Chemotherapy treatments in some neoplastic patients can cause unwanted side-effects that can be accompanied by a physical weakening due to changes in executive functioning, processing speed and reaction times with a consequent inability to carry out daily life activities (ADL) or a working disability due to the loss of working memory and the inability to organize fundamental skills, influencing the quality of everyday life. Although chemotherapy-induced cognitive impairment (CICI), also known as post-chemotherapy cognitive impairment (PCCI), chemo-brain or chemo-fog, has been described in the literature since the late 1980s, the neurobiological factors behind this pathology to date are not yet fully understood. According to the finding of most studies conducted on patients affected by different forms of neoplastic diseases, there are strong enough evidence of a prominent role of some drug such as doxorubicin, cyclophosphamide, cytarabine, methotrexate, 5-fluorouracil and cisplatin in causing chemo-fog related neurological impairment. The physical incapacity that affects the patients seems, therefore, to be related to the cytotoxic effects that the chemotherapy drugs exert on the central nervous system, causing a short or long-term neurological decline. Cognitive dysfunctions could influence individual self-determination by configuring a state of transient or habitual mental infirmity capable of altering the preservation of the person's voluntary faculties, with potential consequences on the legal validity of any deeds signed by the person. The growing interest in this pathological condition by the forensic medicine community is due precisely to the non-negligible medico-legal implications that derive from it affecting aspects of private law. In this article, a review of the literature on chemotherapy-induced cognitive impairment and related issues that may arise in forensic medicine and private law was conducted. [ABSTRACT FROM AUTHOR]