1 doctor weighed in:

I think I got bitten by a spider? How dangerous is a spider?

1 doctor weighed in
Dr. Richard Bensinger
Ophthalmology

In brief: Usually not much

The vast majority of spider bites are from essentially harmless species that may cause a little local redness and swelling but nothing else.
The two dangerous ones: 1) black widow found in woodpiles mostly (a rare problem) and 2) brown recluse found in basements and house corners. This one can cause a necrotic, enlarging wound which needs medical attention.

In brief: Usually not much

The vast majority of spider bites are from essentially harmless species that may cause a little local redness and swelling but nothing else.
The two dangerous ones: 1) black widow found in woodpiles mostly (a rare problem) and 2) brown recluse found in basements and house corners. This one can cause a necrotic, enlarging wound which needs medical attention.
Dr. Richard Bensinger
Dr. Richard Bensinger
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