Black Mold Symptoms & Dangers
What black mold does to your health, how to recognize it, and where DIY ends and a professional starts.
Symptoms to watch
- Nasal congestion, sneezing, runny nose
- Coughing and throat irritation
- Itchy or watery eyes
- Skin irritation
- Headaches and fatigue
- Aggravated asthma or wheezing
If symptoms lift when you're away and return at home, the house is the likely culprit.
Is it "toxic black mold"?
Frequently not. The label points to Stachybotrys chartarum, which grows on chronically wet drywall and needs lab testing to confirm. Whatever the species, it signals a moisture problem.
When to call a pro
Call if it covers more than ~10 sq ft, keeps returning, follows water damage, or anyone home has breathing trouble. See our process.
FAQ
Black mold questions
It can trigger coughing, congestion, eye and throat irritation, headaches, and worse asthma or allergies — especially for infants, older adults, and those with breathing conditions.
Nasal congestion, sneezing, coughing, itchy eyes, skin irritation, and flaring asthma. A tell-tale sign: they ease once you leave the house.
No. Plenty of dark molds are harmless. "Toxic black mold" usually means Stachybotrys, which lab testing confirms. Either way, over ~10 sq ft calls for a pro.
Small surface spots, occasionally. Anything over ~10 sq ft, tied to water damage, or in the HVAC should be handled professionally so spores don’t spread.
Loveland Mold Guides
More mold resources
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