The<unk>  of a<unk> <unk> is due to the effect of its venom. A<unk>  envenomation occurs whenever a<unk>  injects venom into the skin. Not all<unk><unk>  inject venom – a dry<unk>  and the amount of venom injected can vary based on the type of<unk>  and the circumstances of the encounter. The mechanical injury from a<unk> <unk> is not a serious concern for humans. Some<unk><unk>  do leave a large enough wound that infection may be a concern. However, it is generally the toxicity of<unk>  venom that poses the most risk to human beings; several<unk> s are known to have venom that can cause injury to humans in the amounts that a<unk>  will typically inject when biting. Only a small percentage of species have<unk>  that pose a danger to people. Many<unk> s do not have mouthparts capable of penetrating human skin. While venoms are by definition toxic substances, most<unk> s do not have venom that is toxic to humans (in the quantities delivered) to require medical attention. Of those that do, fatal outcomes are exceedingly rare.<unk>  venoms work on one of two fundamental principles; they are either neurotoxic (impairing the nervous system) or necrotic (dissolving tissues surrounding the<unk> . In some cases, the venom targets vital organs and systems.
Pathophysiology of spider bites
Hypoalgesic effect of swearing
Genetics of synesthesia
Inflammatory reflex
Cutaneous perforating disorders
Pain in animals
Allergic reactions to anesthesia
Recurrent painful ophthalmoplegic neuropathy