What are the symptoms of spider bites?

The symptoms of spider bites are as follows: first, there will be obvious swelling, redness, elevated skin temperature at the bite site, sometimes a large sore will form at the bite site, internal blackening, necrosis, accompanied by pain, and may also radiate to other parts. Severe allergic reactions may also be shown, including some symptoms of the whole body, nausea, vomiting, joint pain all over the body, accompanied by headache, fatigue, anorexia, etc. Severe cases can also cause shock such as decreased blood pressure, cold and damp limbs, chest tightness, shortness of breath, etc. If bitten by spiders, they will show symptoms such as chills and fever. If bitten by black widow spiders, severe cases will show stomach cramps and pain. In addition, if the toxicity is strong, it will also be accompanied by myocarditis, hypokalemia and paralytic intestinal obstruction.