In 2012, Foster was diagnosed with Lyme disease, as she has stated multiple times on several episodes of The Real Housewives of Beverly Hills. In December 2012, she reported that she was having a port implanted in her arm to help treat her chronic Lyme disease. In April 2013, she had the port removed. In January 2015, she revealed that, as a consequence of the illness, she had "lost the ability to read, write, or even watch TV".