Thromboangiitis obliterans, commonly known as Buerger disease, is a rare inflammatory condition affecting the blood vessels in the arms and legs, strongly linked to tobacco use and primarily seen in young adults.
Epidemiology
Thromboangiitis obliterans is a relatively uncommon disease, and its occurrence has been declining over recent decades. This decrease is largely connected to reduced smoking rates in many parts of the world and the adoption of more precise diagnostic standards by medical professionals. Understanding who is affected by this condition and where it occurs most frequently helps paint a clearer picture of its global impact.[1][2]
In the United States, the prevalence of this disease has dropped significantly over time. In 1947, there were approximately 104 cases per 100,000 people. By recent estimates, this number has fallen to roughly 12 to 20 cases per 100,000 population. This represents a substantial decline that mirrors the reduction in tobacco consumption across the country. Today, with fewer people smoking, Buerger disease has become quite rare in North America.[3][7]
The disease does not affect all populations equally. The highest rates are found in certain ethnic and geographical groups. Israeli Jews of Ashkenazi descent, along with people from India, Korea, and Japan, show the greatest incidence of thromboangiitis obliterans. In contrast, individuals of northern European descent are less frequently affected. Countries in the Middle East, Asia, the Mediterranean region, and Eastern Europe report more cases compared to Western nations, which aligns with higher tobacco consumption patterns in these areas.[3][5]
Age plays a critical role in who develops this condition. Most patients are between 20 and 45 years old when symptoms first appear. The disease does not occur in children or elderly individuals, making it distinctly a condition of young to middle-aged adults. This age pattern is one of the distinguishing features that helps doctors identify Buerger disease and separate it from other vascular conditions.[3][7]
Gender differences are also notable in thromboangiitis obliterans. Historically, men have been much more commonly affected, with a male-to-female ratio of approximately 3 to 1. However, this gap appears to be narrowing. More women are being diagnosed with the disease in recent years, a trend that health experts attribute to the growing number of women who smoke cigarettes. As tobacco use patterns change across genders, the demographic profile of those affected by Buerger disease is shifting as well.[3][7]
Causes
The exact cause of thromboangiitis obliterans remains a medical mystery, though researchers have identified strong connections between the disease and certain factors. While scientists cannot point to a single definitive trigger, tobacco exposure stands out as an essential element in both the development and progression of this condition. Without tobacco use, the disease essentially does not occur.[2][3]
Nearly all patients diagnosed with Buerger disease have a history of tobacco consumption. This includes not only cigarette smoking but also the use of chewing tobacco, snuff, and even marijuana. The relationship is so strong that tobacco exposure is considered a requirement for the disease to begin and continue. Even in extremely rare cases where someone without obvious tobacco use develops similar symptoms, doctors must carefully investigate whether any form of exposure occurred.[2][4]
Scientists believe that something within tobacco products damages the inner lining of blood vessels. This damage may trigger an abnormal response in the body’s immune system. Some research suggests that people with Buerger disease show heightened sensitivity to tobacco extracts. When tobacco components are injected into the skin of affected individuals during testing, they exhibit stronger reactions than people without the disease. This suggests that their bodies process tobacco differently, perhaps recognizing it as a harmful substance that needs to be attacked.[2][3]
There is growing evidence that the immune system plays a central role in thromboangiitis obliterans. Patients often show increased sensitivity to certain proteins found in blood vessel walls, specifically type I and type III collagen (a structural protein that provides strength to tissues). Their blood tests frequently reveal elevated levels of anti-endothelial cell antibodies (proteins that mistakenly attack the cells lining blood vessels). These findings suggest the disease might involve an autoimmune component, where the body’s defense system incorrectly targets its own blood vessels.[2][3]
Genetics may also contribute to susceptibility. Research has discovered that people with Buerger disease are more likely to carry certain genetic markers called human leukocyte antigens (HLA), specifically HLA-A9, HLA-B5, and HLA-54. These markers are part of the immune system and help the body distinguish between its own cells and foreign invaders. The increased prevalence of these markers in affected individuals suggests that some people may be genetically predisposed to developing the disease when exposed to tobacco.[3][10]
Another theory involves impaired function of the blood vessel walls themselves. In healthy individuals, the inner lining of blood vessels (the endothelium) helps regulate blood flow by releasing substances that cause vessels to relax or constrict as needed. In people with thromboangiitis obliterans, this normal relaxation response appears to be damaged. The vessels lose their ability to properly control blood flow, contributing to the symptoms and complications of the disease.[3]
