Based on studies prior to COVID, from 90% to 99% of vaccine adverse side effects are not reported to the VAERS database.
And those were studies concerning vaccines with no political connection.
I can imagine that in 2021, many Democrats are reluctant to report side effects of their beloved vaccines.
A good table of COVID vaccine side effects, and all VAERS submissions, are available at the link below
About 43% are minor side effects.
That means 57% are not.
Read a few.
https://www.medalerts.org/vaersdb/findfield.php?TABLE=ON&GROUP1=CAT&EVENTS=ON&VAX=COVID19