Hailey Bieber has opened up to her followers on Instagram, telling them she has an ovarian cyst 'the size of an apple'.
Hailey, 26, shared a photo of her stomach, explaining to followers that she's not pregnant, but instead is struggling with an ovarian cyst.
"I have a cyst on my ovary the size of an apple," she said. "I don't have endometriosis or PCOS [polycystic ovary syndrome] but I have gotten an ovarian cyst a few times and it's never fun.
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"It's painful and achey and makes me feel nauseous and bloated and crampy and emotional.
"Anyways... I'm sure a lot of you can overly relate and understand. We got this."
An ovarian cyst is a fluid-filled sac that develops on an ovary. The NHS explains that they're 'very common' and often don't cause symptoms, with many going away on their own.
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They're usually detected during an ultrasound scan and there are two types - functional ovarian cysts and pathological ovarian cysts.
Functional cysts are linked to the menstrual cycle. Sometimes, if a follicle does not release an egg, or does not shrink after an egg is released, it can swell and become a cyst.
They are non-cancerous (benign) and are usually harmless, although they can sometimes cause symptoms.
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Meanwhile, pathological cysts are caused by abnormal cell growth. They are usually non-cancerous, but a small number are cancerous and are often removed via surgery.
Earlier this year, Hailey - who is married to singer Justin Bieber - opened up on another health issue after she revealed she had suffered from a mini stroke.
In a video, the model explained how she began feeling a 'weird sensation' in her arm before feeling numbness in her fingertips.
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"The right side of my face started drooping, I couldn't get a sentence out," she said.
Husband Justin noticed something was wrong and immediately instructed someone to call 911. A medic came to examine Hailey and although she couldn't communicate, she said she felt she was 'having a stroke'.
The hospital confirmed that she had suffered a Transient Ischemic Attack (TIA) - also known as a mini stroke.
A TIA is caused by a temporary disruption in the blood supply to part of the brain.
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"They did some scans and were able to see that I had suffered a small blood clot to my brain," Hailey continued, explaining that she was told by doctors that the combination of her new birth control, a recent battle with covid and travelling 'from Paris and back in a really short amount of time' could have contributed to the clot.
You can read more about what happened here.
Lucy Devine