Lupus is an autoimmune disease that can attack the skin, joints, organs, nervous system, blood cells, kidneys, or some combination of body systems. Most cases strike women, although lupus can occur in men, too.

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11 Symptoms Used to Diagnose Lupus

Lupus can be tricky to diagnose, so consult a doctor if you think you might have lupus symptoms.
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More on Lupus

9 Celebrities With Lupus

Check out this list of celebrities (and one celebrity dog) who have been diagnosed with lupus.
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7 People on What It's Really Like to Have Lupus

After Selena Gomez' big announcement, we asked several people living with lupus to share what it's really like, what they wish people knew about this disease, and how they push forward. Here are their stories.
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Selena Gomez's BFF Francia Raisa Proudly Shows Off Her Scar in Stunning Look at PEOPLE's Ones to Watch Party

The actress recently donated her kidney to Gomez, who has the autoimmune disease lupus.