Which statement best defines illness?

• A. A temporary feeling of unwellness that resolves without treatment.
• B. A state in which a person's physical, emotional, intellectual, social, developmental, or spiritual functioning is diminished or impaired compared with the previous experience.
• C. An expected response to aging.
• D. A condition that can be diagnosed with a single lab test.

Answer: (B)

Illness is experienced as a state in which a person’s functioning is diminished or impaired across multiple dimensions—physical, emotional, intellectual, social, developmental, or spiritual—compared with their previous level of functioning. This definition focuses on how the condition affects the whole person and their ability to live their usual life, not just the presence of symptoms.

This is why it fits best: it captures the broad, holistic impact of a health problem, including subjective experience and daily life, rather than just a biomedical finding. A temporary feeling of unwellness that resolves without treatment describes short-lived symptoms without lasting impairment. Aging is a normal process, not an illness. Relying on a single lab test to diagnose illness overlooks the person’s lived experience and how the condition changes functioning in daily life.

Understanding illness as the person’s overall experience and its effect on functioning helps nurses assess needs, plan holistic care, and address the various domains that influence recovery and quality of life.