Loneliness and mental well-being in the Polish population during the COVID-19 pandemic: a cross-sectional study.

It is necessary to identify those most vulnerable to loneliness, anxiety and depression during a crisis to assess health needs and proactively allocate resources during and after the pandemic. Loneliness, anxiety, depression and irritability are important factors to consider in a population of younger, disadvantaged people, who tested positive for SARS-CoV-2, people who were quarantined at home, and people who believe that their physical and mental health is worse than in the pre-pandemic period. It is important to cater for the mental health of individuals during the COVID-19 pandemic and to promote psychological interventions to improve mental well-being in potentially vulnerable social groups.