Microscopic Polyangiitis (MPA)

What is Microscopic Polyangiitis?

Microscopic polyangiitis (MPA) is a necrotizing vasculitis, meaning inflammation that damages small blood vessels such as capillaries, venules and arterioles. It belongs to the group of ANCA-associated vasculitides, which also includes granulomatosis with polyangiitis and eosinophilic granulomatosis with polyangiitis.^{[1, 2]} It is a rare disease and among the most serious forms of autoimmune inflammation.^[3]

Common symptoms

MPA often affects the kidneys, lungs, skin and peripheral nerves.^[3] It commonly causes glomerulonephritis (inflammation of the kidney filters) and capillary inflammation in the lungs, and it is more likely than granulomatosis with polyangiitis to involve the kidneys.^[1]

General symptoms such as fatigue, fever, weight loss and joint or muscle pain are common, along with rash, blood in the urine, cough or coughing up blood, and numbness or weakness in the hands and feet. Which symptoms appear depends on the organs involved.

Causes and risk factors

The cause is not fully understood. It is an autoimmune disease in which ANCA antibodies and activated white blood cells, with other immune events such as complement pathway activation, drive inflammation in small vessels.^[3] Genetic susceptibility, infections and some medicines have been suggested as triggers.^[1]

How it is diagnosed and treated conventionally

Diagnosis rests on symptoms, ANCA blood testing and biopsy of an affected organ.^{[1, 4]} ANCA tests help but are neither necessary nor sufficient on their own for the diagnosis.^[1]

Treatment is directed by specialists. For life-threatening or organ-threatening disease, the EULAR recommendations advise high-dose glucocorticoids with rituximab or cyclophosphamide, tapered over months, and rituximab for maintenance. Plasma exchange may be considered in rapidly progressive glomerulonephritis, and avacopan may reduce steroid exposure.^[4] The British Society for Rheumatology also issued updated recommendations in 2025.^[5]

Earlier diagnosis has improved survival, and attention has shifted to long-term problems such as chronic kidney disease, cardiovascular disease and the effects of glucocorticoids.^[3]

Why Microscopic Polyangiitis calls for a whole-person approach

MPA is an organ-threatening disease, so the first priority is medical treatment that controls vessel inflammation. Alongside that, many people are left with fatigue, pain, poor sleep, nerve symptoms and the effects of long-term medication.

The points below describe areas where supportive care is sometimes considered. They have not been studied in MPA itself.

Treatment side effects

Reducing exposure to glucocorticoids is a main aim of current treatment, because long-term morbidity is partly due to treatment toxicity.^{[3, 4]} Complementary care should not add to this burden or interfere with medicines.

Kidney health

The kidneys are the organ most often affected, and long-term kidney disease is a recognized outcome.^{[1, 3]} This matters for herbs, since some herbal products can harm the kidneys.^[6]

Fatigue and sleep

Fatigue is common in vasculitis and other chronic illnesses, and sleep problems add to it. Supportive approaches target these symptoms rather than the disease. In chronic kidney disease, a Cochrane review found very low quality evidence that acupressure reduced fatigue, depression and poor sleep in people on hemodialysis.^[7]

Nerve symptoms and pain

Peripheral nerves are often affected, and numbness, tingling and pain can persist.^[3] Nerve and joint pain are symptoms that supportive care may be asked to help with, but a physician needs to evaluate any new nerve symptom first.

Acupuncture as supportive care in Microscopic Polyangiitis

What the research shows

No clinical trials of acupuncture for MPA or other ANCA-associated vasculitis were found in PubMed. Acupuncture cannot be said to treat this disease or to affect the vessel inflammation.

Some research addresses symptoms in related settings. A Cochrane review of 24 studies in chronic kidney disease (1,787 participants) found very low quality evidence that manual acupressure helped fatigue, depression and sleep in people on hemodialysis. It found little evidence about other forms of acupuncture or about pain, and it could not judge safety because harms were poorly reported.^[7] A meta-analysis of 24 trials in insomnia found acupuncture improved sleep scores compared with medication, mostly after about three weeks, with large differences between studies.^[8] These results are for other populations and may not apply to people with MPA.

How acupuncture may work

There is no research on how acupuncture might act in vasculitis, so we cannot offer a mechanism for this disease.

What treatment involves

Sessions use fine, sterile, single-use needles, usually left in for about 20 to 40 minutes, with a short course of visits followed by reassessment.

