Spider bites are common, and most are not very dangerous. However, some spiders, such as the black widow and brown recluse, are very poisonous. These bites can cause fever, chills, joint pain, stiffness, muscle spasms, and more. Death is rare but possible. If you are bitten by a spider and experience any unusual symptoms, seek medical attention. Follow the links below to find WebMD's comprehensive coverage about spider bites, what they look like, how to treat them, and much more.