It’s well known that even a mild case can cause heart, long, circulatory and even brain damage although these injuries are generally suffered by the unvaccinated.

https://www.hopkinsmedicine.org/health/conditions-and-diseases/coronavirus/heart-problems-after-covid19

https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/coronavirus-long-term-effects/art-20490351

https://my.clevelandclinic.org/health/articles/23011-covid-heart-damage

https://khn.org/morning-breakout/study-finds-link-between-covid-and-long-term-brain-injury-risks/