Top 10 Most Common Autoimmune Diseases Worldwide

Your immune system is supposed to be your bodyguard. But in millions of people, it gets confused and starts attacking the body it should protect. That’s the one thing the most common autoimmune diseases share, and they are far more widespread than most people realise.

How widespread? A 2023 study in The Lancet that tracked 22 million people found that about 1 in 10 people in the UK live with at least one autoimmune condition. Here’s which ones top the global list, backed by the latest numbers.

 In autoimmune disorders, the immune system mistakes healthy tissue for a threat and attacks it.

Key Highlights

• More than 80 autoimmune diseases are known; a 2025 US study counted 105 specific conditions.
• About 10.2% of people in the UK have at least one of the 19 most common types (The Lancet, 2023).
• Women are hit hardest: 63% of US patients with an autoimmune diagnosis are female (Journal of Clinical Investigation, 2025).
• Hashimoto’s thyroiditis is the most common worldwide, affecting about 7.5% of adults.
• Rheumatoid arthritis cases are forecast to climb from 17.6 million (2020) to 31.7 million by 2050.
• Type 1 diabetes affected an estimated 9.5 million people in 2025, up 13% since 2021.
• One in three patients (34%) has more than one autoimmune disease.
• The 2025 Nobel Prize in Medicine went to the discovery of regulatory T cells, the immune system’s “security guards.”

What Are Autoimmune Diseases?

An autoimmune disease happens when your immune system wrongly treats your own cells as invaders. It then produces antibodies and inflammation that damage healthy tissue.

The target changes from disease to disease. It might be the thyroid, the skin, the joints, the gut or the brain. That’s why two people with “autoimmune disease” can have completely different lives.

Most are chronic. They can be managed, often very well, but rarely cured outright. Genes load the gun, and triggers like infections, smoking, stress and hormones often pull the trigger.

How We Ranked the Most Common Autoimmune Diseases

There’s no single global register for autoimmune disorders. So we ranked each condition using the best available worldwide estimate: large meta-analyses, the Global Burden of Disease (GBD) study, WHO reports and official disease atlases.

One honest caveat. Numbers depend on how you count. Blood-test screening finds far more cases than doctors’ records do. For example, the 2025 US study using health records put rheumatoid arthritis first, because many thyroid and skin cases never get a formal autoimmune label.

The Top 10 Most Common Autoimmune Diseases Worldwide

1. Hashimoto’s Thyroiditis

Key detail: About 7.5% of adults worldwide (Frontiers in Public Health, 2022 meta-analysis of 48 studies)

Hashimoto’s slowly destroys the thyroid gland, causing an underactive thyroid. Think tiredness, weight gain, feeling cold and brain fog. Women are about four times more likely to get it than men. A daily thyroid hormone tablet usually keeps it well controlled.

2. Psoriasis

Key detail: Around 100 million people affected (WHO Global Report on Psoriasis)

Psoriasis speeds up skin cell growth, creating thick, scaly patches on elbows, knees and the scalp. It isn’t contagious, yet stigma is a real problem. WHO notes that between 1.3% and 34.7% of patients go on to develop psoriatic arthritis.

3. Vitiligo

Key detail: 0.5% to 2% of the world’s population (International Journal of Dermatology review)

In vitiligo, the immune system attacks pigment-making cells, leaving smooth white patches. It’s painless and harmless physically, but often heavy emotionally, especially on darker skin. It usually starts before age 30.

4. Celiac Disease

Key detail: 1.4% by blood test, 0.7% confirmed by biopsy (Clinical Gastroenterology and Hepatology, 2018)

Eating gluten triggers an attack on the small intestine. Symptoms range from bloating and diarrhoea to anaemia and no symptoms at all. Here’s the surprising part: most people with celiac disease don’t know they have it. A strict gluten-free diet is the only treatment.

 Global estimates for rheumatoid arthritis, type 1 diabetes, IBD, lupus and multiple sclerosis from the latest studies.

5. Graves’ Disease

Key detail: Causes 60% to 80% of all hyperthyroidism cases (NIH StatPearls)

Graves’ is Hashimoto’s opposite. Antibodies push the thyroid into overdrive, leading to weight loss, a racing heart, anxiety and sometimes bulging eyes. It’s most common between ages 20 and 50, mainly in women.

