From researchers in Germany, about 60% of the injected have thromboses. Most of them they do not notice, but they can measure the blood before and after the injection and see if there were chemical signatures. And in the majority, there were such signatures. The source is in german, part of a 4 hour long video where experts were being interviewed for a legal case.

These experts reported also many other side-effects. Like a weird one, where a woman lost her memory.

This is a related study. Extracellular RNA constitutes a natural procoagulant cofactor in blood coagulation (2017) Full text: https://www.pnas.org/content/104/15/6388

An additional factor is the immune system killing the cells that are producing mRNA. These are usually cells of the veins or arteries. And this may cause small internal bleedings. The Pfizer reports showed that the mRNA spreads to every part of the body.

The injected mRNA programs the Ribosomes in the cells to produce spike-proteins. These cause damage as well, and cross the blood-brain barrier. So with a mRNA shot you get the symptoms of Covid for free.