Signs and symptoms at the site of a scorpion sting may include: 
Pain, which can be intense
Numbness and tingling
Slight swelling
Warmth
 Signs and symptoms related to widespread (systemic) venom effects usually occur in children who are stung and may include: 
Difficulty breathing
Muscle twitching or thrashing
Unusual head, neck and eye movements
Drooling
Sweating
Nausea and vomiting
High blood pressure (hypertension)
Accelerated heart rate (tachycardia)
Restlessness or excitability, or inconsolable crying in children
 As with other stinging insects, such as bees and wasps, it is possible for people who have previously been stung by scorpions to have allergic reactions with subsequent stings. Reactions to these subsequent stings are sometimes severe enough to cause a life-threatening condition called anaphylaxis. Signs and symptoms in these cases are similar to those of anaphylaxis caused by bee stings and can include hives, trouble breathing, and nausea and vomiting.