6. Rheumatoid Arthritis (RA)

Key detail: 17.6 million people in 2020, forecast to hit 31.7 million by 2050 (The Lancet Rheumatology, 2023)

RA inflames the lining of the joints, usually hands and feet on both sides of the body. Morning stiffness lasting over an hour is a classic sign. Early treatment matters a lot, because joint damage can start within the first two years.

7. Type 1 Diabetes

Key detail: 9.5 million people in 2025, with 513,000 new diagnoses that year (IDF Atlas / T1D Index, 2025)

The immune system wipes out insulin-making cells in the pancreas. Many think it’s a “childhood disease,” but the median age of people living with it is actually 36. Numbers are projected to reach 14.7 million by 2040.

8. Inflammatory Bowel Disease (Crohn’s and Ulcerative Colitis)

Key detail: 3.83 million cases and 375,140 new cases in 2021 (GBD 2021, American Journal of Gastroenterology)

IBD causes long-lasting gut inflammation, pain, diarrhoea and fatigue. Once seen mostly in Western countries, it’s now rising fast in newly industrialised nations, including China and India.

 Autoimmune disease in women is roughly twice as common as in men, according to UK and US data.

9. Lupus (Systemic Lupus Erythematosus)

Key detail: 3.41 million people worldwide, with about 89% being women (Annals of the Rheumatic Diseases, 2023)

Lupus can strike almost anywhere: skin, joints, kidneys, heart and brain. The butterfly-shaped facial rash is famous, but many patients never get it. That’s one reason lupus is often called “the great imitator.”

10. Multiple Sclerosis (MS)

Key detail: 2.9 million people, up from 2.3 million in 2013 (MS International Federation, Atlas of MS)

MS damages the protective coating around nerves in the brain and spinal cord. Vision problems, numbness and balance issues are common early signs. Modern disease-modifying drugs have changed the outlook dramatically.

Close runners-up: Sjögren’s disease, alopecia areata and ankylosing spondylitis.

Important Statistics Table

Disease	Latest Global Estimate	Source and Year
Hashimoto’s thyroiditis	~7.5% of adults	Frontiers in Public Health, 2022
Psoriasis	~100 million people	WHO, Global Report on Psoriasis
Vitiligo	0.5%–2% of people	Int. Journal of Dermatology, 2012
Celiac disease	1.4% (blood test), 0.7% (biopsy)	Clin. Gastroenterol. Hepatol., 2018
Graves’ disease	60%–80% of hyperthyroidism	NIH StatPearls
Rheumatoid arthritis	17.6 million	Lancet Rheumatology (GBD), 2023
Type 1 diabetes	9.5 million	IDF Atlas / T1D Index, 2025
IBD	3.83 million	GBD 2021 (Am J Gastroenterol, 2024)
Lupus (SLE)	3.41 million	Annals of the Rheumatic Diseases, 2023
Multiple sclerosis	2.9 million	Atlas of MS, MSIF

Comparison Table: How the 10 Diseases Differ

Disease	Main Target	Typical Onset	More Common In	Main Treatment
Hashimoto’s	Thyroid	30s–50s	Women (~4x)	Thyroid hormone
Psoriasis	Skin, nails, joints	Teens–30s	Both sexes	Creams, light therapy, biologics
Vitiligo	Skin pigment	Before 30	Both sexes	Topical creams, light therapy
Celiac	Small intestine	Any age	Women, children	Gluten-free diet
Graves’	Thyroid, eyes	20–50	Women	Antithyroid drugs, radioiodine, surgery
Rheumatoid arthritis	Joints	30s–60s	Women	DMARDs, biologics
Type 1 diabetes	Pancreas	Childhood, but any age	Both sexes	Insulin
IBD	Gut	15–35	Both sexes	Anti-inflammatories, biologics, surgery
Lupus	Many organs	15–45	Women (~9x)	Antimalarials, immunosuppressants
Multiple sclerosis	Brain, spinal cord	20–40	Women	Disease-modifying therapies

Step-by-Step: What to Do If You Suspect an Autoimmune Disease

Autoimmune symptoms are vague, so diagnosis often takes years. These steps can speed it up.

