Secretary of Defense Lloyd Austin’s hospitalization is the result of complications from a procedure he received to treat prostate cancer, according to medical officials.

Austin, 70, was diagnosed with prostate cancer last month, which was detected early, and on Dec. 22, he “underwent a minimally invasive surgical procedure called a prostatectomy to treat and cure prostate cancer,” according to a statement from Dr. John Maddox, Walter Reed National Military Medical Center’s trauma medical director, and Dr. Gregory Chesnut, the director of the Center for Prostate Disease Research of the Murtha Cancer Center.