Radiation therapy is a standard treatment for malignant tumors of the head and neck and pelvic regions, used alone or in combination with chemotherapy. While effective, it is often associated with adverse effects that can impact patient outcomes. Among the most frequent toxicities is radiation-induced dermatitis (RID), affecting up to 95% of patients. These skin reactions, ranging in severity, may compromise quality of life and lead to treatment interruptions.The severity of RID is influenced by both intrinsic and extrinsic factors. Intrinsic factors include age, sex, ethnicity, nutritional status, and comorbidities such as diabetes or systemic inflammation. Extrinsic factors include the radiation technique, total dose, treated volume, and presence of infections. These variables require close monitoring to reduce complications.Radiation damages the skin and underlying tissues, causing xerosis, pigmentation changes, loss of elasticity, fibrosis, and varying degrees of dermatitis. Effective prevention starts with patient education and skincare support throughout treatment to reduce incidence and severity.In Italy, head and neck cancers, though less common than other malignancies, present a significant clinical burden. Laryngeal cancer accounts for around 5,000 new cases annually. Oral cavity, pharyngeal, and thyroid tumors also have notable incidence and require complex treatments such as (chemo)radiotherapy, increasing the risk of RID.RID represents not only a clinical issue but also a psychological and functional challenge. Pain, emotional distress, and reduced autonomy are key aspects affecting patients' overall wellbeing. A multidimensional approach that integrates clinical care and psychosocial support is essential.This study aims to investigate the relationship between RID severity, pain, psychological distress, and functional autonomy during radiotherapy or chemoradiotherapy, identifying predictors of severe toxicity and guiding personalized supportive care.