Dr. Linus Pauling, MD, who recommended taking large doses of vitamin C, said that an aspirin a day will decrease your chance of a heart attack, but increase your chance of a stroke. These are all blood thinners. We all have to be careful of what we take for medications.
Pauling is no doubt right.
Aspirin is most certainly a blood thinner.
I'm not suggesting running out and taking aspirin (although I note that the President's doctors have him take 81 mg a day; I presume he is not getting faddish care.
I am suggesting that if you have a headache or need painkillers once in awhile, take aspirin, not the other stuff.