"I need you to know, I learned today, from my doctors that I must have surgery soon," the 49-year-old icon wrote. "It breaks my heart to tell you that I am forced to postpone the Unbreakable Tour until the spring. Every date will be rescheduled. Please hold on to your tickets. They will be honored in a special way when the new schedule is announced. Please pray for me, my family and our entire company during this difficult time. There will be no further comment. I love you all so much and am ever grateful for your understanding and your love. Gon' b alright."
Janet kicked off her world tour in Vancouver, Canada on Aug. 31 and has been touring through November. After a break for over the holidays, she was set to pick back up on Jan. 9 in Denver, Colorado.
See photos of Janet Jackson:
Janet Jackson postpones Unbreakable Tour to undergo surgery
Janet Jackson arrives at amfAR's 20th Annual Cinema Against AIDS at Hotel du Cap-Eden-Roc on May 23, 2013 in Cap d'Antibes, France. (Photo by Tony Barson/FilmMagic,)
MILAN, ITALY - FEBRUARY 25: Janet Jackson attends the Giorgio Armani fashion show as part of Milan Fashion Week Womenswear Fall/Winter 2013/14 on February 25, 2014 in Milan, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)
LOS ANGELES, CA - SEPTEMBER 08: Janet Jackson attends the Dylan's Candy Bar Los Angeles Opening at Original Farmers Market on September 8, 2012 in Los Angeles, California. (Photo by John Sciulli/WireImage)
ANTIBES, FRANCE - MAY 24: Janet Jackson arrives at the 2012 amfAR's Cinema Against AIDS during the 65th Annual Cannes Film Festival at Hotel Du Cap on May 24, 2012 in Cap D'Antibes, France. (Photo by Dominique Charriau/WireImage)
NEW YORK, NY - MAY 10: Janet Jackson attends the Marco Glaviano 'Supermodels' exhibition opening at the Keszler Gallery on May 10, 2012 in New York City. (Photo by Jim Spellman/WireImage)
MIAMI BEACH, FL - DECEMBER 05: Janet Jackson performs at Fillmore Miami Beach on December 5, 2011 in Miami Beach, Florida. (Photo by Larry Marano/Getty Images)
LONDON, ENGLAND - JUNE 30: Janet Jackson performs on her Janet Jackson Number Ones: Up Close & Personal Tour at The Royal Albert Hall on June 30, 2011 in London, England. (Photo by Dave J Hogan/Getty Images)
BERLIN, BERLIN - JUNE 24: US singer Janet Jackson performs live at the Tempodrom on June 24, 2011 in Berlin, Germany. (Photo by Marco Prosch/WireImage)
US singer Janet Jackson speaks during the 19th Life Ball in front of the city hall in Vienna, Austria, on May 21, 2011. The Life Ball is a charity gala to raise money for people living with HIV and AIDS.AFP PHOTO/JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)
Janet Jackson attends amfAR's Cinema Against AIDS Gala during the 64th Annual Cannes Film Festival at Hotel Du Cap on May 19, 2011 in Antibes, France. (Photo by Tony Barson/WireImage)
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Prior to her first U.S. date, Janet went against the advice of her doctors to go on with the show and totally delivered.
"It was a nonstop dance party," an eyewitness told ET. "She is back as the Queen of Pop. She hasn't lost a step."
However, she was forced to postpone two dates in October due to doctor's orders.
Must postpone Kansas City & St. Louis... Doctors orders. Hold onto your tickets! I'll be back in Omaha. 💕 #Unbreakable