What spiders can kill humans?

In Rare cases the black widow's and the brown recluse Spiders can kill humans but it is extremely rare. Most of the time when bitten by one of these spiders you will be fine, even if you don't go see a doctor, however I highly recommend seeing a doctor immediately. Extremely skinny people and people with high blood pressure are more likely to get severe problems/damage from the bite. However, most of the time you will be fine even without treatment (I still wouldn't risk it however).

In reality spiders (kingdom: animal, phylum: Arthropoda (greek for jointed foot/appendage) class: Arachnida, order: Araneae) are our little friends who are a natural pest control (though can be considered pests as well by people with arachnophobia). In other Word even though they're creepy as heck, they help us out quite a lot and demand our respect. I'm not saying don't step on spiders or anything(can't say that cause I'm terrified of them and if necessary I will kill them), I'm just saying unless absolutely necessary, leave them alone.

Thanks