Black Mold: Symptoms & Dangers

“Toxic black mold” gets a lot of headlines. Here's the level-headed version: what the symptoms are, what the real risks are, and when it's time to call a professional.

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Common symptoms

Exposure to indoor mold can cause:

Nasal congestion and a runny nose
Coughing and throat irritation
Itchy, watery or irritated eyes
Headaches
Worsening asthma and allergy symptoms

Symptoms are usually worst for infants, the elderly, and anyone with asthma or a respiratory condition. A classic tell: symptoms that ease when you leave the house and return when you're home.

What “toxic black mold” really is

The mold people mean by “toxic black mold” is usually Stachybotrys chartarum. But you can't identify it by color — plenty of harmless molds are also dark. The only way to confirm it is a lab test. What matters more than the species is the amount and the moisture feeding it.

When to call a professional

Call a pro when the affected area is larger than about 10 square feet, when the mold is tied to water damage, or when anyone in the home has respiratory symptoms. Beyond that size, DIY cleaning tends to spread spores rather than contain them.

Black mold FAQs

Is all black-colored mold dangerous?

No. Color isn't a reliable guide — many dark molds are common and low-risk. Only lab testing identifies the species, and the amount and moisture matter more than the color.

Can black mold make you sick?

It can trigger congestion, coughing, eye and throat irritation and headaches, and worsen asthma and allergies — especially in infants, the elderly and people with respiratory conditions.

When should I stop cleaning it myself?

If it covers more than ~10 sq ft, follows water damage, or anyone is having symptoms, call a professional. Disturbing larger areas spreads spores.

How do I know if it's Stachybotrys?

Only a lab test on a sample can confirm the species. We can collect and submit samples as part of an inspection.

Worried about black mold?

Get it identified and handled safely. Call (970) 373-1522 for a Greeley assessment.

Call (970) 373-1522