MOST spiders are totally harmless – but a select few can give you serious trouble if they bite. Complications from some of Earth’s deadliest eight-legged biters include painful erections, ...

In most cases, a poisonous spider bite on humans results in pain, swelling, vomiting, dizziness, headaches, temporary paralysis and, in more severe cases, skin necrosis (the death of skin tissue).

The spider is defensive, and typically delivers "full envenomation" with a bite, potentially even striking repeatedly. Symptoms after a bite might include intense nausea and vomiting, muscular ...

In most cases, a poisonous spider bite on humans results in pain, swelling, vomiting, dizziness, headaches, temporary paralysis and, in more severe cases, skin necrosis (the death of skin tissue).