This module explores the pathophysiology, nutritional challenges, and dietary management of lung and head and neck cancers. It covers cancer-related inflammation, muscle wasting, weight loss, anorexia, dyspnea, dysphagia, mucositis, xerostomia, taste alterations, and treatment-related gastrointestinal symptoms. The module focuses on high-protein and energy-dense nutrition, small frequent meals, symptom-specific dietary modifications, appropriate supplementation, and nutrition support for maintaining strength and treatment tolerance. Emphasis is placed on early nutritional intervention and multidisciplinary care, including collaboration with speech-language professionals, to support swallowing function, physical status, recovery, and quality of life.