Risk Factors
Certain characteristics and behaviors dramatically increase the likelihood of developing thromboangiitis obliterans. Understanding these risk factors is crucial because avoiding them, particularly tobacco, can prevent the disease entirely or stop its progression once it has started.[2][9]
Tobacco use in any form represents the single most important risk factor for Buerger disease. Smoking cigarettes carries the highest risk, but the danger extends beyond traditional cigarettes. People who roll their own cigarettes appear to face even greater risk, possibly due to the different tobacco blends or rolling papers they use. Chewing tobacco and using snuff (a smokeless tobacco product) also increase susceptibility. Even marijuana smoking has been linked to the development of thromboangiitis obliterans, suggesting that inhaling smoke from various substances can trigger the disease in vulnerable individuals.[2][9]
Being male historically carried a higher risk, though this gap is narrowing as smoking patterns change. Men aged 20 to 45 who are heavy smokers represent the most commonly affected group. The disease seems to particularly target individuals who begin smoking at a young age and maintain heavy tobacco use throughout their twenties and thirties. However, as mentioned earlier, the increasing number of female smokers has led to more women being diagnosed with the condition.[3][7]
Age represents another clear risk factor. The typical age range when symptoms begin is between 20 and 50 years old, with most cases clustering around 35 years of age. This specific age pattern is so consistent that if someone outside this range presents with similar symptoms, doctors will usually look for other causes first. The disease simply does not affect children or elderly people, making age an important diagnostic clue.[3][5]
Ethnicity and geographical origin influence risk as well. People from certain backgrounds face higher odds of developing thromboangiitis obliterans. This includes individuals of Jewish Ashkenazi descent, and those with Indian, Korean, or Japanese ancestry. People living in or originating from the Middle East, Mediterranean countries, and Eastern Europe also show elevated rates. These patterns suggest that genetic factors related to ethnic background may interact with tobacco exposure to trigger the disease.[3][5]
Interestingly, many people with Buerger disease also have poor dental health. This is most likely a consequence of tobacco use rather than an independent risk factor, since smoking contributes to both gum disease and thromboangiitis obliterans. However, the correlation is strong enough that healthcare providers often notice it during patient examinations.[5]
Symptoms
The symptoms of thromboangiitis obliterans develop gradually over time and can be quite painful and debilitating. They reflect the progressive blockage of blood vessels in the hands and feet, which deprives these areas of the oxygen and nutrients they need to function properly. Understanding these symptoms helps patients recognize when to seek medical attention.[1][2]
Early in the disease, many people experience severe pain in their legs and arms, particularly during rest. This might seem counterintuitive since most people associate pain with activity, but in Buerger disease, the pain often becomes worse when the body is relaxed. The discomfort is frequently described as a burning or tingling sensation in the hands and feet. This pain can be intense enough to disrupt sleep and daily activities, significantly affecting quality of life.[2][5]
As blood flow becomes increasingly restricted, patients may notice their fingers or toes developing unusual color changes. The affected digits might appear pale, red, or bluish. These color shifts reflect inadequate blood supply and oxygen delivery to the tissues. The intensity and type of discoloration can vary depending on skin tone, making these changes more obvious in some individuals than others. Along with color changes, the hands and feet often feel cold to the touch, even in warm environments.[1][5]
Many people with thromboangiitis obliterans experience a condition called Raynaud’s phenomenon (a disorder where blood vessels in the fingers and toes temporarily narrow in response to cold or stress). During these episodes, fingers and toes turn white, then blue, and finally red as blood flow returns. These color changes are accompanied by numbness, tingling, and pain. Exposure to cold temperatures or emotional stress can trigger these episodes, causing significant discomfort.[1][2]
Walking can become increasingly difficult and painful. Patients often develop what doctors call claudication (pain in the legs that occurs during walking or exercise due to inadequate blood flow). The pain typically appears in the legs, ankles, or feet after walking a certain distance and improves with rest. In Buerger disease, this pain is frequently felt in the arch of the foot. As the disease progresses, the distance a person can walk before pain begins gets shorter and shorter, severely limiting mobility.[2][5]
The skin on affected hands and feet may undergo changes in texture and appearance. It can become thin and shiny, and hair growth in these areas may diminish or stop altogether. These changes reflect chronic poor blood supply to the skin and underlying tissues. The skin becomes more fragile and vulnerable to injury.[4][5]
