My guess is that you either searched for something (for example) related to a sports injury or some sort of pain, or you where nearby somebody that did it.
Many cases of this are just clustering.
Another option would be if they're integrating something like Close-Up data.
Close-Up is a company that collects prescription data and sells it to different marketing companies. They usually collect what doctors prescribe, so they can tell if pharma marketing efforts are working. I'm not sure how deeply entrenched they are in the US (or how HIPPA compliant they are).
Many cases of this are just clustering.
Another option would be if they're integrating something like Close-Up data.
Close-Up is a company that collects prescription data and sells it to different marketing companies. They usually collect what doctors prescribe, so they can tell if pharma marketing efforts are working. I'm not sure how deeply entrenched they are in the US (or how HIPPA compliant they are).