Chemoradiotherapy is an organ sparing treatment for advanced head and neck cancer. However, it can have short and long-term effects on basic functions such as swallowing. Eating and drinking is an important issue for patients and their quality of life. Early posttreatment effects include mucositis, oedema, xerostomia and taste changes, making swallowing painful and secretion management difficult. Long-term effects include fibrosis and persistent oedema, which compromises swallowing ability with patients at risk of aspiration, dependency on feeding tubes and nutritional deficiency. Depending on its severity, dysphagia can lead to serious medical problems such as pneumonia. This article aims to review swallowing assessment procedures, common features of a post-chemoradiotherapy swallowing impairment and rehabilitation.