Overview
The disease was first noticed when the twins were around the age of four. Doctors have been unable to identify it, and have not been able to match it to any known diseases. As a result, the Fields sisters have undergone numerous tests, but nothing as of yet has been found that can mitigate the condition. There is not a definitive cause that has been determined, and doctors have generally concluded that the were born with it and it does not appear to be contagious.
Read more about this topic: Fields' Disease