Most NSAIDS can cause internal bleeding, as they are harsh on the stomach lining. Most of the newer ones are also tied into heart problems as well as liver problems. Probably why. I doubt the occasional pill would do this, it's usually regular use that does it and especially overuse, but if you're on BP meds and assuming you actually need them -- keep in mind most BP problems can be dealt with through changes in exercise, diet and lifestyle but docs tend to go the easy route which is to give you BP meds as they don't really know much about the other things and it also keeps you their customer forever as you have to continually get refills and exams so it's good business for them, but in many cases the situation is too severe for that and you do need meds -- these side effects being possible makes it safer not to use them. Acetaminophen, while highly liver toxic if you use regularly or take too many, doesn't have these problems and is the only NSAID that doesn't (Tylenol is one brand of acetaminophen). I have this problem too as I had a bleeding ulcer decades ago but am generally advised not to take anything by acetaminophen except for occasional use of the others.