Published: 23:16 BST, 15 August 2026 | Updated: 19:39 BST, 16 August 2026
First comes the bite – often so painless that victims don't even realize it has happened.
Then, within minutes, the venom gets to work, and the pain begins.
The skin begins to burn and throb, punctuated by electric shock-like zaps. As tiny blood vessels supplying the skin are destroyed, first there is florid bruising and then, in more severe cases, an open, festering wound.
Within a week or two, a hardened black ulcer can form over the dead tissue, eventually falling away as the wound begins to heal.
But in rare cases, the damage doesn't stop at the skin. The venom attacks red blood cells, turning urine Coca-Cola-colored and, in the most serious cases, causing kidney failure and even death.
This is what it can be like to be bitten by a brown recluse – one of America's most dangerous spiders.
And unlike America's other notoriously dangerous spider, the black widow – instantly recognizable by its glossy black body and distinctive red markings – the brown recluse is remarkably easy to miss.
About the size of a quarter, the drab brown spiders spend much of their lives hidden away in cracks, cardboard boxes and other dark, undisturbed corners of the home.
The brown recluse spider, which is common across homes in the South, is one of the most dangerous spiders in the US
Rick Vetter, one of the world's leading authorities on brown recluse spiders, who has studied them for more than 30 years, has a simple answer: 'Smash it.'
And there may soon be more reason for Americans to heed that advice.
The true number of attacks is unknown, but reports to US poison centers suggest hundreds of Americans are bitten or suspected of being bitten every year. In 2024, 827 cases were recorded, including 29 that resulted in major medical complications.
Brown recluses have traditionally been concentrated in the warmer South and Midwest – but there are signs they are gaining a foothold farther north.
They’ve been spotted in at least 10 counties in Michigan, well beyond what experts have traditionally considered the spider's native range.
