Doctors from the Long Island Jewish Hospital found in a study that some people who take pain killers for headaches get headaches more frequently.
The effect, known as a "rebound", happens in about 5% of the patients who experience migraine headaches. The frequency of headaches increases when they take pain medication.
Pain killers can CAUSE headaches. Oh the irony. Unfortunately, not enough irony to milk this minor story into a full-blown feature article, but enough to cause a sly grin to appear on a newscaster's face.
Now that this is out in the open I suspect that any day now a study will reveal that the main ingredient in toothpaste is sugar and that rats cause cancer.