More severe symptoms include depression, lung disease, heart problems and kidney inflammation.The singer hasn't made as many public appearances this summer as she has recovered from her transplant.
She revealed she had a kidney transplant on Instagram Thursday.
And on Friday, Selena Gomez was spotted leaving her New York City apartment with her boyfriend The Weeknd.
She's also been praised by fund-raisers for helping to bring in half a million dollars for Lupus Research, by inspiring people to donate to the cause.'Selena's openness and strong emotional connection to her worldwide audience has brought extraordinary awareness to a disease that is typically overlooked,' the CEO of charity Lupus Research Alliance Kenneth Farber explained to E! He added: 'As a result of her encouragement to visit our website, Lupus Research.org, to learn about lupus, our phones have been ringing off the hook and our website traffic has soared.
'Selena has supported our organization in many ways, donating a portion of tickets sales for her last concert tour to the Lupus Research Alliance and requesting donations to us on the occasion of her birthday, as well as yesterday's announcement.
Kidney transplants are necessary for people with lupus if the organ begins to fail because of the immune system attacking it Lupus, or systemic lupus erythematosus (SLE), is a chronic illness where the body's immune system attacks its own antibodies even if they are healthy.
It is known as an 'autoimmune' disease because the immune system is attacking healthy tissue and organs instead of ones that are infected.Doctors have to monitor transplant patients closely to make sure the organ isn't rejected.This is her during the Coach In-Store event during New York Fashion Week Researchers from the Ohio State University found that exercise can help lower the person's need for a kidney transplant.The Weeknd, born Abel Tesfaye, was spotted leaving her apartment in a colorful ensemble soon after.Selena needed a kidney transplant due to lupus, an autoimmune disease; her best friend Francia Raisa donated her kidney to her.About five million people worldwide have lupus and 90 percent of those people are women. Some might experience symptoms slowly such as tiredness or joint aches while others will have severe problems right away.