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Medical Dictionary:
Poisons
Poisons aren't always marked with a skull and crossbones; even common household items can cause overdose or toxic shock. The Poisons Dictionary on HowStuffWorks defines the poisonous or toxic ingredients in these substances and identifies symptoms associated with them. Learn what to do in case of poisoning, when to attempt home treatment, what to tell Poison Control and what to expect at the emergency room.
Featured Poisons:

Black widows are found throughout the U.S., but predominantly in the South and West. They are usually found in barns, sheds, stone walls, fences, woodpiles, porch furniture, and other outdoor structures.

Ticks can be the source of several diseases including: Rocky Mountain Spotted Fever, Lyme Disease, Tick Paralysis, Colorado Tick Fever, and Tularemia.

Bee, wasp, and yellow jacket stings give off a substance called venom.

Most people stung by a wasp will have only skin symptoms. Those allergic to wasps, however, may have more serious reactions.

 
The Poisons Dictionary Library: