Most spiders are harmless.
Though spiders may seem creepy and crawly, most are harmless and rarely bite. There are thousands of types of spiders, and while all produce some amount of venom, only a few are dangerous to humans. Those that are, however, can produce serious symptoms that can require emergency treatment.
Pain
Most spider bites produce pain at the bite site either immediately or shortly after the bite. Later, you may develop an itching or burning sensation. Bites of certain species, such as the black widow, may produce pain in other sites in the body, such as abdominal pain, joint and muscle pain, and headaches.
Open Wounds
Many spider bites may cause initial redness and swelling at the bite site that will subside within a few hours or a day or two. However, some bites, such as those of the brown recluse, will cause skin ulceration and an open wound. According to the California Poison Control System (CPSC), brown recluse bites produce an ulcerated area on the skin within 24 to 48 hours due to a cytotoxin that destroys tissue. The hobo spider is another spider that can cause a slow-healing open wound, according to the CPSC.
Feelings of Illness
Spider bites may produce signs and symptoms of illness, such as fever, chills, and nausea and vomiting. Other symptoms may include a rash and swollen lymph nodes.
Other Symptoms
Though most spider bites heal without treatment or with minor first aid, some bites can progress and produce serious symptoms. These include: heart palpitations, breathing difficulties, increased blood pressure, severe muscle cramps and spasms, anemia and kidney failure. If you experience these symptoms after a spider bite, you should seek medical treatment.
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