Abstract The ‘Public Health Residents’ Anonymous Survey in Italy” (PHRASI) represented the first study to specifically investigate mental health and its determinants among Italian public health residents (PHRs). Using a voluntary, anonymous, electronic, 88-item questionnaire, the PHRASI study generated evidence on well-being, eating disorders, sleep disorders, alcohol abuse, depressive symptoms, and anxious symptoms among PHRs. This highlights the correlation with sociodemographic, lifestyle, and work-related characteristics during COVID-19 pandemic. The data was collected in a nationally representative sample of PHRs enrolled in any of the four course years of Italian Public Health schools. The recruitment took place through the communication channels of the Medical Residents’ Council of the Italian Society of Hygiene and Preventive Medicine in the summer 2022. The key findings reveal prevalence rates of mental health conditions comparable to those seen in other healthcare workers during the COVID-19 pandemic: 61% of residents report depressive symptoms and 36% report anxious symptoms. The study also highlights a negative correlation of these symptoms with characteristics of the training and working environment, such as the level of supervision and peer-to-peer support. A stronger social network and higher levels of physical activity emerged to be positively associated with well-being and depression. These and other findings will be available in the final report of the survey that will be presented during the congress. PHRASI led the way to the Residents’ Mental health Investigation, a Dynamic longitudinal study in Italy (ReMInDIt), that aims to explore potential cause-effect relationships between risk/protective factors and mental health outcomes. This evidence could guide the scientific community, school directors, universities, and policymakers in the continuous process of improving the educational quality and working conditions of PHRs. Key messages • Residency training and work environment impact the mental health of the PHR workforce. • It is important to deploy concrete efforts into building healthy work environments and guarantee adequate training for PHRs.