Background: Oxaliplatin (OXA) is frequently used in the treatment of patients with colorectal cancer (CRC) and OXA-induced neurotoxic side effects is common. Real time patient-reported neurotoxic side effects and impact on the patient's daily activities, are sparse in existing studies. Objective: This study aimed to identify and assess patient-reported OXA-induced neurotoxic side effects and their impact on the patient's daily activities, during and after chemotherapy. Methods: In a multicentre prospective longitudinal study, 46 chemo naïve patients with CRC treated with postoperative adjuvant OXA-based chemotherapy were monitored during treatment and at 3-, 6-, 9-and 12-month follow-ups. Patients were recruited from September 2013 to June 2016. In total, 370 OANQ (Oxaliplatin-Associated Neurotoxicity Questionnaire) responses were available for analysis. A mobile phone-based system was used to receive real time assessments. Results: All patients reported neurotoxic side effects and impact on daily activities during treatment. The side effects changed in character and body location over time, and had an impact on the daily activities. Conclusions: The high prevalence of OXA-induced neurotoxic side effects significantly interfered with the patients' daily activities. We found significant differences between baseline data and follow-up time points for neurotoxicity, and the patients had not returned to baseline after one year.