For this study, we defined the Adolescent and Young Adult (AYA) generation as people aged 15 to 39 years old. Otorhinolaryngologists, who often have the opportunity to treat cancer patients of the AYA generation, need to recognize the influence of cancer treatment on the fertility of patients of this generation. Therefore, we conducted a retrospective review of the data of 60 cases of the AYA diagnosed as having head and neck cancer at our department. When the risk of gonadal toxicity associated with head and neck cancer treatment was examined according to the guidelines for fertility preservation, 1 patient was found to be at a high risk and 3 were found to be at intermediate risk. Nevertheless, the risk of gonadal toxicity was not explained in the document, and it is considered that revision of the document would be necessary. In order to secure the fertility of head and neck cancer patients of the AYA generation before the start of cancer treatment, it is necessary to promptly share information about the patients with doctors of the department of obstetrics and gynecology and department of urology. It is necessary to build a reproductive medicine network to ensure prompt cooperation.