This produces itchy bumps on the skin that can last for weeks. A threatened tarantula spider will eject up to thousands of small hairs from its hind legs that can pierce human skin. Tarantula hairs contain a toxin that can cause a serious skin rash, an allergic reaction, and possibly even anaphylactic shock. Rare complications of brown recluse spider bites include kidney failure and hemolytic anemia, which is anemia due to the destruction of red blood cells. Bites can cause whole-body reactions and can even be fatal. The toxin can also cause other symptoms within 72 hours of the bite including fever, chills, nausea, vomiting, headache, and weakness. The venom may also affect the eyes, causing swelling or drooping of the eyelid and other effects. A scab will form over the site and may leave a scar. However, in others, the toxin will cause swelling, tissue death, and destruction of red blood cells. In most people, the bite will heal in about 1 week. The bite area is first surrounded by a bluish-white ring. Within a few hours, it becomes painful and itchy. The venom can cause whole-body reactions and can even be fatal, especially in very young and old people.īrown recluse spider bites affect the skin and surrounding tissue. The bite of a brown recluse spider is often painless, but it may sting. The toxin can also cause salivation, high blood pressure, constriction of blood vessels, fast heart rate, pain, numbness, tingling, headache, anxiety, sweating, nausea, and vomiting, among other symptoms. This usually occurs in 30 to 60 minutes after the bite. ![]() However, others may suffer severe pain and cramps that spread from the site of the bite to the large muscles of the arms, legs, and abdomen. Some people will not suffer any ill effects. Two small, red spots show where the fangs pierced the skin. The bite from a black widow may go unnoticed or may feel like a pinprick. ![]() However, bites from venomous spiders can cause more severe reactions.īlack widow bites affect the nervous system. Most spider bites cause minor swelling, inflammation, and itching. Some are native to the US, but other species are imported as pets. Tarantulas are large, hairy spiders with a leg span up to 25 cm. They do not usually bite unless threatened. Tarantulas have hairs on their body and hind legs that can pierce human skin and inject a toxin. They often enter homes and hide in dark, quiet places. They hide under rocks and logs and come out at night to hunt. Brown recluse spiders usually only bite when provoked. They are small – their body can be up to 1.5 cm and their leg span up to 4 cm. These spiders are brown and have a dark violin pattern on their back. Their venom kills cells around the site of the bite. The venom of brown recluse spiders causes necrosis (damage and breakdown) of skin and tissue. These spiders build their webs under logs, plants, or rocks, or in dark places in garages and outhouses. ![]() Bites occur mostly in the summer and early autumn, usually if the spider is provoked or if her web is disturbed. These spiders are not very big – their body size is about 1 cm and their leg span about 5 cm. The adult female is jet black with two reddish markings (often in the shape of an hourglass) on the underside of her body. Bites from adult females are the most toxic. The venom of black widow spiders is a neurotoxin (poisonous to the nervous system). brown recluse spiders (found in the southern US).black widow spiders (found in the US and southern Canada).The following North American spiders are venomous: Many spiders bite, but very few are a risk to humans.
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