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PubMed This is a summary of 14 peer-reviewed journal articles Updated
Vascular Surgery

The Biology of Buerger Disease: Why It’s Not Just "Clogged Arteries"

At a Glance

Buerger disease is not caused by fat or cholesterol buildup like typical clogged arteries. It is an inflammatory condition where tobacco or cannabis triggers the immune system to attack small and medium blood vessels, causing cellular clots that block blood flow to hands and feet.

Understanding the biology of Buerger disease helps clarify why it requires a different approach than common heart or “circulation” problems. While most people are familiar with “clogged arteries” caused by fat and cholesterol, Buerger disease is an entirely different process driven by your immune system’s reaction to tobacco and cannabis. By looking at the cellular level, we can see why complete cessation is so vital to stopping the disease.

The Biological Mechanism: A “Storm” in the Vessel

Buerger disease, or thromboangiitis obliterans (TAO), is an inflammatory vasculitis [1][2]. This means the walls of your small and medium blood vessels become the target of an intense immune response.

  1. Immune Activation: When exposed to tobacco or cannabis, your body triggers a specific biological alarm (a signaling pathway) [1][3]. This alarm mistakenly tells your immune system to attack the blood vessels.
  2. Cellular Infiltration: Special white blood cells, normally meant to fight infections, rush to the lining of your blood vessels [4][5]. Here, they cause unintended damage to the endothelium (the smooth inner lining of your vessels) [6][7].
  3. The Inflammatory Thrombus: As the lining becomes damaged and “sticky” with adhesion molecules, your blood begins to clot inside the vessel [6][8]. Unlike a standard blood clot, this is a “highly cellular” thrombus, meaning it is packed with inflammatory cells that block blood flow to your fingers and toes [9][1].

Buerger Disease vs. Atherosclerosis (Plaque)

It is common for patients to confuse Buerger disease with atherosclerosis (standard Peripheral Artery Disease), but they are biologically distinct:

Feature Buerger Disease (TAO) Atherosclerosis (PAD)
Primary Cause Immune-mediated inflammation [1] Lipid (fat/cholesterol) buildup [1]
Vessel Wall The wall structure is often preserved [1] The wall is thickened and remodeled [1]
Location Small/medium vessels (hands/feet) [10] Larger vessels (calves/thighs/aorta) [9]
Patient Profile Usually younger smokers [9] Usually older; often with high cholesterol [9]

Differentiating from Other Conditions

Because Buerger disease is rare, doctors must carefully rule out “look-alike” conditions by looking for specific biological markers:

  • Autoimmune Vasculitis: Conditions like Takayasu arteritis cause systemic inflammation. In Buerger disease, blood tests for general inflammation (like CRP or ESR) are often surprisingly normal, even when the disease is active [2][11].
  • Raynaud’s Phenomenon: While both cause color changes in the fingers, Raynaud’s is a temporary vasospasm (narrowing) of the vessel [1][12]. Buerger disease involves a physical blockage (thrombus) that does not simply “go away” when you warm up [1].
  • Emboli (Traveling Clots): Doctors use imaging to ensure a clot didn’t travel from the heart to the limb. In Buerger disease, imaging often reveals “corkscrew” collaterals—tiny, wiggly new blood vessels that the body grows to try and bypass the blockage [10][13].
  • Thrombophilia (Clotting Disorders): Doctors may test your blood to see if you have a genetic tendency to clot. In most Buerger patients, these standard genetic tests come back normal, confirming the tobacco-triggered inflammation is the primary driver [1][14].

Common questions in this guide

How is Buerger disease different from clogged arteries?
Standard clogged arteries, known as atherosclerosis, are caused by the buildup of fat and cholesterol over time. In contrast, Buerger disease is caused by an immune system reaction to tobacco or cannabis that triggers intense inflammation and blood clots in the vessel walls.
Why do my fingers and toes turn white or blue with Buerger disease?
The color changes occur because inflammatory cells create physical blood clots that block blood flow to your extremities. Unlike temporary vessel spasms seen in conditions like Raynaud's phenomenon, these blockages do not simply go away when you warm up your hands.
What are 'corkscrew' collateral vessels?
Corkscrew collaterals are tiny, twisted new blood vessels your body grows to try and bypass the blockages caused by the disease. Doctors often look for these uniquely shaped vessels on imaging scans to help confirm a Buerger disease diagnosis.
Will standard blood tests show Buerger disease inflammation?
Surprisingly, general blood tests for inflammation, such as CRP or ESR, often come back completely normal in patients with Buerger disease. Doctors use these normal results to help distinguish Buerger disease from other systemic autoimmune conditions.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Does my imaging show the 'corkscrew' collateral vessels that are typical of Buerger disease?
  2. 2.How does the structure of my vessel walls look—is there evidence of plaque (atherosclerosis) or is the wall itself preserved but blocked by a clot?
  3. 3.Were my inflammatory markers like ESR and CRP normal? Does that help rule out other types of systemic vasculitis?
  4. 4.Why do you believe this is Buerger disease rather than a condition caused by blood clots traveling from my heart (emboli)?
  5. 5.Can we test for endothelial dysfunction to see how the lining of my blood vessels is reacting to the inflammation?

