The 51-year-old reality star has been suffering from the infectious disease from past three years. She wrote in her blog that she relapsed last December.
"Most of you know I have been battling Lyme disease for the past three years. I wasted the first year trying to get diagnosed and spent the next two trying to find a cure. I have gone from the conventional long-term antibiotics to about every holistic protocol there is to offer.
Caused by bacteria, Lyme disease can often be treated if caught early, but because Foster did not learn that she had the disease until much after she caught it, the reality TV star is struggling with harsher symptoms.
As it progresses, the illness can affect the heart and nervous system.
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"I have lost the ability to read, write, or even watch TV, because I can't process information or any stimulation for that matter," Foster admitted in her post.
She went on to voice her frustration on the lack of vaccine or cure for Lyme disease in the US.