In particularly severe cases of prolonged exposure, black mold health effects can be more dangerous. Often compounded by allergic reaction to the black mold spores, these symptoms can include nausea, vomiting, and bleeding in the lungs and nose. Toxic black mold can be costly to remove, and black mold exposure and black mold poisoning can cause a wide range of health problems, some of them severe. Understanding black mold symptoms and health effects can help you and your family identify these indicators and take swift action to protect your health and your home.