Written by the Fiveable Content Team โข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโขWritten by the Fiveable Content Team โข Last updated September 2025
Definition
Illness refers to a state of poor health or disease that affects the normal functioning of an organism. In psychology, it is used to describe abnormal behavior seen as a result of malfunctioning parts within the individual.