Mold toxin exposure by inhalation and ingestion has significant health consequences for humans. In this article, we discuss the sources of these everyday toxins and their relevance to patient health. The effects of mycotoxins can present across all body systems, and the resulting symptoms can be acute, cumulative, and chronic. These effects can occur discretely, but they can also present alongside other clinical entities. It is important for the clinician to recognize the phenomenon of mycotoxin illness, because as a primary cause, it does not resolve with current standards of care for conditions secondary to it.