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Systemic Lupus Erythematosus (SLE), commonly just called Lupus, is a chronic autoimmune disease. It occurs when your immune system loses the ability to tell the difference between foreign invaders and your own healthy tissue, leading it to create antibodies that attack and destroy healthy organs and tissues.
The "Great Imitator": Lupus is notoriously difficult to diagnose because its signs and symptoms often perfectly mimic those of other ailments, like thyroid problems, Lyme disease, or fibromyalgia.
Signs & Symptoms: Flares and Remission
No two cases of lupus are exactly alike. Symptoms can come on suddenly or develop slowly, be mild or severe, and may be temporary or permanent. Most people with lupus have mild disease characterized by episodes—called flares—when signs and symptoms get worse for a while, then improve or even disappear completely (remission).
The most iconic sign of lupus is a facial rash that resembles the wings of a butterfly unfolding across both cheeks (Malar rash). However, not everyone gets this. Other symptoms depend on which body systems are under attack:
| System Affected | Symptoms & Complications |
|---|---|
| Joints & Muscles | Severe joint pain, stiffness, and swelling. Profound, unexplained fatigue. |
| Skin & Hair | The "butterfly rash," skin lesions that worsen with sun exposure (photosensitivity), and unexplained hair loss. |
| Kidneys | Lupus nephritis (kidney damage). Often silent at first, but can cause generalized itching, chest pain, nausea, and leg swelling. It is one of the leading causes of death among people with lupus. |
| Brain & Nervous System | Headaches, dizziness, behavior changes, vision problems, and even strokes or seizures. Often described as "lupus fog" (memory and cognitive issues). |
For many people with lupus, ultraviolet (UV) light is a massive trigger. A single day at the beach without extreme protection can cause a severe skin rash and trigger a full-body internal flare-up of the disease.
Causes & Risk Factors
Lupus is likely caused by a complex combination of your genetics and your environment. People with an inherited predisposition for lupus may develop the disease when they come into contact with something in the environment that can trigger it (like sunlight, infections, or certain blood pressure medications).
- Sex: Lupus is overwhelmingly a women's disease (9 out of 10 people diagnosed are female).
- Age: Symptoms usually emerge between the ages of 15 and 45.
- Race: In the United States, lupus is more common—and often more severe—in African Americans, Hispanics, and Asian Americans than in Caucasians.
Diagnosis & Modern Treatments
Because there is no single test for lupus, a rheumatologist will use a combination of blood tests (specifically looking for Antinuclear Antibodies, or ANA), urine tests (to check kidney function), and a review of your medical history to make a diagnosis.
Treatment: Controlling the Immune System
While there is no cure, aggressive treatment can prevent organ damage and manage flares.
- Antimalarial Drugs: Medications like Hydroxychloroquine (Plaquenil), originally used to treat malaria, are highly effective at controlling lupus flares and skin rashes.
- Corticosteroids: Drugs like Prednisone are used to quickly counter inflammation during a severe flare, though long-term use has significant side effects.
- Immunosuppressants: Drugs that actively suppress the immune system (like Methotrexate or Azathioprine) are used in severe cases to stop the body from attacking major organs like the kidneys.
- Biologics: Newer IV medications (like Belimumab) target specific immune system proteins to reduce the body's autoimmune response.
Reviewed & Sources: WHO, CDC, medical textbooks
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