Polyarteritis Nodosa (PAN)

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 7 min read
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Polyarteritis nodosa is a serious autoimmune related blood vessel disease. The small and medium-sized arteries become swollen and damaged. Arteries are the blood vessels that carry oxygen-rich blood to organs and tissues. The cause of polyarteritis nodosa is unknown. The condition occurs when certain immune cells attack the affected arteries. More adults than children get this disease. The tissues that are fed by the affected arteries...

Key Takeaways

  • This article explains Causes of Polyarteritis Nodosa in simple medical language.
  • This article explains Symptoms of Polyarteritis Nodosa in simple medical language.
  • This article explains Diagnostic Tests for Polyarteritis Nodosa in simple medical language.
  • This article explains Treatment for Polyarteritis Nodosa in simple medical language.
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Definition

Polyarteritis nodosa is a serious related blood vessel disease. The small and medium-sized become swollen and damaged. Arteries are the blood vessels that carry oxygen-rich blood to organs and tissues. The cause of polyarteritis nodosa is unknown. The condition occurs when certain immune cells attack the affected arteries. More adults than children get this disease. The tissues that are fed by the affected arteries do not get the oxygen and nourishment they need. Damage occurs as a result. People with active B or hepatitis C may develop this disease. Symptoms are caused by damage to affected organs. The skin, joints, muscle, gastrointestinal tract, heart, , and nervous system are often affected. Symptoms include: , decreased appetite, , , joint aches, muscle aches, unintentional , and . If nerves are affected, you may have , , burning, and weakness. Damage to the nervous system may cause strokes or seizures. Current treatments with steroids and other drugs that suppress the immune system can improve symptoms and the chance of long-term survival. The most serious complications usually involve the kidneys and gastrointestinal tract.

Polyarteritis nodosa (PAN) is a blood vessel disease characterized by of small and medium-sized arteries (vasculitis), preventing them from bringing oxygen and food to organs.[1][2] Most cases occur in the 4th or 5th decade of life, although it can occur at any age.[3] PAN most commonly affects vessels related to the skin, joints, peripheral nerves, gastrointestinal tract, heart, eyes, and kidneys.[3][4] Symptoms are caused by damage to affected organs and may include fever, fatigue, weakness, , weight loss, muscle and joint aches, rashes, numbness, and abdominal pain. The underlying cause of PAN is unknown. Treatment involves medicines to suppress inflammation and the immune system, including steroids.[2]

There is no cure for polyarteritis nodosa (PAN), but the disease and its symptoms can be managed. The goal of treatment is to prevent and further organ damage.[6] The exact treatment depends on the severity in each person.[7] While many people do well with treatment, relapses can occur.[6]

Types of Polyarteritis Nodosa

There are two main types of PAN:

  1. Classic PAN: This is the most common type. It affects various organs and tissues, leading to a wide range of symptoms.
  2. Hepatitis B-Related PAN: In some cases, PAN is associated with hepatitis B . This type of PAN is often more .

Causes of Polyarteritis Nodosa

The exact cause of PAN is not well understood, but it is thought to be related to problems with the immune system. Here are some possible triggers and factors that may contribute to PAN:

  1. Autoimmune Dysfunction: PAN occurs when the immune system mistakenly attacks healthy blood vessels.
  2. Hepatitis B Infection: In some cases, PAN is associated with hepatitis B virus infection.
  3. Factors: There may be a genetic predisposition to developing PAN, although more research is needed.

Symptoms of Polyarteritis Nodosa

PAN can have a wide range of symptoms, depending on which organs are affected. Common symptoms may include:

  1. Fatigue: Feeling extremely tired all the time.
  2. Fever: Persistent high body temperature.
  3. Muscle and Joint Pain: Aching and in muscles and joints.
  4. Skin : Rashes that may be painful or itchy.
  5. Nerve Problems: , numbness, or weakness in the limbs.
  6. Abdominal Pain: Pain in the , often severe.
  7. Weight Loss: Unexplained weight loss.
  8. High Blood Pressure: can be a result of PAN affecting the kidneys.
  9. Digestive Problems: , , and .
  10. Heart Problems: , irregular heartbeats, and other cardiac issues.

Diagnostic Tests for Polyarteritis Nodosa

To diagnose PAN, doctors may use a combination of tests and procedures:

  1. Blood Tests: These can reveal signs of inflammation and specific antibodies associated with PAN.
  2. : A small piece of tissue from an affected organ is examined under a microscope to confirm PAN.
  3. : A special dye is used to visualize blood vessels and identify areas of inflammation.
  4. MRI or CT Scan: These imaging techniques can provide detailed images of affected organs.

Treatment for Polyarteritis Nodosa

Treating PAN is crucial to manage symptoms and prevent complications. The main goals of treatment are to suppress the immune system’s abnormal response and reduce inflammation. Here are common treatments:

  1. Corticosteroids: These drugs, like prednisone, help reduce inflammation and control the immune system.
  2. Immunosuppressive Medications: Drugs such as cyclophosphamide or azathioprine may be prescribed to suppress the immune response.
  3. Plasma Exchange: In severe cases, plasma exchange can remove harmful antibodies from the blood.
  4. Blood Pressure Medications: Medications like ACE inhibitors are used to manage high blood pressure caused by PAN.
  5. Pain Management: Over-the-counter or prescription pain relievers can help with pain and discomfort.

