Notalgia paresthetica is a nerve-related condition that causes persistent itching, tingling, and burning on a small patch of the upper back—usually between the shoulder blade and spine. Though not dangerous, this chronic condition can be uncomfortable enough to affect daily activities, sleep, and mood.
Epidemiology
The exact frequency of notalgia paresthetica is not fully known, but researchers believe it is relatively common and may be underdiagnosed in many people.[1] Studies suggest that chronic pruritus (which means persistent itchy skin) affects more than 20 percent of the general population at some point in their lives. Within this large group of people experiencing chronic itching, notalgia paresthetica represents approximately 8 percent of all cases.[1][6]
This condition primarily affects adults, especially those over the age of 50.[1][2] Women appear to be affected more often than men, with females representing between 62 and 87 percent of diagnosed cases in various studies.[2][9] While notalgia paresthetica is typically seen in middle-aged and older adults, it rarely occurs in children. When it does appear in young children, it may indicate a rare hereditary condition called multiple endocrine neoplasia type 2A.[1][6]
Interestingly, the condition tends to occur more frequently on the side of the body opposite to a person’s dominant hand. Since most people are right-handed, the left side of the back is more commonly affected.[2][8] This pattern may relate to how people reach to scratch or the positioning of the muscles and nerves involved.
Causes
Researchers do not completely understand what causes notalgia paresthetica, but most agree that it is a type of neuropathy, which means nerve damage or dysfunction.[1][2] The debate continues about whether the problem originates from a pinched nerve coming from the spine (called radiculopathy) or from damage to the nerves in the skin itself (peripheral neuropathy).
Many researchers believe that the condition results from irritation or compression of the thoracic nerves, specifically those from the second to the sixth thoracic segments (T2 to T6) of the spine.[2][3] These nerves have to travel through thick back muscles before they reach the skin, and they make a sharp, right-angled turn as they pass through. This unusual angle may make them especially vulnerable to being squeezed or stretched during normal muscle movements.[2][3]
Several spinal and medical conditions can lead to nerve damage and contribute to notalgia paresthetica. These include degenerative disk disease, which is wear and tear on the cushions between the bones of the spine, and herniated disks, where the soft center of a spinal disk pushes out and may press on nearby nerves.[1][2] Osteoarthritic changes in the spine, which involve bone spurs and stiffness from arthritis, can also contribute to nerve compression.[2][9]
Some medical conditions that affect nerves throughout the body can also play a role. Type 2 diabetes, for example, can damage nerves over time, potentially leading to symptoms like those seen in notalgia paresthetica.[1][6] Infections such as shingles (herpes zoster), which directly affects nerves, have also been identified as possible triggers.[1][3]
Physical factors may contribute as well. Muscle spasms in the back can squeeze the nerves that provide sensation to the skin, causing them to send incorrect signals.[2][8] Some researchers have even suggested that the condition might be caused or worsened by chronic scratching or rubbing with instruments like back scratchers, creating a cycle where scratching leads to more itching.[13]
Risk Factors
Certain groups of people and specific behaviors or health conditions increase the likelihood of developing notalgia paresthetica. Understanding these risk factors can help identify who might be more susceptible to this condition.
Age is one of the most significant risk factors. The condition rarely affects children or young adults, but becomes more common in people over 50 years of age.[1][2] This age-related pattern likely reflects the accumulation of spinal changes over time, including degenerative changes in the vertebrae and disks that can compress or irritate nerves.
Women are at higher risk than men, though the reasons for this gender difference are not fully understood.[1][2] Some researchers have suggested that factors such as differences in spine structure, hormonal influences, or even the use of tight-fitting undergarments like bra straps that compress nerves might contribute to this pattern.[14]
People who spend long periods in poor posture, such as those who work at desks or computer workstations, face increased risk.[2][4] Prolonged sitting with rounded shoulders and a forward head position can stretch and compress the nerves in the upper back. This chronic postural stress creates ongoing irritation that may eventually lead to symptoms.
