Yolanda Foster's Lyme disease is reportedly a main story line during the upcoming season of The Real Housewives of Beverly Hills.

Does The 'RHOBH' Cast Question Yolanda Foster's Lyme Disease?

Although the mother of three has been open with her struggles on the show for years, and often documents her treatments with quotes and photos on social media, members of the Bravo reality cast have allegedly questioned her diagnosis.

"I think for a lot of people it's very confusing," Foster's co-star, Kyle Richards, told Entertainment Tonight earlier this month. "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. It was not a good situation."

Why Does 'RHOBH' Star Yolanda Foster Spend The Majority Of Her Time In Bed?

While Foster's co-stars are allegedly unconvinced that her disease is as bad as she portrays, the reality star continues to focus on her health, and the health of her children, two of whom are also suffering from the illness.

On Instagram on Monday, Foster seemed to address the news of her co-stars' alleged disbelief, with a post about staying positive.

"Focus on the positive...... #Monday #NoteToSelf," Foster wrote to her fans and followers, along with a photo meme, which read, "New Week, New Goals, New Challenges."

For more Yolanda Foster, tune into The Real Housewives of Beverly Hills season six, premiering on Dec. 1, at 9 p.m. on Bravo.

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Yolanda foster, Reality TV, Bravo, The Real Housewives of Beverly Hills