Lingering symptoms such as crippling fatigue, "brain fog", breathlessness, heart palpitations, chest pain and aching muscles or joints are a grim reality for a subset of people infected with Covid-19.
Women are more likely to be affected than men and it can hit people whose infections were mild or who were asymptomatic.
Many of these Covid "long haulers" feel they are not being listened to by their doctors and have had their distress dismissed.
Dr David Putrino is the director of rehabilitation innovation at Mount Sinai Hospital in New York and works with Covid-19 patients at Mount Sinai's Center for Post-Covid Care.