All that commotion in response to a threat is what shows up as swelling. That can look different depending on the person, but generally, a lymph node bigger than one centimetre across is considered ...

A swollen lymph node can be a bit like your body’s version of a red flag: When one of these bean-shaped clusters of immune ...

However, very occasionally, swollen lymph nodes can be a sign of inflammation deeper inside the body, or more rarely, a sign of cancer, but in this case they are usually much larger than a pea.