willowtree bark is naturally high in acetylsalicylic acid which most of us know as plain and simple Aspirin. tea made from that helps against many (mild) paincomplaints like headache and musclepain and aspirin is a natural bloodthinner in low doses and it helps in lowering bloodpressureDoes it grow wild where you are? There are loads of good medicinal plants here in Canada (other than the obvious one). I live right next door to the woods and a few years ago I used to go get fungus from birch trees to make a tea which is excellent for many ailments, back pain included. I should get into doing that again.
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edit: corrected the tree species