Neuralgia is a condition that causes sharp, stabbing, or burning pain along the path of an irritated or damaged nerve anywhere in the body. This pain can be sudden, severe, and sometimes debilitating, affecting everyday activities like eating, brushing teeth, or even smiling.
Understanding Neuralgia and Its Impact
Neuralgia describes nerve pain that occurs when a nerve becomes irritated or damaged. This damage can happen anywhere in the body and results in distinct, often severe pain that follows the path of the affected nerve. The term comes from “neural,” referring to nerves, and “algia,” meaning pain. Unlike other types of pain, nerve pain has unique characteristics that make it particularly challenging to live with[1].
The condition is not an illness by itself but rather a symptom of an underlying problem affecting the nerve. While almost everyone experiences mild neuralgia at some point in their lives, these episodes are usually temporary and resolve within a few days. However, some forms of neuralgia are longer lasting and can be so severe that they significantly reduce a person’s quality of life[2].
The pain from neuralgia is distinctive. It may feel like a shooting or stabbing sensation, an electric shock, or a burning feeling. Some people describe it as pins and needles or tingling. The affected area often becomes extremely sensitive to touch, so that even light pressure or gentle contact can trigger intense pain. The pain typically comes and goes in episodes, though some people experience constant discomfort[4].
Epidemiology
Older people are most susceptible to neuralgia, though the condition can affect people of any age. The demographics and incidence vary depending on the specific type of neuralgia[2].
Trigeminal neuralgia, one of the most common forms affecting the face, occurs in about four to five new patients per 100,000 people each year. The highest incidence occurs between the ages of 50 and 70, with about 90 percent of cases beginning after age 40. Women are more commonly affected than men, with a ratio of approximately 1.5 to 1. About 150,000 people in the United States receive a trigeminal neuralgia diagnosis every year. Most cases develop after age 50, and the condition very rarely affects children[7][13].
Postherpetic neuralgia, which occurs as a complication after shingles, affects about 10 to 18 percent of people who develop shingles, according to the Centers for Disease Control and Prevention. This makes it the most common complication of shingles[6].
Causes
Neuralgia develops when there is disruption to a nerve’s structure or function. The pain occurs because the nerve becomes irritated or damaged, and this can happen through several different mechanisms. Sometimes the cause is clear, but in many cases, the exact reason for nerve damage remains unknown[1][5].
Infections represent a significant cause of neuralgia. Shingles, caused by the reactivation of the chickenpox virus, is particularly notable. The virus that causes chickenpox remains dormant in the nervous system after recovery and can reactivate later in life, causing inflammation in nerve fibers. This inflammation can lead to permanent nerve damage that produces pain even after the infection has subsided. The likelihood of developing shingles increases with age. Other infections such as HIV/AIDS, Lyme disease, and syphilis can also damage nerves and cause neuralgia[1][5][6].
Physical pressure on nerves is another important cause. This pressure can come from various sources, including broken bones, slipped vertebral discs, or tumors pressing against a nerve. In the case of trigeminal neuralgia, the most common cause is a blood vessel, usually an artery, pressing on the trigeminal nerve near where it enters the brain stem. The pressure from these blood vessels can wear away the protective outer layer of the nerve, called the myelin sheath, which may cause pain signals to travel along the nerve[2][7][8].
Chronic medical conditions also contribute to neuralgia. Multiple sclerosis, a disease that causes inflammation and damages the protective covering around nerve fibers, can lead to trigeminal neuralgia and other forms of nerve pain. Diabetes can cause peripheral neuropathy, which is nerve damage affecting the peripheral nerves throughout the body. Chronic kidney disease affects nerve function and can result in neuralgia[1][5].
Certain medications, particularly chemotherapy drugs such as cisplatin, paclitaxel, and vincristine, can damage nerves and cause pain. Heavy alcohol use is another cause of nerve damage. Vitamin deficiencies, particularly of vitamin B12 and thiamine (vitamin B1), can also affect nerve health and lead to neuralgia. Trauma from injuries or surgical procedures, including dental surgery, can directly damage nerves[4][5].