Individuals with existing spinal problems are more vulnerable. Those who have had back injuries, herniated disks, or degenerative spine disease are at greater risk because these conditions can directly compress or damage the nerves involved.[1][9] Studies have found a particularly high association with cervical (neck) spine disease, especially at the C5-C6 level and at the C6-C7 segment.[4][9]
People with metabolic conditions such as type 2 diabetes have an elevated risk because diabetes can cause widespread nerve damage throughout the body.[1][6] Previous infections that affect nerves, such as shingles, also increase susceptibility.[1][3]
Athletes and individuals who engage in intense exercise, particularly activities that cause muscle stiffness in the upper back, may be at risk.[3] The condition has been reported to start after periods of intense physical activity or, conversely, after prolonged periods of inactivity that lead to muscle weakness and poor posture.[3]
Symptoms
The main and most bothersome symptom of notalgia paresthetica is intense itching (pruritus) in a specific area of the back. This itching typically occurs in the region between the inner edge of the shoulder blade and the spine, usually on one side of the body, though it can occasionally affect both sides.[1][2] The affected area usually corresponds to the skin regions served by the T2 to T6 thoracic nerves, which run in the mid-to-upper portion of the back.[2][4]
The itching sensation can be intermittent, coming and going throughout the day, or it can be continuous and present all the time.[3] What makes this itch particularly frustrating is that scratching does not relieve it, although many people find the act of scratching or rubbing temporarily pleasurable.[3][13] The intensity of the itch can range from mildly bothersome to severe, and for many people, it is severe or very severe.[17]
Beyond itching, people with notalgia paresthetica often experience other abnormal sensations in the same area. These include tingling, similar to a “pins and needles” feeling, as well as numbness or altered sensation when the area is touched.[1][2] Some people describe burning sensations, pain, tenderness, or unusual feelings of heat or cold in the affected patch of skin.[1][9]
An important characteristic of notalgia paresthetica is that it does not begin with a rash. The condition is a nerve problem, not a primary skin condition.[1][2] However, because the itching is so persistent and difficult to resist, most people with the condition eventually develop visible skin changes in the affected area from constant rubbing and scratching. These secondary skin changes include discolored patches (usually darkened or hyperpigmented skin), scratch marks, lumps or bumps, bleeding, scabbing, or even scarring.[1][3][17]
In many patients, the affected area of skin may show altered sensitivity to different types of touch or temperature. When tested with a light touch, pinprick, or warm and cold objects, the sensation may feel different compared to normal skin—either more intense (heightened sensitivity) or less intense (reduced sensitivity).[3][13] Some people also notice that sweating is reduced or absent in the affected area.[3]
The condition is typically chronic, meaning it lasts for extended periods—often months to years.[1][2] Symptoms may go through periods where they worsen and then improve (remissions and exacerbations), but the condition tends to persist over time.[4] The long duration and persistent nature of the symptoms can significantly impact a person’s emotional well-being and daily functioning.[17]
The itch and related symptoms frequently affect mood, causing frustration, irritability, and emotional distress. Sleep is often disrupted, as the itching may worsen at night or make it difficult to find a comfortable sleeping position. Self-care activities such as dressing, bathing, or applying lotions can become uncomfortable or trigger symptoms.[17] For some people, the condition is bothersome enough to interfere with focus at work or participation in social activities.
Prevention
While there is no guaranteed way to prevent notalgia paresthetica entirely, several lifestyle measures and habits may reduce the risk of developing the condition or help prevent its symptoms from worsening.
Maintaining good posture throughout the day is one of the most important preventive strategies. Poor posture, especially during prolonged sitting at work or computer stations, places excessive stress on the spine and back muscles, which can compress or irritate the nerves that lead to notalgia paresthetica.[4][12] Taking regular breaks from sitting, adjusting the height and position of computer monitors to avoid forward head posture, and using ergonomic chairs that support the natural curve of the spine can all help reduce nerve irritation.
Regular physical activity and exercises that strengthen the upper back and improve flexibility may also be protective. Stretching the chest muscles (pectorals) and strengthening the muscles around the shoulder blades and upper spine can help maintain proper posture and reduce the angle at which nerves pass through muscles, potentially decreasing nerve compression.[3][14] Simple exercises such as shoulder blade squeezes, upper back stretches, and thoracic spine mobility exercises can be incorporated into daily routines.
