Ron Rivera has been diagnosed with lymph node cancer following a self check.

"I was stunned," Rivera told Adam Schefter. "But I was angry because I feel like I feel like I'm in best health I've been in."

Rivera felt a lump in early July and saw a doctor a few weeks later. 

Rivera said he plans to continue coaching.

"Doctors encouraged me to do it, too," he told Schefter. "They said, 'If you feel strongly, do it. Don't slow down, do your physical activities.' But everyone keeps telling me by week 3 or 4, you'll start feeling it."