Risk Factors
Several factors increase the likelihood of developing neuralgia. Age is one of the most significant risk factors, as older individuals are more susceptible to nerve damage and conditions that cause neuralgia. This increased risk with age is particularly evident in trigeminal neuralgia and postherpetic neuralgia[2][7].
Gender plays a role in some forms of neuralgia. Women are more likely than men to develop trigeminal neuralgia. For trigeminal neuralgia specifically, women over the age of 50 years are most commonly affected[2][7].
Having certain medical conditions significantly raises the risk. People with multiple sclerosis face an increased risk of developing trigeminal neuralgia because the disease damages the protective covering of nerves. Those with diabetes are at higher risk for peripheral neuropathy. Individuals with weakened immune systems, whether from HIV/AIDS or other causes, have greater susceptibility to infections that can damage nerves. Anyone who has had chickenpox is at risk for developing shingles later in life, which can lead to postherpetic neuralgia[1][5][6].
Lifestyle factors also contribute to risk. Heavy alcohol consumption can damage nerves over time. Poor nutrition, particularly deficiencies in B vitamins, affects nerve health. People undergoing chemotherapy treatment face increased risk due to the nerve-damaging effects of certain cancer drugs[4][5].
Previous trauma or surgery to an area can increase the likelihood of nerve damage in that region. Dental procedures, facial injuries, or other surgical interventions can sometimes result in nerve damage that leads to neuralgia[5].
Symptoms
The symptoms of neuralgia are distinctive and often severe. The hallmark symptom is pain that follows the path of the affected nerve. This pain has several characteristic features that distinguish it from other types of pain[1].
The pain is typically sudden and intense. People often describe it as shooting, stabbing, or feeling like an electric shock. The sensation can also be burning in nature. These episodes of pain can last from just a few seconds to several minutes. Some people experience constant aching or burning between acute episodes[1][3][6].
Dysesthesia, which means unusual skin sensations without a skin-related cause, is common in neuralgia. This might feel like tingling, pins and needles, or other strange sensations. Hyperesthesia, or hypersensitivity to touch and other sensations, makes the affected area extremely sensitive. Even light touch can become painful[1].
People with neuralgia often experience allodynia, which is pain from stimulation that would not normally cause pain. For example, a light breeze on the face, gentle brushing of the skin, or the touch of clothing can trigger intense pain. This makes everyday activities challenging. The area along the path of the damaged nerve may be excruciatingly sensitive to touch, and any pressure is felt as pain[1][2].
In trigeminal neuralgia, which affects the face, the pain usually occurs on one side only. It can affect the cheek, jaw, teeth, gums, lips, forehead, or around the eyes, depending on which branch of the trigeminal nerve is involved. The pain may be severe enough to cause involuntary muscle spasms in the face, which is why the condition is sometimes called “tic douloureux,” meaning “painful tic”[2][3].
Muscle problems can develop in people with neuralgia. The affected area may remain functional, but muscles can spasm. In some cases, prolonged reluctance to move a painful body part can lead to muscle atrophy, where muscles weaken and waste away from lack of use[1][2].
Some people experience weakness or even complete paralysis of muscles supplied by the affected nerve. There may be a loss of sweating in the affected area, since nerves control sweating. The pain is often worse at night, which can interfere with sleep and further impact quality of life[4][5].
The pattern of pain varies among individuals. Some people have irregular episodes that come on suddenly. These episodes can occur multiple times a day or may come and go over weeks or months. Others experience periods of remission where they have no pain, followed by periods when symptoms return. Still others have more constant pain with persistent aching and burning sensations[3][7].
Prevention
While it is not always possible to prevent neuralgia, certain measures may reduce the risk of developing nerve damage that leads to pain. Prevention strategies focus on maintaining overall nerve health and avoiding situations that can damage nerves[4].
Managing chronic health conditions is crucial for preventing nerve damage. People with diabetes should work to keep their blood sugar levels well controlled, as high blood sugar can damage nerves over time. Regular monitoring and following treatment plans for conditions like multiple sclerosis or other chronic diseases can help protect nerve health[4].
