Symptoms vary widely and depend on the type of spider but include itching, pain, a rash, muscle pain or cramps, sweating, fever, and chills, breathing problems, anxiety, and high blood pressure.
You may not notice a bite from a brown recluse spider at once, but pain and itching may occur after some hours. A bite from a black widow spider may feel like a pinprick at the time, but puncture marks will be visible, and other symptoms will likely follow, such as muscle cramps and a fever.