Tissue tells: Lymph nodes "taste" the lymph to see if anything bad is there like bacteria, viruses, cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge/harden in response to the inflammation created when they react. They will eventually shrink whereas a tumor will not. A biopsy is the easiest way to tell to be 100% sure and can be done easily in the office.
Answered 5/27/2013
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