The Good News
Spiders are great for pest control. They will help to catch all sorts of insects including roaches. The vast majority of the most common house spiders rarely, if ever, actually bite people. There are about 40,000 different spider species on earth and only about 12 can actually cause harm to a human. In the United States, there are only two types of spiders that need to be worried about: the brown recluse and the black widow.
The Brown Recluse Spider is brown with a fat body and skinny legs. They look like they have a brown violin marking on their back and they are about 5/8 inches in size. They are nocturnal and eat other bugs like cockroaches and crickets. The Black Widow spider are most recognized by the red hourglass shape on their back. They are about 3/4 inches in length and 3/8 inches in diameter. Both the Brown Recluse Spider and the Black Widow Spider only bite humans in self defense.