Having blood clots is a very serious condition to have to deal with, as they are very life threatening. I've noticed that a lot of celebrities seem to be getting them these days.
I just heard about another female singer who was stricken with them. They are in her lungs and in her right arm, and she is currently hospitalized, of course.
I've read that blood clots can develop in you if you ride on airplanes a lot, due to the fact that you are sitting for long amounts of time with only a little movement. That may be a reason why so many celebrities are getting them, because some of them have to fly a lot due to their career responsibilities.