To heal, I must always be positive and I can't do it! The positive thinking in vogue in recent years opens the door to guilt and many other negative emotions. Taking the opposite view of this approach, JosÔee Savard proposes to approach cancer according to realistic thinking which promotes the adaptation of the person to the disease by leading him to perceive his situation as it is, while hoping that the best occurs. This approach is based on the precepts of cognitive behavioral therapy, the one that has received the most scientific evidence as to its effectiveness. All the psychological aspects related to the diagnosis and treatment of cancer are analyzed in depth: guilt and depression, anxiety and fear of recurrence, anger, insomnia, fatigue and fear of death. The author offers concrete strategies and practical advice to reduce psychological distress and improve quality of life.