This retrospective study investigated, in two cohorts of subjects living in Southern Italy and awaiting treatment for oral squamous cell carcinoma(OSCC), the variables related to diagnostic delay ascribable to the patient, with particular reference to the cognitive and psychological ones. A total of 156 patients with OSCC(mean age: 62 years, M/F: 2.39 : 1) were recruited at the Universities of Palermo and Naples. Risk factors related to patient delay included: sociodemographic, health-related, cognitive and psychological variables. The analysis was conducted by considering two different delay ranges: dichotomous(f1 month vs..1 month) and polytomous(,1 month, 1–3 months,.3 months) delay. Data were investigated by univariate and multivariate analyses and a P value f0.05 was considered statistically significant. For both delay measurements, the most relevant variables were: ‘Personal experience of cancer’(dichotomous delay: P50.05, odds ratio(OR)50.33, 95% confidence interval(CI)50.11–0.99; polytomous delay: P50.006, Chi-square510.224) and ‘Unawareness’(dichotomous delay: P,0.01, OR54.96, 95% CI52.16–11.37; polytomous delay: P50.087, Chi-square54.77). Also ‘Denial’(P,0.01, OR56.84, 95% CI52.31–20.24) and ‘Knowledge of cancer’(P50.079, Chi-square58.359) were found to be statistically significant both for dichotomous and for polytomous categorization of delay, respectively. The findings of this study indicated that, in the investigated cohorts, the knowledge about cancer issues is strongly linked to the patient delay. Educational interventions on the Mediterranean population are necessary in order to increase the patient awareness and to emphasize his/her key role in early diagnosis of OSCC. This retrospective study investigated, in two cohorts of subjects living in Southern Italy and awaiting treatment for oral squamous cell carcinoma (OSCC), the variables related to diagnostic delay ascribable to the patient, with particular reference to the cognitive and psychological ones. A total of Risk factors related to patient delay included: sociodemographic, health-related, cognitive and psychological variables. The analysis of 156 patients with OSCC (mean age: 62 years, M / F: 2.39: 1) were recruited at the Universities of Palermo and Naples. was conducted by considering two different delay ranges: dichotomous (f1 month vs..1 month) and polytomous (, 1 month, 1-3 months, .3 months) delay. Data were investigated by univariate and multivariate analyzes and a P value f0 For both delay measurements, the most relevant variables were: ’Personal experience of cancer’ (dichotomous delay: P50.05, odds ratio (OR) 50.33, 95% confidence interval (CI) 50.11 -0.99; polytomous delay: P50.006, Chi-square 510.224) and ’Unawareness’ (dichotomous delay: P, 0.01, OR54.96, 95% CI52.16-11.37; polytomous delay: P50.087, Chi-square54 .77). Also ’Denial’ (P, 0.01, OR56.84, 95% CI52.31-20.24) and ’Knowledge of cancer’ (P50.079, Chi-square58.359) The findings of this study that that, in the investigated cohorts, the knowledge about cancer issues is strongly linked to the patient delay. Educational findings of this study indicated that, in the investigated cohorts, the knowledge about cancer issues is strongly linked to the patient delay. awareness and to emphasize his / her key role in early diagnosis of OSCC.