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Are all Molds Toxic?


Not all molds produce mycotoxins. In fact only several do.

Mycotoxins are the mold’s defense mechanism. Because other molds are competing for the food source the bad molds compete for the food source using the mycotoxins. How the mycotoxins attack other molds goes in a scientific depth not needed here however they do produce toxic, immunosuppressive and carcinogenic substances. These substances not only attack other molds they can attack humans.

Mycotoxins can cause a variety of short term as well as long-term health effects, ranging from immediate toxic response to potential long term carcinogenic effects. Symptoms due to exposure to mycotoxins include but are not limited to dermatitis, cold and flu symptoms, sore throats, headaches, fatigue, diarrhea and impaired or altered immune functions.

Mycotoxins are very small and cannot be detected visually and with a standard mold test. There are several Mycotoxins that can go airborne. These are Ochratoxins, Aflatoxins and Trichothecenes.

The good news they are Doctors who can test to see if these three mycotoxins are in your body by taking a blood and urine sample. If they are can they be tested in your home where most likely they were generated from? Yes they can.

When we test for mold spores they may or may not show up in an air sample. The right conditions are needed for the mold to release it spores. However if the mold is one of the toxic molds the Mycotoxins will show up no matter where the mold is growing or whether it is visible or not.


There are five categories of toxic mold. They are Cladosporium, Penicilium, Fusarium, Aspergillus, and Stachybotrys. Some of the species included in these categories may only cause hay fever-like allergic reactions, while others can cause potentially deadly illnesses. All five of these mold families can be found lurking indoors, in damp spaces. Each has its own particular characteristics that can greatly affect whatever organism or material it contacts. Indoor mold is not always obvious. Mold can manifest on hidden surfaces, such as wallpaper, paneling, the top of ceiling tiles, and underneath carpet.



The toxin produced by Stachybotrys chartarum is the most deadly. It has been tied to diseases as minor as hay fever, to those as serious as liver damage, pulmonary edema, and in the most severe cases, brain or nerve damage and even death. It has also been linked to severe illness in infants. Those with compromised immune systems, small children, and the elderly are highly susceptible to illness when they come in contact with this species of mold. Some symptoms associated with exposure to Stachybotrys include:

respiratory issues
nasal and sinus congestion
eye irritation
sore throat
hacking cough
chronic fatigue
central nervous system issues
aches and pains

Cladosporium, Fusarium, and Penicillium

These mold families have been connected to illnesses such as nail fungus, asthma, and also infections of the lungs, liver, and kidneys. Additionally, Fusarium may cause gastrointestinal illnesses, and even illness which affect the female reproductive system. Chronic cases of Cladosporium may produce pulmonary edema and emphysema.


The least serious of the toxic mold groups, the Aspergillus mold family consists of over 160 species. Only 16 of those cause illness in humans, none of which are fatal if treated.

Toxic molds produce chemicals during their natural growth that are classified as toxins or poisons. The types that have been found to have profound effects on human health, are given the label of "toxic mold."

Toxic molds are all very dangerous if allowed to grow inside the home. Proper precautions should be taken to prevent and eliminate their growth. These measures should include eliminating every material that nourishes the molds, such as old remodeling materials left in a basement. Also, never try to determine the type of mold in your home. Contact a professional to test any mold colony you may find, and consult with your family physician.