Abstract Background Acute coronary syndrome (ACS) patients are vulnerable to anxiety and depression. This study aimed to assess the mental health burden among Egyptian ACS patients by assessing the prevalence and associates of these conditions. This study enrolled 212 patients who underwent coronary angiogram. Anxiety and depression were assessed using the Hospital Anxiety and Depression Scale (HADS). Demographic, psychosocial, and clinical data were collected. Univariate and multivariate logistic regression analyses identified factors associated with anxiety and depression. Results The mean age of the participants was 54.1 years, and 80.7% were males. More than half (58.1%) exhibited anxiety, depression, or both, with depression being more prevalent than anxiety (48.1% vs 38.2%). Past major depressive disorder was strongly correlated with both anxiety and depression. Higher anxiety scores increased the odds of depression (OR = 1.234, p < 0.001), and vice versa (OR = 1.55, p < 0.001). Hypertension and the use of antihypertensive medications were associated with increased depression. Significant associates of anxiety included increased heart rate, past use of furosemide and enoxaparin, and current polypharmacy. Conclusions A substantial proportion of ACS patients experience comorbid anxiety and depression. Polypharmacy, past depression, and hypertension are key risk factors. Targeted interventions addressing these factors are essential for improving mental health in this vulnerable population.