why do thorns from blackberry plants hurt?

imported_Amber

New member
I ask this because I just stepped on some and there are no thorns stuck in my foot, but my foot its throbbing in pain! I will be fine since I tend to always get pricked by these thorns but why does it hurt soo much after you've been pricked with it? and it turns red too
Well anything hurts that peirces your body, how ever It only burns and swells and turns red with thorns from plants, do they contain some poisonous chemical in them that is meant to cause irritation?
 
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