonomic dysfunction.

What about symptoms beyond the scar?

Neural therapy has been discussed for headache, migraine, dizziness, fatigue, menstrual pain, and other complaints. Broader historical claims have included allergies, hay fever, asthma, sinus or tonsil problems, confusion, optic neuritis, liver disease, and chronic infection.

These conditions do not share one established scar-based cause. A general nervous-system role in pain or circulation does not establish that scar injections treat inflammatory eye disease, eliminate infection, or restore liver function. Each diagnosis requires its own evidence; treatment of a scar should not replace indicated medical or dental care.

What clinical research shows

A 280-patient chronic pain series

A 2015 case series followed 280 patients referred for refractory chronic pain, most commonly back pain. After one year, 126 reported considerable improvement and 41 were pain-free; 60 reported no change, and 52 reported slight improvement. Many participants who had used analgesics reported reducing or stopping them. (5)

The study had no control group. Its authors explicitly stated that the intervention’s specific contribution could not be determined. It was not a trial confined to painful surgical scars and does not establish a recovery rate for patients like the young man in the video.

A randomized study of acute muscle-related neck pain

A 2023 trial assigned 104 patients to kinesio taping, trigger-point injections, or neural therapy using lidocaine. Pain and disability improved in all three groups over the short follow-up, without significant between-group differences for those outcomes. Pressure-pain findings favored the injection approaches in some comparisons. (6)

This study concerns acute myofascial neck pain, not postoperative scar neuropathy. It cannot demonstrate that scar infiltration restores sensation or that neural therapy is superior to all other treatments.

A 2023 review of low-dose local-anesthetic treatments

A systematic scoping review mapped research across pain and other conditions and described encouraging findings. It also called for larger, well-designed randomized trials and long-term monitoring. A scoping review maps a broad literature; it does not establish equal effectiveness across every diagnosis and injection technique included. (1)

A 2024 study questioned a proposed interference-field examination

A randomized observer-blind study of 104 inpatients examined neck reflex points used in neural therapy. Agreement between examiners, and repeatability of their assessments, were low. Pressure-pain thresholds changed at several points after treatment, but the palpation method was not shown to be a reliable diagnostic tool under the study conditions. (7)

This illustrates why a change in tenderness and a reliable method of identifying a disease source are separate questions.

October 2026 laboratory research: cellular effects are not clinical recovery

A pilot laboratory study exposed cultured human fibroblasts and mouse muscle precursor cells to low concentrations of procaine. Effects differed by cell type: cellular energy levels decreased in the fibroblasts and increased in the muscle cells, with many changes returning toward baseline by 48 hours. (8)

This is early mechanistic research. It does not show improved scar pain, regenerated nerves, or restored sensation in people, and it should not be described as proof that procaine universally improves cellular energy.

Evidence specifically for painful scars

A painful-scar review described neural therapy as supported mainly by cases and anecdotal reports in the literature it assessed. The clinical and laboratory studies above do not close that scar-specific evidence gap. (2)

The most useful outcomes would include durable pain relief, improved tolerance of touch or footwear, function, and measured sensory change. Immediate numbing and longer-term recovery should be reported separately.

Neural therapy, Prolotherapy, and hydrodissection are different approaches

Our nerve release and hydrodissection page discusses the nerve-directed approach. Our Prolotherapy overview explains the musculoskeletal treatment separately.

Some patients may have more than one pain contributor. That does not mean that the procedures must always be combined or that treating joint instability will necessarily resolve scar sensitivity. The clinical question is which structure or process is contributing to which symptom.

Other explanations and treatments for persistent scar-region pain

A symptom pattern may prompt consideration of nerve injury, tethering, a neuroma, or a problem elsewhere along a nerve pathway. Persistent orthopedic pain may also involve the fracture site, joint, tendon, or hardware-related changes. The demonstration alone cannot distinguish all of these possibilities.

Clinical assessment may include sensory and strength testing, with ultrasound, nerve studies, or other imaging selected according to the suspected problem. A reduction in pain after local anesthetic can provide information, but it does not independently prove a distant interference field. (2)

Depending on the diagnosis, treatment discussions may include desensitization, rehabilitation, topical or other pain medicines, selected nerve procedures, or specialist surgical options. There is no single established best approach for every scar neuropathy. Surgical release also has limitations and can sometimes worsen symptoms. (3)

Understanding what a treatment demonstration can tell us

The young man’s case highlights a recognizable problem: a surgical scar can remain painful to touch, while another area nearby has reduced sensation. Demi demonstrates an injection approach intended to help those complaints and explains the neural-therapy framework behind it.

Medical disclaimer: This article provides general education and does not establish an individual diagnosis or treatment recommendation. Neural therapy’s broader interference-field mechanisms remain proposed explanations. A treatment demonstration does not establish effectiveness or predict another patient’s results. Persistent or progressive pain, numbness, or weakness requires appropriate medical assessment.

References

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