Following Tina Turner's death on May 24 at age 83, it was reported that the legendary singer had died of natural causes.
The "Queen of Rock 'n' Roll" had struggled with several health issues, however, including long-term kidney disease.
As recently as March 9, on World Kidney Day, Turner announced her support of an international campaign for kidney health via Instagram.
Turner shared in the post how her failure to seek treatment had harmed her health and endangered her life.
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"My kidneys are victims of my not realizing that my high blood pressure should have been treated with conventional medicine," the singer wrote on Instagram.
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"I have put myself in great danger by refusing to face the reality that I need daily, lifelong therapy with medication. For far too long, I believed that my body was an untouchable and indestructible bastion."
Turner's battle with kidney issues began in 1978, when she was diagnosed with hypertension.
Not realizing the danger that her high blood pressure posed, she never made much of an effort to control it, as she wrote in a story posted on ShowYourKidneysLove.com, a kidney awareness website.
"In 1985, a doctor gave me a prescription for pills, of which I was supposed to take one a day, and that was it," she wrote. "I didn't give it any more thought."
It wasn't until 2009, when the "poorly controlled hypertension" caused the singer to suffer a stroke, that Turner started to understand the function and purpose of the kidneys.
"This is when I first learned that my kidneys didn't work that well anymore," Turner wrote. "They had already lost 35% of their function."
The singer continued taking blood pressure medication, but she believed it only made her feel worse.
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"With time, I developed a fatal dislike of these pills," she wrote. "I remembered relishing life before I started taking them and wished I could be as clear-headed and energetic as I used to be."
Eventually, Turner gave up the conventional medication in favor of homeopathic medicine - a decision that ultimately put her life in danger.
"I had not known that uncontrolled hypertension would worsen my renal disease and that I would kill my kidneys by giving up on controlling my blood pressure," Turner wrote in the online story. "I never would have replaced my medication (with) the homeopathic alternatives if I had an idea how much was at stake for me."
"Thanks to my naivety, I had ended up at the point where it was about life or death," she wrote.
By this time, Turner was suffering from signs of late-stage kidney disease, including fatigue, nausea and irritability.
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"The doctors made it very clear that the consequences of my decision were irreversible," the singer wrote. "My kidney function had reached its all-time low."
Turner's only option was to start dialysis, which is a treatment that removes excess fluid and waste from the blood when the kidneys cannot function properly.
"I realized that the struggle for healing is always also a struggle for accurate information," the singer wrote. "For example, I had not been aware that chronic kidney failure is called a 'silent killer' because symptoms do not become noticeable until 80% of renal tissue is lost."
In 2017, Turner received a life-saving kidney transplant from her husband, Erwin Bach, who she'd married in 2013 after they'd been together for 27 years - but the months after the surgery were riddled with challenges.
"From time to time, my body tried to reject the donor kidney, as it frequently happens after a transplantation," the singer explained. "Every so often, this required more hospital admissions."
Turner continued to suffer from nausea, dizziness and memory loss.
"I am on multiple prescriptions and take great care to follow my doctors' orders meticulously, for I know that I can trust them and their therapies," she wrote.
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Just two months after the Instagram post announcing her support of kidney health awareness and sharing her own story, Turner died in her Switzerland home.
Healthy kidneys have three key jobs, per the National Kidney Foundation (NKF). They remove waste products and excess fluid from the body, help to control blood pressure and play a role in producing red blood cells.
Kidney failure, also known as renal failure, occurs when 85-90% of the organs' function is gone and they can no longer work on their own. This causes extra fluid and toxic waste to build up in the body, which can cause life-threatening conditions.
The two primary causes are high blood pressure, as was the case for Turner, and diabetes. Certain diseases, injuries and inherited disorders can also result in kidney damage.
In most cases, people don't experience symptoms until they are already in renal failure.
Those include loss of appetite, fatigue, sleep problems, anemia, weakness, unexplained weight loss, itching, muscle cramps and swelling of the feet or ankles.
People in renal failure require continuous treatment to stay alive.
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The two options for treatment are dialysis and a kidney transplant.
"The dialysis treatments or transplanted kidneys will take over some of the work of your damaged kidneys and remove wastes and extra fluid from your body," NKF states on its website. "This will make many of your symptoms better."
Other treatments may include medications, dietary restrictions, regular exercise and restriction of salt intake.
More than one in seven, or 15% of U.S. adults, have chronic kidney disease, according to the Centers for Disease Control and Prevention (CDC).
As many as nine in 10 adults with chronic kidney disease are not aware that they have it.
People 65 years of age and older are at higher risk of the disease, making up 38% of the cases, compared to 12% of those aged 45 to 64 and just 6% of those aged 18 to 44.