Neuromas – When Nerves Heal Improperly After Injury

What Are Neuromas?

Our entire body is interwoven with a dense network of nerves. These originate from the central nervous system – the brain and spinal cord – and transmit information to muscles, skin, and internal organs. They can be thought of as delicate, branched cables that send and receive signals.

When one of these “information cables” is injured – for example by a deep cut, a crushing injury, or during surgery – the body attempts to repair the damage. If this healing process is disorganized, individual nerve fibers may form a so-called neuroma: a nerve knot in which the original structure is not restored.

Abstract representation of a neuroma as a metaphor for disordered nerve signaling. — Abstract illustration of a neuroma: The nerve knot symbolizes uncontrolled signal transmission and pain.

Not every neuroma causes symptoms. In many cases, it remains unnoticed. If there are no signs like shooting pain or abnormal sensations, there is usually no need for immediate intervention.

When a Neuroma Causes Symptoms

In symptomatic neuromas, the nerve fibers are misdirected or overactive, leading to unpleasant signals. In this case, the nerve itself becomes “ill.” It can produce short circuits that cause even light touch to be perceived as severe pain. In some cases, patients experience sudden stabbing pain or persistent abnormal sensations, even in the absence of an external trigger.

Schematic illustration of a thickened nerve with a knot and lightning symbol indicating a painful. — A painful neuroma can form when nerve fibers grow back disorganized after injury. The lightning symbol represents the typical shooting pain.

These misfiring signals do not originate from the skin or muscle but arise within the damaged nerve tissue itself. The brain interprets these signals as pain – even though no acute injury is present.

Cartoon-style nerve cell with startled expression and small pain signs from contact with a feather – representing allodynia — When even touch causes pain. Allodynia means that normally harmless stimuli like gentle contact are perceived as painful.

Commonly Affected Areas

Symptomatic neuromas can develop wherever nerves have been injured. Small sensory nerves are particularly often affected:

Hands and fingers – for example after lacerations from glass shards or sharp tools
Forearms – such as after crush injuries or fractures
Feet and lower legs – following cuts or blunt trauma
Front of the thigh – for example after groin surgery or other operations

Even small injuries can lead to a neuroma. The size of the wound is less important than the type of nerve damage and how the healing process progresses.

How Is a Neuroma Diagnosed?

Diagnosis is based primarily on clinical examination. Imaging techniques such as high-resolution nerve ultrasound – especially when combined with sonopalpation (applying targeted pressure to the suspected neuroma under ultrasound guidance) – can provide valuable information.

Medical illustration of a clinical examination for nerve pain. — A clinical examination provides key information for identifying a symptomatic neuroma.

This combination allows even small cutaneous nerves to be visualized and assessed with relative accuracy. It is crucial to distinguish between a neuroma that is merely an incidental finding and one that is truly linked to the symptoms. Sonopalpation can help identify hypersensitivity of the affected nerve.

Cartoon-style illustration of a relaxed nerve cell lying on an examination table, gently sonopalpated with an ultrasound probe. — Ultrasound visualises tissue precisely while gentle palpation provides extra information

In some cases, additional neurophysiological testing may be performed – especially for larger nerves. These tests check whether the nerve still conducts signals or whether there is a complete interruption. However, small cutaneous nerves often branch extensively and are not reliably measurable using these techniques. Accordingly, such tests are not part of the official diagnostic criteria for symptomatic neuromas.

A recent consensus paper (Diagnostic Criteria for Symptomatic Neuroma, Arnold et al., 2021) defines symptomatic neuromas based on clinical features such as stabbing pain or pressure sensitivity at the scar site and imaging – not based on conduction studies of major nerves.

How Can Symptoms Be Treated?

Before considering surgical options, treatment usually follows a stepwise, interdisciplinary approach. In many cases, symptoms can be alleviated using non-surgical measures, such as:

Medication, including pain-modulating drugs or localized pain relief with medicated patches
Physiotherapy to relieve surrounding structures and prevent postural strain
Occupational therapy, for example to help with pain management, desensitization, functional exercises, or custom splints that protect or support affected areas
Physical nerve modulation methods, such as transcutaneous electrical nerve stimulation (TENS) or targeted cold/heat applications
Targeted infiltrations under ultrasound guidance, both for diagnostic purposes and temporary symptom relief
Adjustments to daily activities and load, to reduce irritation of sensitive areas

In selected cases – following thorough evaluation and interdisciplinary assessment – the use of implantable pain electrodes (peripheral nerve stimulation) may be considered. This is primarily reserved for severe, therapy-resistant neuropathic pain and is only carried out in specialized centers.

The aim is to create a personalized treatment plan that considers the nature, intensity, and progression of the symptoms. Depending on the situation, involving different medical specialties may be helpful – for accurate diagnosis, pain assessment, or supportive therapy.

Schematic illustration of a personalized treatment plan with a central symbol surrounded by medical options. — Every treatment plan should be tailored to the symptoms and needs of the individual.

Current evidence suggests a more cautious approach toward direct surgical interventions on nerve tissue, especially when the long-term course is still unclear.

Summary

Neuromas form when injured nerves do not heal in an orderly manner.
Many neuromas are asymptomatic and require no intervention.
Symptomatic neuromas can cause severe, sometimes electric-like pain.
Arms, legs, hands, and feet are frequently affected after trauma.
Diagnosis relies on clinical signs, ultrasound, sonopalpation, and sometimes further testing.
Treatment is usually gradual and individualized – surgery is rarely the first option.

Disclaimer: The information provided on this page is for general informational purposes only and does not constitute medical advice. It is not a substitute for personal consultation, examination, or treatment by a physician or other qualified healthcare professional. No guarantees of healing or cure are made. While we strive for accuracy and completeness, we cannot guarantee that all content is up to date or free from errors, and we accept no liability for any inaccuracies.