In prospective studies, about 9 in 100 patients had a minor reaction such as soreness or bleeding at a needle site, and serious events occurred in about 1 in 10,000 patients.^[9] Because MPA treatment lowers immune defenses, tell the practitioner first if you take glucocorticoids, rituximab, cyclophosphamide or other immunosuppressants, have skin ulcers or purpura, a low platelet count, a bleeding disorder, take blood thinners, are pregnant, or have a pacemaker (relevant to electroacupuncture).

Ayurvedic medicine as supportive care in Microscopic Polyangiitis

The Ayurvedic view

Ayurveda has no classical name for MPA. Inflammatory conditions of the blood vessels and skin are traditionally discussed in terms of Pitta and Rakta (blood) imbalance, and weakness or fatigue in terms of reduced strength (ojas). These are traditional frameworks, not medical diagnoses.

Therapies that may be used

Care is individual and, in this setting, would stay gentle: diet and daily routine advice, rest, stress-reduction practices such as breathing exercises, and mild oil massage if the skin is intact.

Panchakarma is not appropriate during pregnancy, acute illness or frailty. It is not suitable for MPA, because the disease is serious, treated with strong immune-suppressing drugs, and often involves the kidneys.

What the research shows

No studies of Ayurvedic treatment for MPA or other vasculitis were found, so the evidence is none. Ayurvedic herbs have not been tested in this disease.

Safety is a concern. One study found detectable lead, mercury or arsenic in about one fifth of Ayurvedic medicines bought online.^[10] Heavy metals are harmful to the kidneys, a major concern in MPA. Ayurvedic herbs may also interact with prescribed medicines, as other herbs do.^[11]

Herbal medicine as supportive care in Microscopic Polyangiitis

Herbs and formulas that have been studied

No herbs or formulas have been tested in MPA. Chinese herbs such as Astragalus (huang qi) have been studied in chronic kidney disease in general.^[12]

What the research shows

A Cochrane review of 22 studies (1,323 people) of Astragalus in chronic kidney disease found possible reductions in protein in the urine and increases in hemoglobin and albumin, but the study quality was low and reporting was poor, so no firm conclusions could be drawn. Most trials did not report side effects.^[12] These findings are for chronic kidney disease, not for MPA, and cannot be taken to show benefit in vasculitis.

Safety and herb-drug interactions

Herbs are a particular concern in MPA. Certain Chinese herbal medicines contain aristolochic acid, a plant toxin linked to kidney failure and urinary tract cancer.^[6] Herbs and supplements are also a recognized cause of liver injury.^[13]

Herbs can interact with the medicines used for MPA. Reviews describe interactions with immune-suppressing drugs such as ciclosporin and tacrolimus, and bleeding with warfarin.^{[11, 14, 15]} Any herb should be reviewed by your rheumatologist or kidney specialist, come from a tested source, and be prescribed individually. Tell us about pregnancy, breastfeeding, and liver or kidney disease.

Translating traditional medicine into modern biological language

This section is interpretation, not equivalence. Chinese medicine would describe a vasculitis with fever, rash and bleeding as heat in the blood and blood stasis, and Ayurveda as aggravated Pitta with blood involvement. Biomedical researchers describe ANCA-driven neutrophil activation, complement activation and inflammation of small vessel walls.^[3]

These descriptions are not equivalent, and no study has shown that a traditional pattern matches the biology of MPA or that herbs act on it.

How this care fits with your medical care

MPA needs specialist treatment, often started in a hospital. For a condition like this, we ask that you are under a physician's care for it and that your treating team knows you are receiving complementary care. Our role is supportive. We do not diagnose or manage MPA, order or interpret its tests, or prescribe or change prescription drugs.

Do not stop or change prescribed medicines, including glucocorticoids, which should not be stopped suddenly. Please bring your diagnosis, recent kidney and ANCA test results, a full list of medicines and supplements, and the names of your rheumatologist and kidney specialist.

When to seek urgent medical care

MPA can damage the kidneys and lungs quickly.^{[1, 3]}

• Coughing up blood, or new shortness of breath
• Blood in the urine, much less urine than usual, or new swelling of the legs or face
• Fever, especially while taking immune-suppressing medicine
• Sudden weakness, numbness or foot or wrist drop
• Chest pain, severe abdominal pain, or a new spreading rash or skin ulcers
• Sudden vision changes or severe headache

If you have any of these, call 911 or go to the nearest emergency department.