I heard a really good TED talk about this recently. and it was about mold / pollution in LA. It gave the example of a young woman who came into a hospital multi

I heard a really good TED talk about this recently. and it was about mold / pollution in LA. It gave the example of a young woman who came into a hospital multiple times for a headache, and could not get to the root of the problem. Eventually she saw a specialist and attributed 100% of the cause to the fact that she lived in East LA, had rat droppings, mold in her house which was the cause.