As thromboangiitis obliterans advances, more serious complications emerge. Painful sores or ulcers (open wounds) may develop on the fingers and toes. Unlike typical cuts or scrapes that heal within days or weeks, these ulcers do not heal properly because the damaged blood vessels cannot deliver enough blood to support the healing process. The ulcers are extremely painful and prone to infection. If left untreated, the lack of blood flow can lead to tissue death, a condition known as gangrene (death of body tissue due to lack of blood supply). When gangrene occurs, the affected tissue turns black and may need to be surgically removed through amputation.[1][2]
Some patients experience other symptoms that might initially be mistaken for different conditions. In the early stages, pain in the feet or hands might be confused with joint problems or nerve disorders. Up to 16 percent of people with Buerger disease develop episodes of migratory superficial phlebitis (inflammation of the veins near the skin surface that moves from one location to another). This causes red, tender areas along the veins that come and go, indicating a systemic inflammatory response throughout the body.[3][10]
In the affected areas, patients may notice reduced or absent pulses. When doctors examine patients, they often cannot feel the normal pulses in the feet, ankles, or wrists because the blood vessels are so blocked. This is an important clinical finding that helps confirm the diagnosis.[6]
Prevention
Preventing thromboangiitis obliterans is straightforward in concept but can be challenging in practice: it requires complete avoidance of all tobacco products. Since tobacco use is essentially required for the disease to develop, people who never use tobacco will not get Buerger disease. For those already diagnosed, prevention focuses on stopping disease progression and avoiding complications.[8][15]
The most critical preventive measure is never starting to use tobacco in any form. This includes cigarettes, cigars, pipes, chewing tobacco, snuff, and even marijuana. Young adults, particularly men in their twenties and thirties who are at highest risk for developing the disease, should be especially cautious about tobacco use. Given that Buerger disease typically appears in heavy smokers, avoiding tobacco completely eliminates the primary trigger for the condition.[5][8]
For individuals already diagnosed with thromboangiitis obliterans, absolute and complete tobacco cessation represents the only way to prevent the disease from getting worse. This cannot be emphasized enough. Even smoking one or two cigarettes per day is sufficient to keep the disease active and progressive. Patients must stop using all forms of tobacco and nicotine, including cigarettes, cigars, chewing tobacco, snuff, marijuana, electronic cigarettes, and vaping devices. They should also avoid nicotine replacement products like patches or gum, as even nicotine alone may contribute to disease activity.[8][9]
Avoiding secondhand smoke is also important. Exposure to other people’s tobacco smoke may contribute to disease progression, so patients should stay away from environments where smoking occurs. This might require changes in social situations or living arrangements to minimize exposure.[9][13]
People with a history of Raynaud’s phenomenon or who have experienced blue, painful fingers or toes, especially with ulcers, should be particularly vigilant about avoiding all forms of tobacco. These symptoms may be early warning signs of vascular problems, and tobacco use in such individuals could trigger or worsen thromboangiitis obliterans.[5]
Smoking cessation programs and support are crucial for people struggling to quit. Healthcare providers strongly recommend structured stop-smoking programs, counseling, and behavioral modification therapies. While nicotine replacement is typically used to help people quit smoking, patients with Buerger disease need to work closely with their doctors to develop alternative strategies that do not involve nicotine. Some patients may benefit from medications that reduce cravings without containing nicotine, along with psychological support to address the addiction.[8][11]
Beyond tobacco avoidance, certain lifestyle measures can help protect blood vessels and reduce symptoms in people at risk or already affected. Avoiding cold temperatures is important, as cold causes blood vessels to narrow further, reducing blood flow even more. Patients should dress warmly, wear gloves and warm socks, and avoid prolonged exposure to cold environments. Protecting the hands and feet from injury is also essential, since even minor cuts or scrapes may not heal properly due to poor blood circulation.[5][6]
Regular exercise, when tolerable, may help improve circulation. Walking programs can be beneficial, though patients should work with their healthcare providers to develop appropriate exercise plans that accommodate their symptoms and limitations. Gradually increasing physical activity may help maintain whatever blood flow remains and potentially develop small alternative pathways (called collateral circulation) around blocked vessels.[8]
Pathophysiology
Understanding what happens inside the body when thromboangiitis obliterans develops helps explain why the symptoms occur and why tobacco cessation is so critical for treatment. The disease involves complex changes at the microscopic level within blood vessels that progressively impair circulation to the hands and feet.[3][10]
