Lili Reinhart is opening up about her health, revealing that she’s spent the last year dealing with an unknown chronic illness.

"I was inspired to talk about this after my grandmother was ignored by doctors for months when exhibiting clear symptoms of cancer — and it was only after her own strength and advocation for herself that she was given a blood test that diagnosed her.

The "Riverdale" alum has been diagnosed with interstitial cystitis following a series of inconclusive testing.