What is a primary symptom indicating scorpion envenomation?

Pain at the site of the sting is a primary symptom indicating scorpion envenomation. Scorpion venom contains neurotoxins that affect the nervous system, often leading to intense local pain at the sting site. This pain can vary in intensity and may be accompanied by other systemic symptoms, depending on the species of scorpion and the amount of venom injected.

Localized swelling can occur as well, but it is not as definitive for diagnosing scorpion stings since swelling can result from various injuries, such as insect bites or other traumas. A skin rash is not typically associated with scorpion envenomation; it may indicate an allergic reaction or a different medical condition. Hemorrhaging is also uncommon with scorpion stings and would suggest more severe systemic complications or other medical issues rather than direct envenomation. Therefore, the immediate and primary symptom indicative of scorpion envenomation remains the pain experienced at the site of the sting.