1. Track your symptoms. Note fatigue, joint pain, rashes, gut problems or numbness, with dates and photos.
2. Check your family history. Autoimmune diseases cluster in families, often as different conditions.
3. See your primary doctor. Bring your notes and ask directly whether an autoimmune cause is possible.
4. Ask about the right blood tests. Common ones include ANA, thyroid antibodies, tTG-IgA for celiac, and RF or anti-CCP for RA.
5. Get a specialist referral. That might be a rheumatologist, endocrinologist, gastroenterologist, dermatologist or neurologist.
6. Build a long-term plan. Ask about medicines, diet, exercise and how often to monitor.

Pros and Cons of Today’s Main Treatments

Treatment Type	Pros	Cons
Lifestyle changes (diet, exercise, quitting smoking)	Low cost, few side effects, helps overall health	Rarely enough alone, except celiac’s gluten-free diet
Hormone or insulin replacement	Very effective for thyroid disease and type 1 diabetes	Lifelong, needs regular monitoring
Conventional immunosuppressants and DMARDs	Proven, affordable, widely available	Higher infection risk, side effects
Biologics and targeted drugs	Precise, can stop joint and organ damage	Expensive, injections or infusions, infection risk
Cell therapies (CAR-T, islet cells)	Potential for long, drug-free remission	Still experimental, intensive, limited access

2026 Trends and Latest News

The Nobel spotlight. The 2025 Nobel Prize in Physiology or Medicine went to Mary Brunkow, Fred Ramsdell and Shimon Sakaguchi for discovering regulatory T cells, the cells that stop immune attacks on our own body. Treg-boosting therapies are now being tested in autoimmune disease.

CAR-T moves beyond cancer. At ACR Convergence 2025, researchers showed early CAR-T results in lupus and other autoimmune conditions. A 2026 review in Nature Reviews Drug Discovery reports that some lupus patients reached remission and stopped their previous medicines.

A type 1 diabetes setback, for now. Vertex’s stem cell islet therapy, zimislecel, had 10 of 12 early patients off insulin. But in January 2026, the company paused completion of dosing in its pivotal trial pending a manufacturing analysis. Watch this space.

Cases keep climbing. The UK Lancet study found celiac disease and Graves’ disease incidence roughly doubled over two decades. The US now has a dedicated NIH Office of Autoimmune Disease Research.

 Early warning signs of autoimmune disorders include long-lasting fatigue, joint pain, rashes and digestive issues.

Conclusion

The most common autoimmune diseases, from Hashimoto’s to multiple sclerosis, touch hundreds of millions of lives, and women carry most of that weight. The good news? Earlier testing, smarter drugs and cell therapies are changing what living with them looks like. If something feels off for weeks, push for answers early.

This article is for general information only and is not medical advice. Please talk to a qualified doctor about your symptoms.

References

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9. GBD 2021 Rheumatoid Arthritis Collaborators. The Lancet Rheumatology, 2023. https://doi.org/10.1016/S2665-9913(23)00211-4
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13. MS International Federation. Atlas of MS. https://www.msif.org/news/2023/08/21/new-prevalence-and-incidence-data-now-available-in-the-atlas-of-ms/
14. AABB. “Trio Wins 2025 Nobel Prize in Medicine for Contributions to the Discovery of Regulatory T Cells.” 2025. https://www.aabb.org/news-resources/news/article/2025/10/06/trio-wins-2025-nobel-prize-in-medicine-for-contributions-to-the-discovery-of-regulatory-t-cells
15. American College of Rheumatology. “CAR-T Cell Therapies Show Promise for Autoimmune Disease at ACR Convergence 2025.” https://rheumatology.org/press-releases/car-t-cell-therapies-show-promise-for-autoimmune-disease-at-acr-convergence-2025/
16. Avouac J, et al. “Roads and detours for CAR T cell therapy in autoimmune diseases.” Nature Reviews Drug Discovery, 2026. https://doi.org/10.1038/s41573-025-01349-4
17. Vertex Pharmaceuticals. “Vertex Provides Pipeline and Business Updates in Advance of Upcoming Investor Meetings.” January 11, 2026. https://news.vrtx.com/node/34151

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