A nursing diagnosis may be part of the nursing process and is a clinical judgment about individual, family, or community experiences/responses to actual or potential health problems/life processes. Nursing diagnoses foster the nurse's independent practice (e.g., patient comfort or relief) compared to dependent interventions driven by physician's orders (e.g., medication administration). Nursing diagnoses are developed based on data obtained during the nursing assessment. A problem-based nursing diagnosis presents a problem response present at time of assessment. Risk diagnoses represent vulnerabilities to potential problems, and health promotion diagnoses identify areas which can be enhanced to improve health. Whereas a medical diagnosis identifies a disorder, a nursing diagnosis identifies the unique ways in which individuals respond to health or life processes or crises. The nursing diagnostic process is unique among others. A nursing diagnosis integrates patient involvement, when possible, throughout the process. NANDA International (NANDA-I) is body of professionals that develops, researches and refines an official taxonomy of nursing diagnosis.

All nurses must be familiar with the steps of the nursing process in order to gain the most efficiency from their positions. In order to correctly diagnose, the nurse must make quick and accurate inferences from patient data during assessment, based on knowledge of the nursing discipline and concepts of concern to nurses.