1. problems or difficulties that make a situation more complex or harder to deal with
Usage: plural form of complication
2. medical problems that occur during or after treatment, surgery, or illness
Usage: medical context

Examples

• The project faced several complications that delayed its completion.
• Legal complications arose during the contract negotiations.
• The surgery went well, but there were minor complications afterward.
• Weather complications forced the airline to cancel many flights.
• She recovered quickly from the operation without any complications.
• The divorce proceedings were full of financial complications.
• Complications from the infection required additional treatment.