From wikipedia -
Mitchell is currently receiving treatment for the controversial condition called "Morgellons syndrome". Mitchell spoke to the Los Angeles Times on April 22, 2010 about the disease, saying, "I have this weird, incurable disease that seems like it's from outer space, but my health's the best it's been in a while." She described Morgellons as a "slow, unpredictable killer" but said she is determined to fight the disease. "I have a tremendous will to live: I've been through another pandemic—I'm a polio survivor, so I know how conservative the medical body can be." According to Mitchell, Morgellons is often misdiagnosed as "delusion of parasites," and sufferers of the disease are offered psychiatric treatment. Mitchell said she plans to leave the music industry to work toward giving people diagnosed with Morgellons more credibility. In the same interview, Mitchell made the statement that singer-songwriter Bob Dylan, with whom she had worked closely in the past, was a fake and plagiarist. The controversial remark was widely reported by other media. Mitchell did not explain the contention further, but it may have related to the allegations of plagiarism surrounding some lyrics on Dylan's 2006 album Modern Times.