# Autoimmune Disease: Understanding When the Immune System Attacks Itself

**By VitalPath Editorial | June 27, 2026**

**Meta Description:** Autoimmune diseases affect 50 million Americans and are rising in prevalence. Learn about the most common autoimmune conditions, their symptoms, risk factors, and current treatment approaches.

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## Introduction
Autoimmune diseases occur when the immune system mistakenly attacks the body’s own tissues. More than 80 autoimmune diseases have been identified, collectively affecting approximately 50 million Americans—roughly 1 in 6 people. They are among the most common chronic diseases and a leading cause of morbidity, particularly in women, who account for 75% of autoimmune disease cases.

## What Causes Autoimmune Disease?
The development of autoimmunity requires a combination of genetic predisposition and environmental triggers. Having susceptibility genes is necessary but not sufficient—most people with genetic risk never develop disease. Environmental triggers include infections (Epstein-Barr virus and multiple sclerosis, Streptococcus and rheumatic fever), smoking (strongest environmental risk factor for rheumatoid arthritis), dietary factors (gluten in genetically susceptible individuals for celiac disease), and possibly gut microbiome alterations.

## Common Autoimmune Diseases
– **Rheumatoid Arthritis:** Joint inflammation and destruction. Affects 1.3 million Americans. Treated with disease-modifying antirheumatic drugs (DMARDs), biologics, and targeted synthetic DMARDs.
– **Systemic Lupus Erythematosus:** Multi-system inflammation affecting skin, joints, kidneys, brain, and other organs. Characteristic butterfly rash. Treated with hydroxychloroquine, corticosteroids, immunosuppressants, and biologics (belimumab).
– **Multiple Sclerosis:** Immune attack on myelin sheaths of nerve fibers. Affects 1 million Americans. Treated with disease-modifying therapies that reduce relapse rate and slow progression.
– **Type 1 Diabetes:** Autoimmune destruction of pancreatic beta cells, causing insulin deficiency. Requires lifelong insulin therapy.
– **Hashimoto’s Thyroiditis:** Autoimmune attack on the thyroid gland, the most common cause of hypothyroidism. Treated with levothyroxine.
– **Inflammatory Bowel Disease:** Crohn’s disease and ulcerative colitis. Treated with aminosalicylates, immunomodulators, biologics, and small molecule therapies.
– **Psoriasis/Psoriatic Arthritis:** Skin and joint inflammation. Treated with topicals, phototherapy, DMARDs, and biologics.
– **Celiac Disease:** Immune reaction to gluten causing intestinal damage. Treated with strict gluten-free diet.

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