Without the spider as evidence, it is difficult to be sure what is causing the problem. Initially, there is little to be done other than calming the victim, and applying cold to the site of the bite for reduction of pain. Antibiotic therapy usually cures the patient. They all love the night, as most spiders also do, and hide by day. Their pincers are for holding and tearing apart their prey.
Insects are their primary source of food.
Most victims report no more pain than a vicious bee sting. An attack of the species Centruroides may be different. In North America only the Centruroides is a known killer of humans. They are usually straw-yellow or yellow with dark longitudinal stripes, and reach from two to 7.5 centimeters in length. Their pincers are long and slender as opposed to bulky and lobster-like.