Yolanda Foster is not letting a certain Real Housewives of Beverly Hills star's comments about her health get to her. According to E! News, the reality star and mother of models Gigi Hadid and Bella Hadid has been battling chronic Lyme disease for years. On Tuesday's episode of the Bravo series, co-star Lisa Rinna appeared to question the validity of her ailment when she read to cast members Kyle Richards and Lisa Vanderpump a definition of Munchausen syndrome. The syndrome is a mental disorder in people "feign disease, illness, or psychological trauma to draw attention, sympathy, or reassurance to themselves." In her Bravo blog, Foster struck back at Rinna, writing "I will move on from the absurd Munchausen comment that is an insult to my integrity and that of my two children who battle this disease on a daily basis."