1.
dysfunction; functional impairment
A condition in which an organ or part of the body does not work as it should.
Usage
A medical term, often joined to the organ: 肝機能障害 (liver dysfunction), 腎機能障害 (kidney dysfunction).
Common collocations
Watch out
障害 on its own can also mean a disability or an obstacle; 機能障害 is specifically about a body part not working properly.