United Kingdom, Dec. 11 -- Lili Reinhart has been diagnosed with endometriosis.

The 29-year-old actress has revealed via social media that she's been diagnosed with the condition, in which cells similar to the lining of the uterus, or endometrium, grow outside the uterus.

Lili wrote on Instagram: "Last week, I was officially diagnosed with endometriosis following laparoscopic surgery.

"Last year, I saw a urogynecologist and was diagnosed with interstitial cystitis. I was told there was no cure-and no lasting relief-for my symptoms. Three hospital visits. Multiple urologists and gynecologists. And not one of them seriously considered endometriosis as the underlying cause of what I was experiencing.

"It wasn't until I worked with two di...