Selena Gomez Had a Secret Kidney Transplant to Deal With Lupus

Instagram/Selena Gomez

Now we finally know why Selena Gomez kept things pretty low-key and wasn’t doing much to promote her new this summer.

On Thursday, she took to Instagram to share a personal note and images about why she dipped out of the spotlight.

MORE: Selena Gomez Doesn’t Want to Discuss Her Battle With Lupus

Selena, 25, had a secret kidney transplant related to her lupus diagnosis and needed time to recover from the surgery.

In 2015, Selena announced that she has lupus, an autoimmune disease which attacks healthy tissues and can affect the skin, heart, lungs, kidneys, and blood cells. A year later, she canceled her highly anticipated Revival Tour to deal with depression, panic attacks, anxiety, all of which are considered side effects of the disease.

Selena, who has been about her honest about her health challenges, thanked her family and a team of doctors for their pre- and post-surgery efforts. The "Fetish" singer reserved a special tribute for her bestie Francia Raisa for offering her the “ultimate gift” by donating her kidney, saying: “I am incredibly blessed. I love you so much, sis. Lupus continues to be very misunderstood, but progress is being made.”

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According to the Lupus Foundation of America, about 1.5 million people in the U.S. have lupus, and more 90 percent of them are women.

Read the heartfelt caption in Selena’s own words below.

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I’m very aware some of my fans had noticed I was laying low for part of the summer and questioning why I wasn’t promoting my new music, which I was extremely proud of. So I found out I needed to get a kidney transplant due to my Lupus and was recovering. It was what I needed to do for my overall health. I honestly look forward to sharing with you, soon my journey through these past several months as I have always wanted to do with you. Until then I want to publicly thank my family and incredible team of doctors for everything they have done for me prior to and post-surgery. And finally, there aren’t words to describe how I can possibly thank my beautiful friend Francia Raisa. She gave me the ultimate gift and sacrifice by donating her kidney to me. I am incredibly blessed. I love you so much sis. Lupus continues to be very misunderstood but progress is being made. For more information regarding Lupus please go to the Lupus Research Alliance website: -by grace through faith

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