The latest COVID variant is causing a distinctive symptom: a sore throat so severe it's nicknamed "razor blade throat." Some patients report a sharp, stabbing pain when they swallow, often at the back of the throat. Because of that, the new variant is informally being called "Nimbus," a name that refers to a jagged type of storm cloud.

New COVID variant Nimbus causes excruciating 'razor blade throat' symptoms. Learn about this painful strain spreading across the U.S. and key warning signs.