**Abstract**

Beginning with its emergence in Wuhan, China, in December 2019, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a pandemic that causes COVID-19, has spread and left profound consequences on the lives and health of people around the world. Although most patients who have COVID-19 recover after two to six weeks, research shows that 10–30% of people who have had COVID-19, even with a mild clinical picture, remain with persistent symptoms that have a devastating effect on their quality of life. These symptoms, which most often include fatigue, shortness of breath, chest pain, headache, and cognitive dysfunction, but also others that generally have an impact on everyday functioning, are recognized as a clinical condition called post-COVID syndrome (long COVID). In addition to physical disabilities in people recovering from COVID-19, mental health problems have also been observed, including problems with concentration ("brain fog"), anxiety, depression, sleep disorders, and symptoms of post-traumatic stress disorder (PTSD). In this chapter, we provide a comprehensive review of the current scientific findings identifying post-COVID conditions and their relationship with mental health status.

**Keywords:** long-term effects of COVID-19, mental health, post-COVID, post-COVID-19 conditions, anxiety, epression