Drugs for Polyarteritis Nodosa

There are various medications used to treat PAN and manage its symptoms. Some of the common drugs include:

  1. Prednisone: A corticosteroid that reduces inflammation.
  2. Cyclophosphamide: An immunosuppressive medication.
  3. Methotrexate: Another immunosuppressive drug.
  4. Azathioprine: Helps suppress the immune system.
  5. Rituximab: Targets specific immune cells involved in PAN.
  6. Pain Relievers: Over-the-counter options like acetaminophen or prescription pain medications.
  7. Antihypertensives: Medications to control high blood pressure.
  8. Antiviral Drugs: In cases of hepatitis B-related PAN, antiviral medications may be prescribed.

Remember, the choice of medication and treatment plan will depend on the severity of your condition and your specific symptoms.

In summary, Polyarteritis nodosa (PAN) is a rare autoimmune disease that affects blood vessels. There are two main types, classic PAN and hepatitis B-related PAN. While the exact cause remains unclear, it is thought to involve immune system dysfunction. Symptoms can vary widely and affect different organs. Diagnosis involves blood tests, biopsies, and imaging. Treatment aims to reduce inflammation and manage symptoms, often including corticosteroids and immunosuppressive drugs. Close collaboration with healthcare professionals is essential for effective management of PAN.

 

Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, previous medical  history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. Thank you for giving your valuable time to read the article.

  1. https://medlineplus.gov/skinconditions.html
  2. https://www.aad.org/about/burden-of-skin-disease
  3. https://www.usa.gov/federal-agencies/national-institute-of-arthritis-musculoskeletal-and-skin-diseases
  4. https://www.cdc.gov/niosh/topics/skin/default.html
  5. https://www.skincancer.org/
  6. https://illnesshacker.com/
  7. https://endinglines.com/
  8. https://www.jaad.org/
  9. https://www.psoriasis.org/about-psoriasis/
  10. https://books.google.com/books?
  11. https://www.niams.nih.gov/health-topics/skin-diseases
  12. https://cms.centerwatch.com/directories/1067-fda-approved-drugs/topic/292-skin-infections-disorders
  13. https://www.fda.gov/files/drugs/published/Acute-Bacterial-Skin-and-Skin-Structure-Infections—Developing-Drugs-for-Treatment.pdf
  14. https://dermnetnz.org/topics
  15. https://www.aaaai.org/conditions-treatments/allergies/skin-allergy
  16. https://www.sciencedirect.com/topics/medicine-and-dentistry/occupational-skin-disease
  17. https://aafa.org/allergies/allergy-symptoms/skin-allergies/
  18. https://www.nibib.nih.gov/
  19. https://rxharun.com/resources/category/resources/rxharun/article-types/skin-care-beauty/skin-diseases-types-symptoms-treatment/
  20. https://www.nei.nih.gov/
  21. https://en.wikipedia.org/wiki/List_of_skin_conditions
  22. https://en.wikipedia.org/?title=List_of_skin_diseases&redirect=no
  23. https://en.wikipedia.org/wiki/Skin_condition
  24. https://oxfordtreatment.com/
  25. https://www.nidcd.nih.gov/health/
  26. https://consumer.ftc.gov/articles/w
  27. https://www.nccih.nih.gov/health
  28. https://catalog.ninds.nih.gov/
  29. https://www.aarda.org/diseaselist/
  30. https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets
  31. https://www.nibib.nih.gov/
  32. https://www.nia.nih.gov/health/topics
  33. https://www.nichd.nih.gov/
  34. https://www.nimh.nih.gov/health/topics
  35. https://www.nichd.nih.gov/
  36. https://www.niehs.nih.gov
  37. https://www.nimhd.nih.gov/
  38. https://www.nhlbi.nih.gov/health-topics
  39. https://obssr.od.nih.gov/
  40. https://www.nichd.nih.gov/health/topics
  41. https://rarediseases.info.nih.gov/diseases
  42. https://beta.rarediseases.info.nih.gov/diseases
  43. https://orwh.od.nih.gov/

 

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Start with a registered doctor or the nearest qualified health center.

What to tell the doctor

  • Write when the problem started and how it changed.
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Questions to ask

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Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
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  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
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Avoid these mistakes

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Get urgent help if

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Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Medicine doctor / pediatrician for children / qualified clinician
Tests to discuss with doctor
  • Temperature chart and hydration assessment
  • CBC with platelet count if fever persists or dengue/other infection is possible
  • Urine test, malaria/dengue tests, chest evaluation, or blood culture only when clinically indicated
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
  • Do I need antibiotics, or is this more likely viral?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

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Care roadmap for: Polyarteritis Nodosa (PAN)

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

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