Add Yahoo as a preferred source to see more of our stories on Google. More than 100 years ago, Americans were becoming deficient in the mineral iodine. It was causing problems like swelling in the ...

Ever since manufacturers began adding iodine to salt in the 1920s, deficiency in this trace element has been relatively rare. And that's a really good thing, considering that iodine is an essential ...

The 13-year-old boy came to the clinic with a rapidly ballooning neck. Doctors were puzzled.Testing ruled out their first suspicion. But further tests pinpointed what they — and the boy — had been ...