Philosophical beliefs or principles can help healthcare providers establish effective approaches to mental health analysis. This article aims to demonstrate how modern philosophical tenets could improve mental health analysis from diagnosis to treatment. It describes the role and importance of philosophical approaches, including the Gadamer philosophical hermeneutics, in providing alternative approaches to mental illness treatments as an interdisciplinary field combining practical views and methods of the philosophies of mind, neuroscience, psychology, and moral philosophy. This is achieved by exploring the evolution of mental illnesses, the philosophical views on the manifestation of psychiatric disorders, scientific and philosophical viewpoints, and insights on applying Gadamer’s philosophical hermeneutics to mental illnesses. Gadamer’s viewpoints present essential philosophical foundations that could solve the crucial problems associated with the antecedent theories of mental illnesses. Overall, the philosophical viewpoint requires patient diagnosis and treatment approaches that holistically consider the use of language in all interpretive practices, cultural phenomena, patients' histories, and environmental factors that are critical sources of hermeneutic experiences.