Mold is also the frequent cause of serious health conditions. With people spending more time indoors than in the past, there is a greater concern about interior conditions. We should be aware of how our environment affects our health. In some cases, people develop severe reactions to mold exposure. This can include fever, difficulty breathing, and even allergic reactions. Allergic reactions can happen immediately or develop over a period of time. People with compromised immune systems or those with chronic lung disease can develop serious infections of the lungs due to molds. It is imperative to act quickly to avoid any adverse reaction.