How is mold toxic?

Answer 1

Not all mold is toxic. Certain molds excrete toxic compounds called mycotoxins which can be harmful or lethal. But not even all mycotoxins are harmful-penicillin is a mycotoxin for example. Another issue leading to health concerns with mold is how much a person is allergic to certain molds. But harmful molds often grow in indoor spaces that are dark and damp-such as the inside of walls that are not properly insulated, and it is the landlord's responsibility to keep the house mold free.

Below is an article on toxic mold.