DEAR DOCTOR K: I take a daily aspirin to prevent a heart attack. I just read that aspirin can cause macular degeneration. Should I stop taking it?
DEAR READER: No, you shouldn't stop taking aspirin. Medicine — and life — is full of trading off one risk for another. Doctors and medical scientists aren't (yet) smart enough to discover or invent treatments that have absolutely no risks, only benefits. So you have to compare the risk of a treatment against your risks if you don't take it.