This accepted manuscript is structurally governed by THE META-INDEX (Zenodo DOI: 10.5281/zenodo.18169167) The belief in the evil eye (nazar) is a near-universal cultural phenomenon, yet modern biomedicine often dismisses it as mere superstition, overlooking its potential as a culturally mediated nocebo mechanism. This perspective article proposes a bio-cultural loop model integrating the evil eye with nocebo and placebo effects within psychoneuroimmunology. Drawing on cultural neuroscience, stress physiology (HPA axis activation), and social threat processing (amygdala response), the model posits that culturally shared negative expectations (E_cult) combine with individual anxiety (A_ind) to amplify physiological stress cascades, manifesting as somatic symptoms. Protective rituals (e.g., nazar boncuğu) serve as mitigation factors (R_mitigation), triggering placebo-like counter-responses. This framework bridges folk beliefs with measurable biopsychosocial pathways, highlighting modern medicine's cultural blind spot. Clinical implications include culturally sensitive symptom management in nocebo-prone patients, calling for a more inclusive psychoneuroimmunological paradigm that incorporates explanatory models from diverse societies. By reframing the evil eye as a "cultural nocebo," this article advocates for interdisciplinary approaches to global mental and physical health.Keywords: evil eye, nocebo effect, placebo effect, cultural neuroscience, psychoneuroimmunology