Cher has been forced to cancel the remaining dates in her Dressed To Kill Tour.
The singer said in a statement that she needs time to help her recover from a viral infection that first hit her in September, E! Online reports.
'I am totally devastated,' the 68-year-old said.
'Nothing like this has ever happened to me. I cannot apologize enough to all the fans who bought tickets. I'm so proud of this show. It is my best ever.
'I sincerely hope that we can come back again next year and finish what we started.'
The pop diva postponed a number of gigs in September and October due to her illness.
The virus affected her kidney function and she was briefly hospitalised before being released with a monitor to check her heart function, according to Closer Weekly.
Her D2K tour restarted in Texas on November 9, according to Cher's official website.
But she has already skipped six dates this month and had 23 left on the schedule before the tour's wrap on February 4, in Fargo, North Dakota.
Now doctors have advised the star to get some rest.
On Thursday, she tweeted, sadly: 'Iím SORRY I Couldnít B the 1 to tell you about postponing my tour. I Tried SO HARD 2b Strong enough, but my Will couldnít force my Body time' (sic).
In a second blast she described her 'gut wrenching Sadness of not being Able 2 go on stage, sing, b Silly, & wear new Mackieís & Mike,' referring to the designers of her amazing costumes.
The D2K tour began in March 2014 and reached 49 cities before illness hit Cher.
First rising to fame in 1965 as part of Sonny & Cher, the singer has been a staple of the popular-music scene for almost five decades.
Her most recent album, Closer To The Truth, was released in 2013, and included a number one single, Woman's World.
Source: Mail Online