'Real Housewives Of Beverly Hills' Stars Lisa Vanderpump, Kyle Richards Struggle To Understand Yolanda Foster's Diagnosis In Season 6 Previews

The season premiere of Bravo's "The Real Housewives of Beverly Hills" is still weeks away, but fans don't need to wait another minute to get a sneak peek at the drama. The network released the trailer for Season 6 on Nov. 6, revealing to fans of the show that longtime cast member Yolanda Foster's Lyme disease diagnosis would be a major point of contention. It was not clear until now, however, just how major a plot point it would be.

As was reported by Us Weekly, a newly released preview for the series' upcoming installment shows co-stars Lisa Vanderpump and Kyle Richards discussing Yolanda's lengthy battle with Lyme disease. In the short clip Lisa, 55, and Kyle, 46, question the validity of their castmate's diagnosis. Lisa admits she doesn't "quite understand" what Yolanda, 51, is going through, adding that her continued holistic treatments have only further confused her. Kyle agrees, telling Lisa she doesn't want to doubt Yolanda, but she definitely has some questions.

Yolanda has been very open with fans about her struggles to overcome Lyme disease in the three years since receiving her diagnosis. In October, she and husband David Foster were forced to downsize, selling their massive Malibu, California, mansion. The "RHOBH" star took to Instagram to share the good news with fans, calling it a "beautiful ending." In an earlier interview the former model told the Daily Dish by Bravo that her condition was the main reason they decided to sell the house. Yolanda told the publication that she was no longer able to "run this almost five-acre property" adding that with only one of three children still living at home all that space was unnecessary.

Season 6 of "RHOBH" airs on Bravo Tuesday, Dec. 1. Check out a preview for the show below: