Bella Hadid Posts Emotional Tribute to Her Mom's Battle with Lyme Disease

Bella Hadid wants her mom, Yolanda Hadid, to know that she’s proud of her “today, and everyday.”

On Tuesday, the 19-year-old model posted an emotional Instagram tribute to Yolanda, in honor of the Real Housewives of Beverly Hills star’s new book, Believe Me: My Battle with the Invisible Disability of Lyme Disease.

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"I am SO proud of my mom @yolanda.hadid today and everyday," wrote Bella. "This book marks such an incredible day for you. I have seen you in bed, struggling for the past 5 years of our lives, thinking to myself 'why would this happen to such an angel?' I would cry to myself knowing that there was nothing I could do to help and that there were people going against you and what you are/were going through."

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Bella, who also battles with lyme disease along with her younger brother, Anwar Hadid, revealed how the infectious disease has affected her life. "I have been struggling with Lyme and other co-infections for the past two years which has debilitated me from riding my horses, going to school, and struggling with work which are all the things I am so passionate about," she wrote, noting that her mother was "the only person that would believe me and understand what I was going through."

The teen closed out her touching Instagram post by congratulating her mom for penning a book that reminds "kids and adults" with lyme disease: "You are not alone and we believe you!"

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Watch Bella's older sister, Gigi Hadid, talk about the family's health battles in the video below.