Psoriasis-associated IgA nephropathy (IgAN-pso) is a rare but clinically significant renal disorder characterized by complex interactions between immune dysregulation and cutaneous inflammation. This review describes the clinical presentations and histopathological characteristics of IgAN secondary to psoriasis, emphasizing the multifactorial mechanisms underlying its development and progression. Recent developments in understanding the immunological interplay between psoriatic lesions and renal IgA deposition have been analyzed, with particular attention given to the roles of aberrant mucosal immunity, genetic susceptibility, and systemic inflammatory mediators. Following the discussion of pathogenesis, this review examines current diagnostic challenges, particularly the differentiation between primary IgA nephropathy and secondary IgA nephropathy associated with psoriasis. It also evaluates therapeutic approaches that integrate dermatological and nephrological management, including the use of immunomodulatory agents. By synthesizing current clinical case studies with fundamental research findings, this study aims to offer clinicians an extensive understanding of disease identification and treatment strategies. Ultimately, the goal is to facilitate early diagnosis, optimize individualized therapeutic strategies, and improve long-term renal and dermatological outcomes for the patients.