Over a period of 55 12-h intervals (28 days), we investigated in the current study the correlations between urinary IL-6 levels and mood, irritation, and mental activity in a patient with prior breast cancer under conditions of “life as it is lived.” As anti-inflammatory medication (Zhang et al., 2017) and physical activity (Meneses-Echávez et al., 2016) are two examples of potential confounders of the IL-6 relations investigated in this study, we included theses variables in the analyses. Here, IL6 is linked to breast cancer.