Scorpion Stings Underlying Cause
The venom from the scorpion sting causes irritation to the skin. The venom from a poisonous scorpion may cause serious symptoms, including an allergic reaction. Most scorpions in the US contain small amounts of venom that will not harm humans. Some species of scorpion in Arizona have poisonous venom that can affect the central nervous system, but these reactions are very rare.
The more poisonous scorpions include the:
- Arizona Bark scorpion
- Yellow scorpion
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- LoVecchio F, McBride C. Scorpion envenomations in young children in central Arizona. J Toxicol Clin Toxicol. 2003;41(7):937-40. 
- Nugent JS, More DR, Hagan LL, Demain JG, Whisman BA, Freeman TM. Cross-reactivity between allergens in the venom of the common striped scorpion and the imported fire ant. J Allergy Clin Immunol. 2004 Aug;114(2):383-6.