<qa>  What is the SSQ?To address this problem, investigators propose to longitudinally apply the Sydney Swallow Questionnaire SSQ, a validated patient-reported outcome PRO instrument 11 that evaluates many dimensions of swallow function before, during treatment and in follow-up care of the head and neck cancer patient. The SSQ is particularly attractive as it is patient-centric and reflects their sensation of swallow-related symptoms ie. xerostomia which is important as the impact of sensory changes are otherwise not evaluated with other swallow metrics that are available. More significantly, the SSQ is quantitative, multi-dimensional encompasses other swallow-related symptoms and has discriminative power as a swallow metric. Normal population assessments have defined SSQ scores that reflect neurogenic and non-neurogenic dysphagia including cross-sectional studies in HNSCC patients. Its longitudinal application however has not been evaluated to define the natural history and prevalence of HNSCC-treatment related dysphagia. Lastly, our group has successfully validated a Chinese version of the SSQ relevant for the inclusion of nasopharyngeal cancer patients due to the increase volume of the pharynx that is treated and has developed an electronic version of both the original English and Chinese versions of the SSQ that is accessible through the web-portal of our MosaiqOncospace database that facilitates secure HIPAA-compliant data curation across institutions. 