What black mold in your home can really do to your health — and your brain

Black mould can trigger allergy and breathing symptoms, but evidence does not show that ordinary household exposure causes the widespread poisoning or brain damage often attributed to “toxic black mould syndrome”. The distinction matters because mould can affect health, while some claims about its neurological effects remain unproven.

Stachybotrys chartarum grows in persistently damp areas and can produce mycotoxins, but typical indoor exposure has not been shown to deliver harmful doses. People may experience congestion, coughing, wheezing or skin rashes, with greater risks for those with asthma, mould allergies or weakened immune systems. Fatigue and brain fog may also be linked to disrupted sleep, stress or other irritants in damp buildings; addressing moisture and cleaning small patches safely can help.