A spider bite occurs when a spider's fangs penetrate the skin, injecting venom. Most spider bites are harmless and may cause minor symptoms like redness, swelling, or itching. However, some spiders, such as the black widow or brown recluse, can deliver venom that leads to more serious health issues. Symptoms of a spider bite can vary depending on the type of spider and the individual's reaction. Common signs include pain at the bite site, muscle cramps, and in severe cases, systemic reactions. If a bite appears to worsen or shows signs of infection, medical attention may be necessary.