Name: Wildman Jackson
How does Aspirin, or any other pain reliever, "know" where to do to do its
job? (I.e. if you take aspirin for a headache, the aspirin moves through the blood,
and then somehow alleviates the pain there, while not affecting other areas.) How does
this pain relieving process work once it gets there?
It doesn't. Any drug like aspirin does what it does wherever it goes, although
some of its effects may be specific because its real target molecules aren't everywhere.
But the basic answer as to why it only acts on your headache, is that you only have a
headache. That's where you have pain, so that's where it relieves pain. Its effects
elsewhere aren't felt by you because you don't have pain there. If you did, the aspirin
would work there, too.
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Update: June 2012