She experienced 'complications' during her pregnancy.
The negotiations stalled when 'complications' arose.
The patient died of 'complications' from surgery.
(..) if only to get more time to work... ...on our vaccine. My lateness might as well have been absence. A course has already been taken. There are complications. Mulder saw one of the infected bodies we destroyed in Dallas. He's there now. Someone tipped him. Who? - Kurtzweil, we think. (..)1998 The X Files