On November 4 it was confirmed that Lesnar was suffering from mononucleosis and that his bout with Carwin would have to wait a bit longer and the fight for Lesnar's heavyweight championship was canceled. On November 14 at the "UFC 105" post-fight conference, Dana White stated, "'s not well and he's not going to be getting well anytime soon" and that an interim title match might need to be set up. In addition to mononucleosis, it was revealed that he was suffering from a serious case of diverticulitis, an intestinal disorder, which required surgery. After further diagnosis, Lesnar underwent surgery on November 16 to close a perforation in his intestine that had been leaking fecal matter into his abdomen, causing pain, abscesses and overtaxing his immune system to the point that he contracted mononucleosis. From the level of damage to Lesnar's system, the surgeon estimated that the intestinal condition had been ongoing for around a year.