Book excerpt: This book is a unique resource on the influence cancer and cancer treatments have on cognition. The majority of cancer patients on active treatment experience cognitive impairments often referred to as 'chemobrain' or 'chemofog'. In addition, patients with primary or metastatic tumors of the brain often experience direct neurologic symptoms. This book helps health care professionals working with cancer patients who experience cognitive changes and provides practical information to help improve care by reviewing and describing brain-behavior relationships; research-based evidence on cognitive changes that occur with various cancers and cancer treatments; assessment techniques, including neurocognitive assessment and neuroimaging techniques; and intervention strategies for affected patients. In short, it will explain how to identify, assess and treat these conditions.