What exactly happens in the body when someone has lupus?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Lupus is a chronic autoimmune disease in which the immune system mistakenly attacks healthy tissues, triggering inflammation and damage across multiple organs, including the skin, joints, kidneys, heart, and brain. Common symptoms include fatigue, joint pain, skin rashes (often a butterfly-shaped rash across the cheeks), fever, and hair loss. Because lupus symptoms overlap with many other conditions, it can be difficult to diagnose without proper evaluation.

If you're experiencing symptoms that could point to lupus or another autoimmune condition, understanding what's happening in your body is the critical first step. A free, instant, online symptom check can help you identify possible causes, clarify which specialist to see, and guide your next steps—all in just a few minutes. Early insight leads to earlier answers, so don't wait to take control of your health.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if lupus symptoms need care today Discover likely causes of lupus symptoms See if it could be lupus Find OTC relief for lupus symptoms Find a lupus specialist near you Discover medically valid home remedies for lupus Understand if symptoms suggest lupus flareup

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Explanation

Lupus, or systemic lupus erythematosus (SLE), is a disease where the immune system, which usually fights germs, starts attacking the body's own cells. This can cause inflammation and harm to many parts of the body like the skin, joints, kidneys, and heart.

How Lupus Affects the Body:

Immune System Confusion: In lupus, the immune system gets confused and thinks the body's own cells are invaders.
Antibody Production: The body makes special proteins called antibodies that attack its own tissues.
Inflammation: This attack causes swelling, redness, and pain in the affected areas.
Organ Damage: Over time, this can lead to damage in organs like the kidneys, skin, and heart.

Why Does This Happen?

Genetic Factors: Some people have genes that make them more likely to get lupus.
Environmental Triggers: Things like sunlight, infections, or stress can trigger lupus in people who are at risk.

Lupus is a complex disease, and its symptoms can vary widely. If you're experiencing unusual symptoms like joint pain, fatigue, or unexplained rashes, you can check your symptoms with our free AI-powered tool and get personalized health insights to discuss with your doctor.

(References)

Contin-Bordes C, Lazaro E, Pellegrin JL, Viallard JF, Moreau JF, & Blanco P. (2009). Systemic lupus erythematosus: from pathophysiology to .... La Revue de medecine interne, 19995652.
Moulton VR, Suarez-Fueyo A, Meidan E, Li H, Mizui M, & Tsokos GC. (2017). Pathogenesis of Human Systemic Lupus Erythematosus. Trends in molecular medicine, 28623084.
Crow MK. (2023). Pathogenesis of systemic lupus erythematosus: risks, .... Annals of the rheumatic diseases, 36792346.

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