Joni Mitchell was hospitalized yesterday (March 31) after being found unconscious in her home. According to TMZ, the 71-year-old singer-songwriter was rushed to the hospital after a 911 call was made from her home.

TMZ reports that sources told paramedics were sent to Mitchell's Los Angeles house around 2:30PM. According to an update posted on her Facebook page, Mitchell was alert on her way to the hospital:

Joni was found unconscious in her home this afternoon. She regained consciousness on the ambulance ride to an L.A. area... Posted by JoniMitchell.com on Tuesday, March 31, 2015

As of this time, "it's unclear what prompted the medical emergency, but it appears to be quite serious," according to TMZ.

Last year, Mitchell admitted that she suffers from a rare skin condition, called Morgellons. She said that the ailment has confined her to home, and has even made wearing clothing unbearable. The condition is considered controversial among medical professionals, many of whom claim that it is psychological.

At the time, Mitchell said that the illness is incurable, stating that “fibers in a variety of colors protrude out of my skin like mushrooms after a rainstorm … They cannot be forensically identified as animal, vegetable or mineral.”