The present study aims to investigate happiness, depression and life satisfaction levels after cancer treatment in individuals assessed by tools such as GHS, HDS and SWLS and to check the correlation between depression and a person's degree of happiness post cancer treatment. a sample of 50 cancer patients was found who met the inclusion criteria. Out of this group, all cancer patients who had treatment at least a year prior and who currently visit the hospital for follow-up exams every three to twelve months were included in the study. It was discovered that patients whose treatment terminated during the first two years had higher levels of depression than other groups and considerably lower levels happiness and life satisfaction vary more in some groups in comparison to others. Similarly, survivors who are younger have lower levels of depression than those that are older and show slight high levels of happiness and life-satisfaction. It has been shown that cancer survivors' depression and happiness are negatively associated to each other, as are their life satisfaction and depression, but life satisfaction and happiness are positively related. Finally, we can conclude that gender, cancer type, medication, and residence were not predictors of depression, happiness, and life satisfaction among cancer survivors.