One problem when talking about "body energies" and "blood clots" etc. is that the medical / scientific community and common people sometimes use very different language. In Finland people who have back pains regularly say they have "dislocated" their spine - something which irks medical practitioners who know better to no end!
So one possibility is that these "blood clots" are not actual clots in the blood but just a description used by the archaic practitioners of hocus pocus to describe a phenomena they thought was caused by clots in the blood.
This confusion in terminology is a thing we should always keep in mind when talking with uneducated people and a reason why people should use precise language if they know what they are talking about (and find out if they don't).
The sceptic sites mentioned in earlier post are a good first reference places for people, as long as you take them with a grain of salt and keep in mind they are not a scientific source per se. The Finnish sceptics site has a dictionary like thing about pseudoscience and it has some pretty big inaccuracies when it comes to martial arts for example. Those writers are just common people too with their conceptions and misconceptions.