Complication

Part of speech: noun (n.)

1. The act or process of complicating; the state of being complicated; intricate or confused relation of parts; entaglement; complexity. A complication of diseases. Macaulay. Through and beyond these dark complications of the present, the New England founders looked to the great necessities of future times. Palfrey.

2. A disease or diseases, or adventitious circumstances or conditions, coexistent with and modifying a primary disease, but not necessarily connected with it.