Positive Emotions and Psychological Well-being: A Review of Interventions in Clinical Populations

Purpose:  This article critically reviews and synthesizes existing empirical studies on positive emotion-based psychological interventions across clinical populations, particularly focusing on individuals diagnosed with cancer and those experiencing significant emotional distress. The review aims to explore how constructs like gratitude, hope, optimism, and emotional regulation contribute to psychological well-being and resilience, and to evaluate the efficacy of therapies grounded in positive psychology theories. Design:  This is an overview of the literatures that incorporates results from quantitative and qualitative studies, systematic reviews, and theoretical frameworks. The review includes studies spanning multiple clinical populations, with a special focus on oncology, and considers a variety of methodologies such as quasi-experimental designs, cross-sectional surveys, longitudinal studies, and randomized controlled trials. Findings: Positive emotions such as gratitude, hope, and optimism are closely associated with better well-being, resilience, and better quality of life in clinical populations. Interventions like gratitude practices, PERMA-based programs, expressive writing, and emotion regulation strategies (e.g., mindfulness) effectively reduce distress and improve coping. Implications: Integrating positive psychology into clinical care, especially in oncology, can enhance emotional outcomes. Cancer care providers should be trained in implementing these strategies, supported by standardized protocols and long-term evaluations. Future research should prioritize diverse populations, digital delivery, and cultural adaptability.