Oral mucositis (OM) is an inflammatory reaction of the oropharyngeal mucosa to cumulative chemotherapy (CT) and radiation therapy (RT), affecting one or more parts of the digestive tract along with the quality of life (QoL) of the patient. The goal of this study was to identify valid and reliable tools to evaluate QoL related to OM. A systematic review of the literature was conducted up to May 2016. Articles were selected by peers using the PubMed database through a search following the inclusion and exclusion criteria and STAndards for the Reporting of Diagnostic accuracy studies (STARD) checklist with a cut-off point ≥ 70%. We identified four relevant articles that described instruments to assess the QoL related to OM in patients undergoing cancer treatment. The evaluation of the QoL in patients with OM is a difficult scenario because of its multiple variables. The knowledge of this relationship is limited because general instruments of oral health or cancer therapy are commonly used for evaluation. However, valid instruments are already available for estimating the impact of OM on the QoL from the patient's perspective. Copyright © 2016 Hospital Infantil de México Federico Gómez. Publicado por Masson Doyma México S.A. All rights reserved.