Yolanda Foster's credibility is in question, as her The Real Housewives of Beverly Hills co-stars wonder whether she's exaggerating her 2012 Lyme disease diagnosis.

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In a preview clip for The Real Housewives of Beverly Hills' sixth season, Kyle Richards and other cast members were shown doubting the severity of Foster's condition, which she's actively discussed in the media for years in addition to promoting awareness.

"They like to prey on the weak. You're sick, so let's go after you," friend Brandi Glanville told Foster, 51, in the trailer.

"You have some balls, tell me you said it!" Foster demanded in another scene.

The show's stars went as far as to suggest Munchausen syndrome might be in play -- a disorder that results in an individual falsely believing he or she has a disease, illness or psychological trauma.

"A lot of the things she's gone through and the treatments she's done, for some of the cast members they were questioning exactly what she was doing and exactly how sick she was," Richards said during a recent interview with Entertainment Tonight.

"It was not a good situation. Some things came up that made some of the Housewives question exactly what was really going on."

Foster previously admitted the symptoms of her Lyme disease got so bad she could barely write, read and watch TV for a while. She just revealed in early October month two of her three children, Anwar Hadid, 16, and Bella Hadid, 19, are also fighting the chronic illness.

Foster vowed to find a cure for the disease while making a heartfelt speech at the Global Lyme Alliance Gala last month.


About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.