What causes lymph nodes on back of head to swell?

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  2. #nodes
  3. #illnesses
  4. #stress
  5. #working
  6. #system
  7. #responsible
  8. #response
  9. #illness
  10. #agents
  11. #infection
  12. #become
  13. #glands
  14. #sinus
  15. #normally
  16. #swollen
  17. #caused
  18. #lymph