Can allergies cause lymph nodes to wax and wane? Chronic over 8 yrs. Tested neg for HIV, HERPES, cancers.

They ALWAYS do that. I'm glad you're health conscious. That's what lymph nodes are supposed to do. Everybody has a few palpable ones that come and go. They're your friends, fighting goodness-knows-what so you never know it attacked. Relax and be thankful for good health.