Pathological narcissism (PN) and narcissistic personality disorder (NPD) have primarily been identified by striking external features, such as superiority, attention seeking and a critical or condescending attitude, and less attention has been paid to the internal processing contributing to this particular personality functioning. High dropout from treatment and challenges in building a therapeutic alliance with these patients call for further understanding of the complexity of disordered narcissism. Recent research on neuropsychological underpinnings to narcissistic pathology have provided valuable information that can inform therapeutic interventions for patients with this personality pathology. Internal processing in patients with PN or NPD is specifically influenced by compromised emotion processing and tolerance, identity diffusion, fluctuating sense of agency, reflective ability, perfectionism-related selfesteem, and ability to symbolize. The aim of this article is to review research studies with relevance for internal processing related to disordered narcissism and integrate findings with therapeutic strategies in alliance building with these patients.