What is Systemic Lupus Erythematosus (SLE)?
Lupus is an autoimmune disease in which the immune system attacks the body's own tissues. It can affect the skin, joints, kidneys, blood cells, lungs, heart and nervous system, and it typically runs in flares separated by quieter periods. With modern treatment most patients achieve low disease activity and a normal life expectancy.
Also called: Lupus, SLE
Who gets Systemic Lupus Erythematosus (SLE)?
Lupus affects women about nine times more often than men, and usually begins between the ages of 15 and 45. It is more common and often more severe in South Asian, African and East Asian populations than in white European populations, and kidney involvement in particular is more frequent in Indian patients. Family history raises the risk. Sunlight, some infections, certain medicines and pregnancy can trigger the onset or a flare.
What are the symptoms of Systemic Lupus Erythematosus (SLE)?
Not everyone has every symptom below, and having one does not confirm the diagnosis. These are the features that most often lead to assessment:
- Profound fatigue that rest does not relieve
- Joint pain and swelling, often in the hands and wrists, usually without joint destruction
- A rash across the cheeks and nose that spares the folds beside the nose, or raised scaly patches elsewhere
- Rash or general worsening after sun exposure
- Painless ulcers in the mouth or nose
- Hair thinning or patchy loss
- Fingers turning white or blue in the cold
- Fever with no infection
- Foamy urine, blood in the urine, or swelling of the legs and around the eyes
- Chest pain that is worse on deep breathing
- Headache, seizures, confusion or mood change where the nervous system is involved
- Repeated miscarriage or blood clots
How is Systemic Lupus Erythematosus (SLE) diagnosed?
Lupus is diagnosed on a combination of features rather than a single test, and the process is as much about excluding other explanations as confirming this one.
ANA is positive in almost everyone with lupus, which makes a negative ANA useful for ruling it out — but a positive ANA on its own means very little, because it is also found in a substantial proportion of healthy people. The specific antibodies matter more: anti-dsDNA and anti-Sm are highly specific for lupus, and anti-dsDNA levels often track disease activity.
Complement levels (C3 and C4) fall during active disease. Blood counts may show low white cells, low lymphocytes or low platelets. Urine testing for protein and blood is done at every visit, because kidney involvement is often completely silent until it is advanced.
Antiphospholipid antibodies are checked, as they change the risk of clotting and pregnancy complications.
How is Systemic Lupus Erythematosus (SLE) treated?
Hydroxychloroquine is given to essentially every patient with lupus and continued long-term. It reduces flares, protects the kidneys, improves survival and is safe in pregnancy; annual eye checks are recommended after five years.
Corticosteroids control active disease quickly, and the aim is always to reduce them to the lowest effective dose, since long-term steroid exposure causes much of the damage attributed to lupus itself.
Steroid-sparing immunosuppression — mycophenolate, azathioprine, methotrexate — is chosen according to which organs are involved. Kidney and severe organ disease may need cyclophosphamide or a biologic such as belimumab or rituximab.
Sun protection is genuine treatment, not advice: ultraviolet light triggers both skin and systemic flares. Vitamin D, blood pressure control and cardiovascular risk management are part of routine care.
Living with Systemic Lupus Erythematosus (SLE)
Lupus is a long-term condition managed in partnership over decades. Regular monitoring continues even when you feel well, because kidney involvement can develop silently. Pregnancy is usually possible and usually successful, but it should be planned during a period of stable disease and on medicines compatible with pregnancy. Cardiovascular risk is raised, so blood pressure, cholesterol and smoking are addressed actively. Fatigue is often the most limiting symptom and the least visible to others.
When should you see a rheumatologist?
Unexplained fatigue with joint pain, a rash that worsens in sunlight, mouth ulcers, hair loss or a positive ANA test should be assessed by a rheumatologist. New foamy urine, leg swelling, chest pain, severe headache or confusion in someone with lupus needs urgent assessment.
Common questions about Systemic Lupus Erythematosus (SLE)
Is lupus fatal?
Not with modern treatment. Survival has improved dramatically over the last four decades, and most patients diagnosed and monitored properly have a normal or near-normal life expectancy. The main risks come from untreated kidney disease, severe infection and long-term cardiovascular damage, all of which are actively managed.
Can I have children if I have lupus?
Yes, in most cases. Pregnancy is planned for a period when the disease has been stable for at least six months, on medicines compatible with pregnancy. Hydroxychloroquine is continued throughout. Antiphospholipid antibodies and anti-Ro antibodies are checked because they change the monitoring plan.
Does a positive ANA mean I have lupus?
Usually not. A positive ANA occurs in many healthy people, particularly women and with increasing age, and in thyroid disease and after infections. It is meaningful only alongside symptoms and specific follow-on antibodies such as anti-dsDNA and anti-Sm.
Will I need steroids forever?
The aim is the opposite. Steroids control a flare quickly, then a steroid-sparing medicine takes over so the dose can be reduced to the minimum, and often stopped. Long-term high-dose steroid use causes much of the damage historically blamed on lupus itself.
Does sunlight really make lupus worse?
Yes, and not only the skin. Ultraviolet exposure can trigger systemic flares including joint pain and fatigue. Daily broad-spectrum sunscreen, hats and shade are part of treatment rather than general advice.
Is lupus hereditary?
There is an inherited predisposition, but it is not directly inherited. Having a close relative with lupus raises the risk several-fold from a low baseline. Most people with lupus have no affected relative.
This page is general information to support a consultation. It is not a diagnosis, and it does not replace an assessment by a doctor who has examined you.