This study examines the portrayal of cognitive decline and its impact on social categorization in Lisa Genova’s novel Still Alice. Genova uses her background in neuroscience and narrative skills to depict Alice Howland’s journey as a renowned linguistics professor who is diagnosed with early-onset Alzheimer’s disease. Analyzing the novel through John Turner’s Social Categorization theory, the research explores how Alice’s memory decline impacts her self-concept and social roles. It also shows her transition from an academic identity to that of an Alzheimer’s patient, illustrating changes in social categorization and self-perception due to the disease. The study also examines stereotypes and biases rooted in cognitive psychology, revealing how they shape family interactions with Alzheimer’s patients. It also highlights the complex social challenges posed by Alzheimer’s disease and offers insights into how memory loss impacts identity and social perception. This analysis contributes to a deeper understanding of the relationship between cognitive decline, identity, and social dynamics.