Towards the second half of last century some psychologists, upon observing an overwhelming emphasis on negative mood states in psychology, and recognizing the positive in human beings, started to explore into the scientific study of subjective well-being (SWB = happiness). Oftentimes, the cancer patients and caregivers (family members) are not completely merged in such experience on their own, but there is an interplay of cancer experience and its concerns, which mutually affects the patients and caregivers in terms of their SWB. Thus, this study on SWB (happiness) examined the range of well-being of cancer patients and their caregivers from misery to elation. This book can be a valuable contribution to know how cancerous cancer is, not only to the patients’ SWB but also to the caregivers’ SWB. It also deals with how they cope with their own life demands and draws guidelines that may be of help to professionals who are involved in counseling such population. This work enlightens the cancer patients on their situation and their multifaceted needs enabling caregivers to comprehend their family member in a positive light, improve caring skills and enter into cure-giving process.