Lupus is not contagious and you cannot catch it from another person

Lupus develops when your immune system attacks your own tissues and organs instead of protecting you from infection. This happens because of a combination of factors — your genes, your hormones, and exposure to certain environmental triggers — not because of contact with someone who has lupus. You cannot get lupus from touching, living with, or being around someone who has it.

The disease appears to run in families, which means if a close relative has lupus, your risk is higher than the general population. But having a family history does not mean you will definitely develop it. Most people with a genetic predisposition to lupus never get the disease at all.

Key Takeaways

  • Lupus is an autoimmune disease caused by your own immune system, not an infection you can catch from someone else.
  • Genetics play a role — lupus runs in families — but having a relative with lupus does not may provide you will develop it.
  • Environmental triggers like sun exposure, infections, certain medications, and stress may activate lupus in people who are genetically predisposed.
  • Women are diagnosed with lupus far more often than men, suggesting hormones influence whether the disease develops.
  • Lupus typically appears in people between ages 15 and 45, though it can develop at any age.

How your genes and immune system create lupus

Lupus happens when your body produces antibodies that attack your own cells — a process called autoimmunity. Normally, your immune system makes antibodies to fight bacteria and viruses, then stops. In lupus, the immune system keeps making antibodies against your DNA, proteins in your cell nuclei, and other parts of your own body. These antibodies form complexes that deposit in your joints, skin, kidneys, and other organs, causing inflammation and damage.

Scientists have identified multiple genes that increase the risk of developing lupus. If you inherit certain combinations of these genes, your immune system is more likely to malfunction in this specific way. However, genes alone do not cause lupus — they only create the potential. Most people with lupus-related genes never develop the disease, which means something else has to trigger it.

Environmental and lifestyle factors that may trigger lupus

If you carry the genetic predisposition, certain exposures or events may activate lupus. Ultraviolet light from the sun is one of the most common triggers — sun exposure can cause a lupus flare or, in some cases, initiate the disease. Infections, particularly viral infections like Epstein-Barr virus, have been linked to lupus onset in people who are genetically vulnerable.

Certain medications can trigger a condition called drug-induced lupus, which resembles systemic lupus but usually improves when you stop taking the medication. Medications most often associated with this include hydralazine (used for high blood pressure), procainamide (a heart rhythm medication), and some antibiotics. Stress, hormonal changes, and smoking may also increase the risk or severity of lupus in susceptible people, though the exact mechanisms are still being studied.

Why lupus is far more common in women

About 90 percent of people diagnosed with lupus are women, and most are diagnosed between ages 15 and 45 — the reproductive years. This pattern strongly suggests that hormones, particularly estrogen, play a role in lupus development. Estrogen may amplify immune responses, making autoimmune reactions more likely in people who are genetically predisposed.

Lupus can flare during pregnancy, after childbirth, or when taking hormonal birth control or hormone replacement therapy. Men do develop lupus, but less frequently, and when they do, the disease is often more severe. This sex difference is one of the clearest clues that hormonal factors influence whether lupus develops and how it progresses.

Racial and ethnic patterns in lupus development

Lupus is diagnosed more often in Black, Hispanic, Asian, and Native American populations than in white populations. The reasons are not fully understood but likely involve both genetic and environmental factors. Some research suggests that genetic variants more common in these populations increase lupus risk, while other factors — such as differences in healthcare access, diagnosis rates, or environmental exposures — may also play a role.

If you belong to a population with higher lupus rates and have a family history of the disease, your personal risk is higher than average. This information matters for your own health awareness, though it does not change how lupus is diagnosed or treated.

What happens after lupus develops

Once lupus develops, it is a chronic condition that you will have for life. However, lupus is not progressive in the way some diseases are — it does not inevitably get worse over time. Instead, most people experience periods of remission (when symptoms are mild or absent) and flares (when symptoms worsen). The pattern and severity vary widely from person to person.

Early diagnosis and treatment can prevent organ damage and reduce flares. If you have symptoms that concern you — such as persistent joint pain, a butterfly-shaped rash across your cheeks, extreme fatigue, or chest pain — see a doctor for testing. A blood test for antinuclear antibodies (ANA) and other specific antibodies can help confirm lupus, though diagnosis usually requires a combination of blood tests, symptoms, and clinical findings.

Frequently Asked Questions

Can I get lupus from my mother if she has it?

Having a mother with lupus increases your genetic risk, but does not mean you will develop it. Most children of people with lupus do not get the disease. Your risk is higher than someone with no family history, but other factors — including your specific genes, hormones, and environmental exposures — also matter.

If I have lupus genes, will I definitely get lupus?

No. Many people carry genes associated with lupus but never develop the disease. Genes create susceptibility, but environmental triggers and other factors are needed for lupus to actually develop. You could carry the genes your entire life without ever experiencing lupus.

Can stress cause lupus?

Stress may trigger or worsen lupus in people who are genetically predisposed, but stress alone does not cause lupus in people without that predisposition. Stress is considered one of several possible triggers, not the primary cause. Managing stress is often part of lupus treatment, but it is not a substitute for medical care.

Does sun exposure cause lupus?

Sun exposure can trigger lupus flares in people who already have the disease, and may activate lupus in people who are genetically vulnerable. However, sun exposure alone does not cause lupus in people without genetic predisposition. If you have lupus or a family history of it, sun protection is important.

Can men get lupus?

Yes, men can develop lupus, though it is less common — about 10 percent of lupus cases occur in men. When men do develop lupus, the disease is often more severe and may involve more organ damage. Men with lupus are diagnosed at older ages on average than women.