There is a whole range of symptoms, one nastier than the other that accompany the bite of a dangerous spider: digestive troubles such as nausea and vomiting, headaches and fever, not to mention the local discomfort manifested as pain and itchiness. The bite of the same poisonous spiders may trigger different reactions in separate individuals, since personal sensitivity to the toxins in the venom matters a lot. In order to avoid direct contact with spiders indoors, you can use special sticky traps that will drastically lower the risk of being bitten by a venomous species. For such cases spider identification is not necessary; but we cannot say the same thing about the widow spiders that require the immediate use of an anti-venom. This precaution measure is only valid in case the spider bite is located at the level of the arms or legs. One other thing you can do is to put some ice or cold water on the bite in order to reduce the discomfort and alleviate the pain. You should be concerned when the symptoms do no improve within 24 hours and there is numbness or increase in pain. As their very name suggests they enjoy very retreated corners where they are not bothered by light or intruders: cellars, garages, hallways or any other dark house area. Moreover, brown recluse spiders are very likely to be found behind paintings or under desks and tables. Brown recluse spiders are also very special by the way they have the eyes located on the body. The treatment for special spider bites can only be provided in professional medical institutions since the risk the victim faces in most such cases is necrosis. What is the first aid procedure in case of spider bites? It all depends on the body part where you've been bitten; when the spider bites occur on the arm or the leg, tie a bandage right above the bite so as to prevent the spreading of the venom. Experts in the field often say that spider identification is tricky since very many species resemble each other, and the venomous and the non-venomous ones are found in a complex who's who relationship. Presently, there are all sorts of devices that allow people to catch and analyze the spiders that live in their homes so as to find out whether they are poisonous or not.