complication
com.pli.ca.tion \.ka:m-pl*-'ka--sh*n\ n 1a: COMPLEXITY, INTRICACY; specif : a situation or a de tail of character complicating the main thread of a plot 1b: a making difficult, involved, or intricate 1c: a complex or intricate feature or element 1d: a difficult factor or issue often appearing unexpectedly and changing e xisting plans, methods, or attitudes 2: the act or process of complicating : the state of being complicated 3: a secondary disease or condition developing in the course of a primary d isease
Webster's English Dictionary