- About 3.4 million people worldwide live with systemic lupus erythematosus, and around 400,000 are diagnosed each year (Annals of the Rheumatic Diseases, 2023).
- Women are affected about 9 times more often than men, most commonly between 15 and 45.
- The ANA test is positive in over 95% of lupus patients, but also in 10–15% of healthy people.
What an autoimmune disease is
The immune system is built to recognise and destroy what is foreign: viruses, bacteria, abnormal cells. In an autoimmune disease, this recognition fails and the body produces antibodies against its own tissues. Depending on the tissue targeted, different diseases arise: Hashimoto's thyroiditis, type 1 diabetes, rheumatoid arthritis or lupus.
Systemic lupus erythematosus is, in a sense, the autoimmune disease par excellence: it can affect the skin, joints, kidneys, blood, heart, lungs and nervous system. It is precisely this variety that makes it hard to diagnose, and the road to a rheumatologist often takes years.
The signs of lupus
No two lupus patients are alike. Still, a few signs, especially when they appear together, should raise suspicion.
- Deep fatigue that does not improve with rest
- Joint pain and swelling, usually in the hands and wrists, moving from joint to joint
- A red, butterfly-shaped rash across the cheeks and nose, worsened by the sun
- Marked sun sensitivity: rashes or feeling unwell after brief exposure
- Painless mouth ulcers, hair loss, fingers that turn white and blue in the cold (Raynaud's phenomenon)
- Unexplained fever, weight loss, chest pain on deep breathing, foamy urine or swollen legs
Tests in autoimmune diseases: how to read them
The ANA (antinuclear antibody) test is the entry point: a negative result makes lupus very unlikely, but a positive result does not mean disease. The titre (strength) and the staining pattern matter, and your doctor interprets them together with your symptoms.
If ANA is positive and there are clinical signs, specific antibodies follow: anti-double-stranded DNA and anti-Sm for lupus, anti-Ro/La for Sjögren's syndrome, anti-centromere or anti-Scl-70 for scleroderma. Serum complement (C3, C4) falls in active lupus. The blood count may show anaemia or low white cells and platelets, and a urine test is essential to detect kidney involvement early.
Treatment: controlling the disease, not just the symptoms
Hydroxychloroquine is recommended for almost all lupus patients: it reduces flares, protects the organs and improves long-term survival. Corticosteroids control inflammation quickly, but the aim is to use the lowest dose for the shortest time possible.
For forms with organ involvement, immunosuppressants (mycophenolate, azathioprine, methotrexate) and biologic therapies (belimumab, anifrolumab) are used. Regular monitoring with blood and urine tests, even when you feel well, is part of the treatment, because lupus can be active without obvious symptoms.
Living with an autoimmune disease
An autoimmune disease is a long-term condition, but with modern treatment most patients lead a normal life: they work, travel and have children. Daily sun protection (SPF 50), quitting smoking, regular sleep and managing stress reduce the frequency of flares.
Pregnancy is possible and usually safe when the disease has been stable for at least 6 months and is planned together with your rheumatologist. Recommended vaccinations and control of blood pressure and cholesterol are important, because cardiovascular risk is raised. Most importantly: do not stop your treatment on your own when you feel well.
When to see a doctor
- You have joint pain together with marked fatigue, sun-triggered rashes or unexplained fever
- You have a positive ANA test and symptoms that worry you
- You notice recurrent mouth ulcers, hair loss and fingers that turn white in the cold
- You have diagnosed lupus and develop foamy urine, swollen legs, chest pain or fever
Frequently asked questions
Is lupus contagious or hereditary?
It is not contagious. There is a genetic predisposition, and the risk is slightly higher if a close relative has lupus or another autoimmune disease, but most children of lupus patients do not develop it.
Can I be in the sun if I have lupus?
Yes, with precautions: SPF 50 cream applied daily, long sleeves and a hat, and avoiding 11 am to 4 pm in summer. Uncontrolled exposure can trigger not only rashes but a flare of the disease.
My ANA is positive but I feel fine. What should I do?
An isolated positive ANA at a low titre with no symptoms is common and usually needs no treatment. Your rheumatologist decides whether further tests are needed and, possibly, a review in 6–12 months.
Sources
- Tian J et al. – Global epidemiology of systemic lupus erythematosus: a comprehensive systematic analysis (Annals of the Rheumatic Diseases, 2023)
- NIAMS – Systemic Lupus Erythematosus (Lupus): Diagnosis, Treatment, and Steps to Take
- WHO – Musculoskeletal health (fact sheet, 2022)
The data presented come from public sources and published scientific studies; they describe populations, not individuals. A diagnosis is made only after a medical consultation. Laromed Clinic updates this page periodically as new data become available.
