Being infected by Covid-19, loss of smell or anosmia, anxiety, depression, headache, etc. are just some of the most common psychological and neurological symptoms in mild and severe cases. The researcher at University College London, Jonathan Rogers, conducted an investigation which surprised them that out of 215 studies of covid-19 from 30 countries, which included a total of 105,638 people with acute symptoms of the disease. "It appears that COVID-19 affects mental health and the brain is the norm, rather than the exception." Anosmia, weakness, fatigue, loss of taste, muscle pain, depression, anxiety, and headache are some of the most common symptoms.