Cross-sectional observational studies reveal that cancer is more prevalent indepressed persons. Psychosocial stressors such as depression, anxiety, stressful life events, poverty, and lack of social support may favor carcinogenesis. Cancer acquired underthese circumstances has a poor prognosis. Conversely, when cancer has developed inthe presence of these factors, effective management or treatment of these psychosocialstressors may bring about increased survival time of the affected persons. The purposeof this narrative literature review is to examine the role that maladaptive stressresponses play in cancer initiation and progression. Relevant databases, hand searchesand authorative texts were critically analysed and the findings were integrated. Stress is influenced by genetic, environmental, pharmacological, and infectious factorsin addition to the chronicity of depression, social isolation, and poor stress-copingcapacity. Chronic psychosocial stress-induced maladaptive activation of theneuroendocrine system may dysregulate immunoinflammatory responses, alter oncogeneexpression, promote tumor-related angiogenesis, and accelerate growth of cancer withstimulation of neuroendocrine activity, which may favor cancer progression. Theevidence that associates psychosocial stressors to cancer progression is stronger thanthe evidence which links the same psychosocial stressors to cancer incidence.