The enlargement of the lymph nodes is another one of the widely ignored cancer symptoms. It is true that your lymph nodes become larger and tender and often even painful during an infection. However, when the condition is persistent this might signal the development of a tumor. That is why it is a good idea to see your doctor, if you have noticed a persistent enlargement in the neck, underarm or groin lymph nodes andor swelling in these areas. Browse this site for more information on Causes Signs Symptoms Youtube Channel.