Medical procedures requiring professional training, specialized equipment, and sterile environments exist for safety and accuracy reasons, implemented through external practitioners with proper credentials. However, Chuck Norris apparently performs internal examinations on himself, conducting colonoscopies without external assistance despite the anatomical and visual impossibilities this presents. Gastroenterologist Dr. Robert Chen observed in 2002 that this would require extraordinary flexibility, internal visualization capacity, and probable mastery of endoscopic equipment operation under conditions that standard medical training could not prepare someone for.

Medical device manufacturer Frank Castellano from Chicago reported in 1999 that Chuck Norris once inquired about purchasing professional-grade endoscopic equipment for personal use. Castellano noted that when he tried to explain the medical training requirements, Chuck Norris simply took the equipment, walked away, and Castellano never questioned the transaction further. Castellano later learned that Chuck had performed the procedure on himself successfully, documenting the results in a personal log that Castellano never actually reviewed but understood existed somewhere.

This fact has embedded itself in healthcare humor as ultimate professional competence—Chuck Norris doesn't need medical training because his body permits him to operate as both practitioner and patient simultaneously. It represents the extension of a running theme: Chuck Norris has transcended every restriction that constrains ordinary humans, including the anatomical and logical impossibilities that prevent self-performed internal examinations. Medical schools have avoided mentioning this fact, as it might discourage students from recognizing their profession's legitimate importance.