Thromboangiitis obliterans is classified as a non-atherosclerotic disease, meaning it is fundamentally different from the more common type of vascular disease caused by cholesterol plaque buildup. Instead of plaque accumulation narrowing the vessels, Buerger disease involves inflammation and abnormal clotting affecting small and medium-sized arteries and veins. The disease typically targets vessels in the arms and legs, particularly those below the elbows and knees, though it can occasionally affect other areas of the body.[3][5]
In the acute phase of the disease, the inflammation begins within the innermost layer of the blood vessel wall, called the tunica intima (the smooth inner lining that normally allows blood to flow freely). This initial inflammation triggers a cascade of events that leads to abnormal clotting. Thrombosis (the formation of blood clots inside blood vessels) occurs, creating highly cellular clots that contain dense collections of white blood cells, particularly polymorphonuclear leukocytes (a type of immune cell that responds to inflammation). These clots gradually block the vessel, severely restricting blood flow.[3][7]
A distinctive feature of Buerger disease is that the inflammation involves all three layers of the blood vessel wall, not just one layer. Microscopic examination reveals the presence of microabscesses (tiny pockets of infection-like inflammation) and multinucleated giant cells (large immune cells formed when multiple smaller cells fuse together in response to chronic inflammation). These findings are characteristic of thromboangiitis obliterans and help doctors distinguish it from other forms of vasculitis (inflammation of blood vessels).[3][10]
As the disease enters a chronic phase, the nature of the inflammation changes. The initial acute cellular inflammation decreases, and the blood vessel wall begins to undergo fibrosis, where normal tissue is gradually replaced by scar tissue. This scarring permanently damages the vessel structure and function. The once-flexible blood vessels become rigid and unable to properly regulate blood flow. Even if inflammation subsides, the structural damage remains.[3][10]
One important characteristic that distinguishes thromboangiitis obliterans from other types of vasculitis is that the blood vessel wall itself is relatively spared from destruction, at least initially. While severe inflammation is present, the structural integrity of the vessel wall is maintained longer than in other inflammatory vessel diseases. This feature, combined with the highly cellular nature of the thrombus and the segmental pattern of involvement (where disease affects certain segments of vessels while skipping others), helps pathologists confirm the diagnosis when tissue samples are examined under a microscope.[3][16]
The veins can also be affected by thromboangiitis obliterans, though arteries are involved more frequently and severely. When veins are affected, patients may experience episodes of superficial thrombophlebitis (inflammation and clotting in veins near the skin surface). These episodes can move around the body, appearing in different locations at different times, which is why it is called migratory phlebitis. This venous involvement further complicates the disease and can limit surgical options later, since healthy veins are needed for bypass procedures.[3][10]
At the cellular level, several abnormalities have been identified in people with Buerger disease. They show enhanced sensitivity to collagen types I and III, which are structural proteins found in blood vessel walls. Their immune systems appear to recognize these normal proteins as foreign, leading to an attack on the vessel walls. Impaired endothelium-dependent vasorelaxation (the normal ability of blood vessel linings to release substances that help vessels relax and widen) has also been documented. This means the vessels cannot properly dilate to increase blood flow when needed, compounding the problems caused by inflammation and clotting.[3][10]
Blood tests in affected individuals often reveal increased levels of anti-endothelial cell antibodies. These are proteins produced by the immune system that mistakenly target the cells lining blood vessels. The presence of these antibodies suggests an autoimmune component to the disease, where the body’s defense system incorrectly attacks its own tissues. This autoimmune element may explain why some people are more susceptible to developing the disease when exposed to tobacco.[3][10]
The segmental nature of the disease is also notable. Rather than affecting blood vessels uniformly, thromboangiitis obliterans tends to involve certain segments while leaving adjacent areas relatively normal. This patchy distribution can make diagnosis challenging but is another characteristic feature of the condition. As the disease progresses, more segments become involved, gradually extending the areas of poor circulation.[3][7]
The end result of all these pathological changes is severe reduction or complete blockage of blood flow to the fingers, toes, hands, and feet. Without adequate blood supply, tissues cannot receive the oxygen and nutrients they need to survive. This leads to the pain, color changes, ulceration, and eventually gangrene that characterize advanced Buerger disease. The body attempts to compensate by developing small alternative blood flow pathways, but in thromboangiitis obliterans, these collateral vessels are often insufficient to meet tissue needs, especially during activity when demand for oxygen increases.[5][10]
