complication -- (the act or process of complicating)
complication -- (a situation or condition that is complex or confused; "her coming was a serious complication")
complication -- (any disease or disorder that occurs during the course of (or because of) another disease; "bed sores are a common complication in cases of paralysis")
complication, ramification -- (a development that complicates a situation; "the court's decision had many unforeseen ramifications")