Symptoms of spider bites
Most spider bites will have little effect on people, but some species can cause a reaction due to the venom injected. Spiders do not seek humans to bite because they prefer to save their bites and venom to capture and incapacitate food. Humans are not on any spider's menu, so sometimes spiders will even provide "dry" bites that will be painful to deter further involvement, but not inject venom, leading to non-poisonous spider bites.
There is no definitive list of spider bite symptoms, and they can vary from spider to spider and from the tolerance level of the person bitten. Most spider bites go unnoticed and cause no more than a mild reaction in people, like inflammation of the skin, minor swelling, and itching. Some spider bites, however, can be difficult to heal.