A pilot study of a smartphone-based monitoring intervention on head and neck cancer patients undergoing concurrent chemo-radiotherapy.

•Treatments for head and neck cancer are effective but can have severe side effects.•Patient-reported outcomes favor early detection and treatment of side effects.•Few apps address patient-reported outcomes and education for head and neck cancer.•The study shows the app usability/perceived usefulness/feasibility of use.•The pilot study elicited patients’ feedbacks about some flexibility issues of the app.