“…Most importantly, studies have shown that at least 20−30% of these patients experienced a lingering psychological condition, known as “brain fog,” characterized by many cognitive impairments, including memory loss, difficulty in concentrating, forgetting daily activities, difficulty in selecting the right words, taking longer than usual time to complete a regular task, disoriented thought processes, emotional numbness, or poor endurance occasionally accompanied by headaches, insomnia, dysgeusia, and anosmia ( Graham et al, 2021 , Garrigues et al, 2020 ). Furthermore, hopelessness, social isolation, insomnia, socio-economic burden, COVID-19 infection, imbalance in daily routines along with pre-existing motor and/or cognitive deficits can significantly affect the emotional and behavioral status, known as “hidden sorrow,” of COVID-19 survivors in long-lasting COVID-19 patients ( Pinto et al, 2020 , Albuquerque et al, 2021 ). Notably, researchers have reported that COVID-19 survivors who experience “brain fog” or “dysexecutive syndrome” gradually developed multi-organ abnormalities, such as cardiac and hepatic dysfunctions ( Nauen et al, 2021 ).…”