Rare, deadly, and often missed, some skin cancers develop in areas that rarely see the sun. Scientists are still learning about them, but here's what we know.

WebMD's COPD Health Center provides in-depth information on chronic obstructive pulmonary disease including symptoms, causes, treatment options, diagnosis, and tests.

A painful sore throat is a signature symptom of an Omicron subvariant called NB.1.8.1, or Nimbus. It now makes up about a ...