Mitchell, who is NBC's chief foreign affairs correspondent, revealed the news at the end of her MSNBC show, 'Andrea Mitchell Reports.'
"And now a personal note, or how I spent my summer vacation: I had planned to be hiking in Wyoming last week," Mitchell said, "but instead discovered that I am now among the one in eight women in this country -- incredibly, one in eight -- who've had breast cancer."
Fortunately, said Mitchell, the cancer has been caught at an early stage. "Mine was discovered during my annual screening just a short time ago. Luckily for me, I'm one of the fortunate ones. We discovered it in the earliest stage, it had not spread, and I'm already back at work with a terrific prognosis."
Early stage breast cancer can often be symptomless and Mitchell urged female viewers to go and get screened: "For you women out there and for the men who love you, screening matters. Do it. This disease can be completely curable if you find it, at the right time."
Mitchell has been the Chief Foreign Affairs Correspondent for NBC News since November 1994. She previously served as Chief White House Correspondent and Chief Congressional Correspondent.
Signing off, Mitchell said, "I'll see all of you tomorrow."