Questions For You

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References

References (14)
  1. 1

    Pathogenesis of thromboangiitis obliterans: Gene polymorphism and immunoregulation of human vascular endothelial cells.

    Sun XL, Law BY, de Seabra Rodrigues Dias IR, et al.

    Atherosclerosis 2017; (265()):258-265 doi:10.1016/j.atherosclerosis.2017.08.009.

    PMID: 28864202
  2. 2

    Recent Updates and Advances in Winiwarter-Buerger Disease (Thromboangiitis Obliterans): Biomolecular Mechanisms, Diagnostics and Clinical Consequences.

    Fazeli B, Ligi D, Keramat S, et al.

    Diagnostics (Basel, Switzerland) 2021; (11(10)) doi:10.3390/diagnostics11101736.

    PMID: 34679434
  3. 3

    Toll-like receptor signaling pathway involved in pathogenesis of thromboangiitis obliterans through activating of NF-κB.

    Guo F, Bi Y, Yin J, Guo Y

    Clinics (Sao Paulo, Brazil) 2024; (79()):100357 doi:10.1016/j.clinsp.2024.100357.

    PMID: 38640750
  4. 4

    Unexpected Inflammation in the Sympathetic Ganglia in Thromboangiitis Obliterans.

    Farzadnia M, Ravari H, Masoudian M, et al.

    The International journal of angiology : official publication of the International College of Angiology, Inc 2017; (26(4)):212-217 doi:10.1055/s-0037-1604410.

    PMID: 29142485
  5. 5

    Senescent CD153+ T Lymphocytes Increase in the Peripheral Blood of Patients with Thromboangiitis Obliterans.

    Mashhadi N, Kasraian L, Ghoddusi Johari H, et al.

    Iranian journal of immunology : IJI 2023; (20(3)):262-275 doi:10.22034/iji.2023.99188.2622.

    PMID: 37647581
  6. 6

    Cilostazol on the expression of ICAM-1, VCAM-1 and inflammatory factors in plasma in patients with thromboangiitis obliterans.

    Song F, Ji B, Chen T

    Experimental and therapeutic medicine 2018; (16(3)):2349-2354 doi:10.3892/etm.2018.6436.

    PMID: 30186478
  7. 7

    MiR-223 alleviates thrombus and inflammation in thromboangiitis obliterans rats by regulating NLRP3.

    Zhou H, Li CL, Xia PZ, He YX

    European review for medical and pharmacological sciences 2020; (24(20)):10605-10611 doi:10.26355/eurrev_202010_23418.

    PMID: 33155218
  8. 8

    Mailuoning oral liquid ameliorates vasculitis in thromboangiitis obliterans rats via inactivating cGAS-STING-IRF3 and TLR4-MAPKs/NF-κB signaling pathways.

    Fan L, Tang K, Li J, et al.

    Journal of ethnopharmacology 2025; (337(Pt 1)):118707 doi:10.1016/j.jep.2024.118707.

    PMID: 39181282
  9. 9

    Thromboangiitis obliterans (Buerger's disease).

    Rivera-Chavarría IJ, Brenes-Gutiérrez JD

    Annals of medicine and surgery (2012) 2016; (7()):79-82 doi:10.1016/j.amsu.2016.03.028.

    PMID: 27144003
  10. 10

    [Thromboangiitis obliterans: an update 2025].

    Stammler F

    Deutsche medizinische Wochenschrift (1946) 2025; (150(23)):1440-1446 doi:10.1055/a-2660-1858.

    PMID: 41213536
  11. 11

    The IL-33/sST2 Axis in Thromboangiitis Obliterans.

    Sharebiani H, Mohareri M, Mirhosseini A, Fazeli B

    Journal of inflammation research 2020; (13()):317-323 doi:10.2147/JIR.S253980.

    PMID: 32765040
  12. 12

    Pathogenesis and Management of Buerger's Disease.

    Liew NC, Lee L, Nor Hanipah Z, et al.

    The international journal of lower extremity wounds 2015; (14(3)):231-5 doi:10.1177/1534734615599654.

    PMID: 26264874
  13. 13

    Structural Abnormality or Vascular Dysfunction? A Road to Ruin.

    Yamagishi SI

    Journal of atherosclerosis and thrombosis 2016; (23(11)):1255-1256 doi:10.5551/jat.ED047.

    PMID: 27169918
  14. 14

    A Non-smoking Woman with Anti-phospholipid Antibodies Proved to Have Thromboangiitis Obliterans.

    Shima N, Akiyama Y, Yamamoto S, et al.

    Internal medicine (Tokyo, Japan) 2020; (59(3)):439-443 doi:10.2169/internalmedicine.3372-19.

    PMID: 31588083

This page explains the biology and mechanism of Buerger disease for educational purposes only. It does not replace professional medical advice. Always consult your vascular specialist regarding your specific symptoms and diagnosis.

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