Brandi Glanville was rushed to the hospital Thursday night RadarOnline.com reports.
"Brandi was feeling nauseous all day and was having weird chest pains so an ambulance was called and she was taken to the hospital," an insider says.
"She found a weird lump under her arm, which turned out not to be cancer, but doctors still couldn't figure out what's wrong with her. She's home now, but she's sick."
Her bestie from The Real Housewives of Beverly Hills Lisa Vandercamp and her husband went to the E.R. with her and an insider says Brandi is worried.
"Of course Brandi is scared. Any sort of medical scare is going to be scary, especially when you can't figure out what's wrong," the source said. "We're all very concerned."