If there are swollen lymph nodes in areas beyond what you've mentioned, your immune system is reacting to a more widespread rather than a local problem. You may have swollen lymph nodes in other areas of your body that you are not aware of.
If there are other symptoms that you are having, your doctor will use these as clues to help diagnose the cause of your generalized lymphadenopathy.
Do you have any of the following symptoms
recurrent or persistent fevers
joint pains
rashes on your skin
unusual fatigue?