Some of the symptoms could be seen as psychological, but I've read several studies that identified brain damage in imaging, lung damage, heart damage, and kidney damage. It's real. I'm writing an article on this, but the research has required so much reading and interpretation it's taking me a long time.
Some long COVID symptoms are loss of the ability to regulate heart rate reliably. This causes difficulty even standing up because you need to rebalance your blood pressure! It's not every single person that gets these problems, but the population burden is and is going to be enormous.
One cardiac study I read found that the closer they looked, the more heart damage they found, much of it subclinical. That subclinical damage is going to be important as you age even if you don't notice it right away.
Puntmann, V.O., Carerj, M.L., Wieters, I., Fahim, M., Arendt, C., Hoffmann, J., Shchendrygina, A., Escher, F., Vasa-Nicotera, M., Zeiher, A.M., Vehreschild, M., Nagel, E., 2020. Outcomes of Cardiovascular Magnetic Resonance Imaging in Patients Recently Recovered From Coronavirus Disease 2019 (COVID-19). JAMA Cardiol 5, 1265. https://doi.org/10.1001/jamacardio.2020.3557
"To our knowledge, this is the first prospective report on a cohort of unselected patients with a recent COVID-19 infec- tion identified from a local testing center who voluntarily un- derwent evaluation for cardiac involvement with CMR. The results of our study provide important insights into the preva- lence of cardiovascular involvement in the early convales- cent stage. Our findings demonstrate that participants with a relative paucity of preexisting cardiovascular condition and with mostly home-based recovery had frequent cardiac in- flammatory involvement, which was similar to the hospital- ized subgroup with regards to severity and extent. Our obser- vations are concordant with early case reports in hospitalized patients showing a frequent presence of LGE,3,25 diffuse in- flammatory involvement,10,26 and significant rise of tropo- nin T levels.4 Unlike these previous studies, our findings re- veal that significant cardiac involvement occurs independently of the severity of original presentation and persists beyond the period of acute presentation, with no significant trend to- ward reduction of imaging or serological findings during the recovery period. Our findings may provide an indication of po- tentially considerable burden of inflammatory disease in large and growing parts of the population and urgently require con- firmation in a larger cohort. "