Have a lymph node but why doesn't it hurt? what could this mean?

Get a medical check : Enlarged lymph nodes that hurt are usually due to infection or inflammation. But when the nodes are enlarged yet painless, they need to be checked by your doctor as it can be a sign of cancer if the nodes are clearly enlarged(over 2 centimeter). Further tests and or a biopsy may be required to determine the cause of their enlargment.

Monitoring Centers: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria, viruses, cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.