The Chinese word **并发症** (bìngfāzhèng), meaning "complication (of a disease)," is a compound term formed through semantic combination: the first element **并** (bìng) carries the meaning of "simultaneously" or "to combine," **发** (fā) means "to arise" or "to occur," together forming **并发** meaning "to occur concurrently" or "to complicate," which then modifies the head element **症** (zhèng), meaning "disease" or "symptom." Thus, the entire term literally and conceptually denotes a "concurrently arising disease/symptom"—that is, a secondary condition that develops alongside or as a consequence of a primary disease. This structure exemplifies a common Chinese word-formation pattern where a descriptive verb phrase (并发) modifies a nominal core (症) to create a precise, functionally transparent medical term.