About Spider Bites
Spider bites can cause both local (near the bite) and systemic (throughout the body) symptoms because of the venom they inject. The causes of the symptoms of spider bites include:
- Venom components: Spider venom contains poisons that can harm the body's cells and systems. For example, black widow spiders have venom that poisons nerve cells, causing symptoms such as paralysis, sharp pain, and numbness. Brown recluse spiders have poison that destroys skin tissue, leading to tissue damage.
Risk factors for spider bites include:
- Geographical location: Black widow spiders are found all over the world, except in polar regions. Brown recluse spiders are primarily found in the Central and Southern United States. They are not commonly found outside the U.S., though related species of recluse spiders exist in Central and South America.
- Environmental factors: Spiders are commonly found in places like garages, agricultural areas, houses, basements, and closets.
- Prevention: Taking general precautions, such as keeping living spaces clean and free from clutter can help reduce the chance of coming across spiders. Additionally, sealing cracks or openings in buildings can help prevent spiders from getting inside.
Remember to consult with your healthcare professional for personalized advice on managing spider bites or potential risk factors.
The most common early symptoms of spider bites include:
- Localized pain and discomfort at the bite site
- Redness, swelling, and itching around the bite area
- A small bump or blister at the bite site
- Warmth in the area around the bite
Symptoms more likely with venomous spiders:
- Nausea and vomiting: Feeling sick to the stomach and throwing up.
- Sweating: Increased moisture on the skin, often from stress or reaction to a toxin.
- Tachycardia: A rapid heart rate, meaning the heart is beating faster than usual.
- Hypertension or hypotension: Blood pressure can either rise (high blood pressure) or, less commonly, drop (low blood pressure).
- Muscle fasciculations: Small, involuntary muscle twitches or spasms.
As spider bites progress or become more severe, other symptoms may occur:
- Dyspnea (difficulty breathing)
- Severe abdominal or chest pain
- Muscle paralysis
- Worsening pain or development of an open sore at the bite site (common with brown recluse bites)
- Fever, chills, or flu-like symptoms
- Rarely, shock and death
For bites from black widow spiders, additional symptoms may include:
- Sustained muscle cramps
- Mental confusion
- Abdominal pain
It's important to note that these symptoms can vary depending on the type of spider and how your body reacts. If you experience a spider bite or suspect you’ve been bitten, it's best to seek medical attention for an accurate diagnosis and appropriate treatment.
Examinations, tests, and procedures commonly performed to diagnose spider bites include:
- History and physical examination: The healthcare provider will gather information about the patient's symptoms, including the appearance of the bite, any pain or itching, and any systemic symptoms such as fever or nausea. They will also perform a physical examination to check the affected area.
- Spider identification: If the spider was observed biting and captured, an expert can identify it to confirm the diagnosis. However, this is rare because spiders are usually not captured at the time of the bite.
- Rule out other causes: Since spider bites do not have specific signs or symptoms, other conditions such as skin infections or cellulitis (a bacterial skin infection that can cause redness, swelling, and warmth-symptoms like a spider bite) need to be ruled out before diagnosing a spider bite.
Additional examinations, tests, and procedures to determine the stage or severity of spider bites may include:
- Laboratory studies: If more serious symptoms are present, lab tests may be done to check for complications such as hemolytic anemia (a condition where red blood cells are destroyed), coagulopathy (problems with blood clotting), or acute kidney injury.
It is important to note that there is no definitive treatment for spider bites besides supportive care. Therefore, the focus is on ruling out other causes and managing symptoms.
The goals of treatment for spider bites include:
- Easing symptoms: The general treatment for spider bites includes cleaning the wound, elevating the affected area, and applying cool compresses to reduce pain and inflammation.
- Preventing infection: If there are signs of infection, topical or systemic antibiotics may be recommended.
- Providing pain relief: For pain relief, analgesics such as opioids, nonsteroidal anti-inflammatory drugs (NSAIDs), and benzodiazepines may be prescribed to relieve pain and muscle spasms associated with spider bites. However, their effectiveness can vary from person to person.
- Addressing systemic symptoms: In severe cases of spider bites with symptoms all over the body or severe skin damage (dermonecrosis), hospitalization may be necessary for observation and treatment.
- In rare cases, antivenom may be a treatment option for certain spider bites, such as black widow bites.
It's important to note that the specific medications, therapies, or procedures recommended can vary depending on the type and severity of the spider bite. It is always best to consult with a healthcare professional for personalized advice.
Medication dosing may be affected by many factors. Check with your healthcare professional about dosing for your individual situation. Other side effects can occur. Check with your healthcare professional or read the information provided with your medication for additional side effect information.