Non-medical opioid use (NMOU), opioid use disorder (OUD) and substance use disorders (SUD) in patients with cancer present an ongoing and growing challenge to the teams caring for them, especially their most trusted partners, oncologists. NMOU and SUD encompass the spectrum of the use of opioids for emotional and non-physical pain or other symptoms. Currently, there is no literature guiding oncologists in a comprehensive approach towards recognition or management of NMOU and SUD in a patient with cancer.