Nutritional support plays an important role in nerve health. Ensuring adequate intake of B vitamins, particularly vitamin B12 and thiamine (vitamin B1), helps maintain healthy nerve function. A balanced diet rich in nutrients supports the nervous system. People at risk for vitamin deficiencies should consider supplementation under medical guidance[4][5].
Limiting alcohol consumption helps protect nerves from damage. Heavy alcohol use is a known cause of nerve problems, so moderating alcohol intake or avoiding it altogether reduces this risk[4].
For postherpetic neuralgia specifically, vaccination against shingles can be an effective preventive measure. Since postherpetic neuralgia develops as a complication of shingles, preventing shingles through vaccination reduces the risk of this form of neuralgia. The shingles vaccine is typically recommended for older adults[6].
Protecting against infections that can damage nerves is important. This includes practicing safe behaviors to avoid sexually transmitted infections like HIV and syphilis, which can affect the nervous system. Prompt treatment of infections can prevent complications that might lead to nerve damage[2][5].
Managing stress may help reduce the frequency of pain episodes in people who already have neuralgia. While stress management may not prevent the initial development of the condition, it can be part of an overall approach to maintaining nerve health. Techniques such as deep breathing exercises, meditation, yoga, and other relaxation methods can support the nervous system[4].
Avoiding trauma when possible helps prevent nerve damage. This includes taking precautions to prevent falls and injuries, especially to the face and head. People undergoing surgical procedures should discuss with their healthcare providers any risks of nerve damage associated with the procedure[5].
Pathophysiology
Understanding how neuralgia develops at a physical and biochemical level helps explain why the pain is so distinctive and sometimes difficult to treat. The pathophysiology involves changes to the structure and function of nerves[1].
Normally, nerves are protected by a covering called the myelin sheath. This protective layer acts like insulation around electrical wiring, allowing nerve signals to travel quickly and efficiently. When a nerve is compressed or irritated, this protective covering can become damaged. The process of losing this protective covering is called demyelination[7][8].
Once the myelin sheath is damaged, the nerve becomes more sensitive and can malfunction. Normal nerve signals that would typically carry information about touch or temperature can be interpreted by the brain as pain signals. This is why people with neuralgia often experience pain from stimuli that should not be painful, such as a light touch or gentle breeze[8].
The damage to nerves causes abnormal depolarization, which means the nerve cells become electrically unstable. Instead of sending signals in a controlled, organized way, damaged nerves can send signals erratically. This leads to the development of ectopic impulses, which are abnormal electrical signals that originate at the site of nerve damage rather than from actual sensory stimulation. These ectopic impulses are experienced as spontaneous pain that comes without any clear trigger[13].
In trigeminal neuralgia, the most common mechanism involves compression of the trigeminal nerve near where it enters the brain stem, an area called the root entry zone. This compression is typically caused by a blood vessel, most often the superior cerebellar artery, pressing against the nerve. The constant pressure from the pulsating blood vessel gradually damages the nerve over time[7][8][13].
Recent research suggests that the pathophysiology may be more complex than just peripheral nerve damage. Studies indicate that people with some forms of neuralgia may have changes in how the central nervous system processes pain signals. There can be excessive activation of central facilitation of pain processing, meaning the brain and spinal cord become hypersensitive to pain signals. This central sensitization can cause symptoms to persist even after the initial cause of nerve damage has been addressed[1][13].
The inflammation that occurs with nerve damage also contributes to pain. When nerves are damaged by infections like shingles, the viral infection causes inflammation in the nerve fibers. This inflammatory process can lead to permanent changes in the nerve that continue to generate pain signals long after the infection has cleared[6].
Blood supply to nerves can also play a role. Poor circulation to nerves deprives them of oxygen and nutrients, which can cause damage and pain. This is particularly relevant in conditions like diabetes, where blood vessel disease is common[4].
The body’s response to nerve damage includes changes in how pain receptors function. Pain receptors can become more numerous and more sensitive in areas of nerve damage. The nervous system may also undergo changes in how it regulates pain signals, with normal inhibitory mechanisms that would usually dampen pain becoming less effective. These changes explain why neuralgia pain can be so intense and why ordinary pain medications often do not work well[1].
