This is a term for an illness that is not made available to the public or to family/friends.
Undisclosed illness.
Richard Widmark passed away on March 24, 2008 at the age of 93. He died after suffering from an undisclosed illness.
salary undisclosed
The Undisclosed ended on 2006-04-28.
The duration of The Undisclosed is 2700.0 seconds.
The Undisclosed was created on 2006-04-03.
He was awarded an undisclosed amount in final settlement.
Undisclosed Desires was created on 2009-11-16.
Phillis Wheatley died from an undisclosed illness. She died at the age of 31 on December 5, 1784 in Boston, MA.
Microsoft acquired Skype for an undisclosedsum.The secret was undisclosed to my friends.
It is, thus far, undisclosed. Drake has asked that people "please respect my family's privacy during this time". It seems they've done that as I can't find any information.
Undisclosed Files Addendum was created on 1995-02-27.