Having blood in your urine (hematuria) does not always mean you have an underlying abnormality. It may simply be the result of heavy exercise or a side effect of a drug that needs to be changed.
A sudden drop in blood pressure, also called hypotension, can occur for any number of reasons. It may be due to dehydration or simply rising from your chair too quickly, causing momentary dizziness ...
So you wouldn't want type B blood in your body. (This handy graphic from the Red Cross illustrates the idea.) You also may have heard of blood types being "positive" or "negative." This ...