Google is about to take over "am I sick" searches. They're going to do this with smart parsing of the terms you search - sussing out the ones they're able to tell you more about. If, for example, you search for "why does the left side of my head hurt", Google will tell you about the sort of headache you likely have. And why? Why would Google take the time to do this? Because "roughly 1 percent of searches on Google (think: millions!) are symptom related," according to Google's Veronica Pinchin, Product Manager.