Such steroids as EQ will increase the amount of red blood cells, which will make the blood thicker and increase the chances of getting a blood clot. In fact, it will happen with any steroid when taken for long enough, and the thing is that EQ is usually taken in long cycles, hence the reason it is mostly associated with this problem. However, it is not exclusive to EQ, and as I mentioned earlier - this will happen with any steroid if you use it for long enough. By giving blood you are making it thinner, so it will become more liquid again because there will be a higher ratio of while blood cells.