Infection is the most common cause of this. Any type of infection in the upper respiratory tract, ears etc. can lead to swollen lymph nodes.
An increase in the neutrophil count also is suggestive of infection.
If the lymph nodes persists for several weeks despite antibiotic therapy, you can consider an ENT evaluation for possible biopsy of the nodes to exclude cancer.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
http://www.straightfromthedoc.com