The development in radiotherapy has grown fast, so patient care staff must deal with this development and the new aspect on care of cancer patient. The basic structures in patient care have not changed, that is; the patient and his care staff must be seen as one team in the hospital. The patient is the reason for the existence of this health organization as a whole, which has no life, no purpose, and no value without him. This makes the patient the most important person in the hospital. As the hospital personnel share the common purpose of being there to serve patients, so patients have in common the feature of being in need of help. This book teaches some principals of radiotherapy and chemotherapy and gives an introduction to care of cancer patients. It gives a basic introduction to the concepts of psychological aspects of cancer, as well as the basics of side effects and toxicity of radiation and Chemotherapy treatment and a comprehensive overview of how to treat them.