Why do veins collapse during blood?

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  1. #irritation
  2. #particularly
  3. #abuse
  4. #blocked
  5. #common
  6. #context
  7. #conditions
  8. #caused
  9. #temporarily
  10. #injecting
  11. #ideal
  12. #substance
  13. #veins
  14. #where
  15. #response
  16. #injected
  17. #plasma
  18. #internal
  19. #become
  20. #repeated
  21. #swells
  22. #needle
  23. #injury
  24. #lining
  25. #donating