Vicki Gunvalson's daughter, Briana Culberson, appears to be suffering from a mysterious illness.

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After undergoing surgery last month to remove enlarged lymph nodes, Culberson was deemed cancer-free, but unfortunately, her health struggles have continued, leading her to the Mayo Clinic in hopes of a diagnosis and solution.

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Culberson and her mother have gone through tough times on The Real Housewives of Orange County, especially in the past few seasons, but luckily, as Culberson's health remains concerning, her mother remains at her side.

As Culberson searches for a diagnosis, she and her husband, Ryan, are preparing for a move from Oklahoma back to Orange County, where Gunvalson resides. In November, Gunvalson shared the exciting news with fans on Twitter.

"God answered our prayers today. Briana/Ryan put an offer on a house today in OC and it was accepted," Gunvalson tweeted. "Everything is finally coming together."

The Culbersons had previously moved to Oklahoma because of Ryan's job with the Marines.