The first kind , normal reactions, involve pain, redness, swelling, itching, and warmth at the site of the sting. The second kind , toxic reactions, are the result of multiple stings. Five hundred stings within a short time are considered likely to kill because of the quantity of venom involved. As few as ten stings within a short time can cause serious illness. Symptoms of toxic reactions include muscle cramps, headache, fever, and drowsiness.
Allergic reactions are the third type .
They may involve some of the same symptoms as toxic reactions, but may be triggered by a single sting or a minute amount of venom. Any non-local reaction to a single sting should be considered allergic until proven otherwise. Allergic reactions may be local or systemic. An allergic reaction is considered local if it involves only the stung limb, regardless of the amount of swelling. A slight systemic reaction may involve hives and itching on areas of the body distant from the sting site as well as feelings of anxiety and being run down.