Avoiding activities or situations that place repetitive strain on the upper back and neck may help prevent nerve irritation. For people whose work involves repetitive motions or prolonged positions that stress the upper back, taking frequent breaks and varying positions throughout the day can reduce accumulated stress on vulnerable nerves.
Managing underlying health conditions that can contribute to nerve damage is another important preventive measure. Keeping conditions such as diabetes well-controlled can help prevent or minimize nerve damage throughout the body, potentially reducing the risk of developing neuropathic conditions like notalgia paresthetica.[1]
For people with known spinal problems such as degenerative disk disease or arthritis, working with healthcare providers to manage these conditions may help prevent nerve-related complications. Physical therapy, appropriate medications, and other treatments that maintain spinal health and mobility may reduce the risk of nerve compression that leads to symptoms.[9]
Avoiding excessive compression of the upper back from tight clothing or accessories may also be helpful. Some experts suggest that excessively tight bra straps or other garments that compress the upper back might contribute to nerve irritation in susceptible individuals.[14] Ensuring that clothing fits comfortably without creating pressure points on the back may be a simple preventive measure.
Finally, protecting the skin and nerves from direct injury is important. Avoiding sunburn on the back, which has been identified as a potential trigger in some cases, and being cautious about back injuries during physical activities can help protect the nerves that serve the skin.[3]
Pathophysiology
Pathophysiology refers to the changes in normal body functions that occur when a disease or condition is present. In notalgia paresthetica, the fundamental problem involves dysfunction of the sensory nerves that provide feeling to the skin of the upper back.
The sensory nerves involved in notalgia paresthetica are the cutaneous branches (skin-serving branches) of the thoracic spinal nerves, particularly those from the T2 to T6 segments.[2][9] These nerves originate from the spinal cord in the thoracic (mid-back) region and must travel a long path through thick layers of back muscles before reaching the skin. As they make this journey, the nerves pass through the multifidus spinae muscle and other paraspinal muscles at a sharp, nearly right angle.[2][8]
This unusual anatomical arrangement makes the nerves particularly vulnerable to compression or traction (stretching). When the nerves are partially compressed or injured—whether by degenerative spinal changes, herniated disks, muscle spasms, or chronic postural stress—several changes occur.[1][2] The compression restricts blood flow to the nerves, causes the nerve fibers to swell, and leads to damage of the nerve tissue itself.[6]
When nerves are irritated or damaged in this way, they begin to malfunction. Instead of sending accurate signals about touch, temperature, or normal sensations, the damaged nerves start sending abnormal signals to the brain. These aberrant signals are interpreted by the brain as itching, burning, tingling, or pain, even though there is no actual stimulus causing these sensations.[8] This is why scratching does not relieve the itch—the sensation is being generated by the malfunctioning nerve itself rather than by something happening on the skin surface.
The chronic nature of the nerve irritation appears to affect the itch control mechanisms in the nervous system. The nociceptors (pain-sensing nerve endings) and pruriceptors (itch-sensing nerve endings) in the affected area become hypersensitive and fire inappropriately, creating the persistent itching and altered sensations characteristic of the condition.[8]
Over time, the constant scratching and rubbing that people do in response to the itch causes secondary changes in the skin itself. The mechanical trauma from scratching stimulates melanocytes (the cells that produce skin pigment) to become more active, resulting in the hyperpigmented (darkened) patches commonly seen in notalgia paresthetica.[2][9] The repeated trauma can also lead to thickening of the skin, inflammation, and in some cases, the development of a type of eczema called lichen simplex, which creates a cycle where the thickened, inflamed skin becomes even more itchy.[3]
In the affected area, changes in the small nerve fibers that control various skin functions can be detected. These small fiber changes may explain why some people experience reduced sweating or altered temperature sensation in addition to itching.[3][13] The nerves that normally regulate these functions are not working properly due to the compression or damage.
Some researchers believe that in addition to the local nerve compression in the back, there may be involvement of the cervical (neck) spine as well. Many people with notalgia paresthetica have concurrent cervical spine problems, and treating these neck issues sometimes improves the back symptoms.[4][9] This suggests that nerve pathway dysfunction may occur at multiple levels—both where the nerves exit the spine and where they pass through muscles on their way to the skin.
