MoldHelpUSAMold affects people differently, and a lot of what is written about it online is alarming without being accurate. The guides in this section stick to what public health agencies such as the EPA and CDC actually say, and they are not medical advice: if you or someone at home has symptoms, talk to a doctor.
Is black mold dangerous is the place to start. It separates what is known about mold and health from what is often claimed, and explains who tends to be more sensitive, such as people with asthma, allergies, or weakened immune systems. Black mold symptoms covers the reactions people most often report and when they are worth a call to a doctor, and mold exposure testing explains what medical tests and home tests can and cannot show.
If you are trying to work out what is growing on a wall, what black mold looks like and types of mold in houses describe the common household molds and the stains that are often mistaken for them. Our black mold overview ties it together: why it grows, why color alone does not tell you how risky it is, and why fixing the moisture matters more than naming the species.
The practical advice across these guides is consistent. Keep indoor humidity in check, dry anything wet within a day or two, and clean or remove growth with basic protection such as gloves and a mask. Larger areas, and homes where someone is especially sensitive, are better handled by a trained crew working with containment. If symptoms ease when you are away from home and return when you come back, mention that pattern to your doctor; it is one of the more useful clues you can bring to an appointment.
Health & Safety Black Mold Symptoms: What Mold Exposure Can Cause and When to See a Doctor Mold exposure mostly causes allergy-like and breathing symptoms, and some people face higher risk. Here is what the CDC and EPA list, and when to get care. 
Health & Safety Black Mold: What It Is, Why It Grows, and What to Do About It Black mold usually means Stachybotrys chartarum, a greenish-black mold that grows on materials that stay wet. Here is what it is, why it grows, and what to do. 
Health & Safety Is Black Mold Dangerous? What Health Agencies Actually Say Black mold can cause the same allergy and breathing problems as other molds, and some people are at higher risk. Here is what the CDC and EPA actually say. 
Health & Safety Mold Exposure Testing: What Medical and Home Tests Can and Cannot Tell You Testing for mold exposure can mean testing your body or your home. Here is what doctors use, why urine mycotoxin tests are not recommended, and where to start. 
Health & Safety Types of Mold in Houses: The Common Ones and What They Look Like A few mold types show up in most homes: Cladosporium, Penicillium, Aspergillus, Alternaria, and Stachybotrys. Here is how they differ and what to do. 
Health & Safety What Does Black Mold Look Like? How to Recognize It, and What It Might Be Instead Black mold is usually greenish-black and often looks slimy or sooty, but many molds are dark and some dark stains are not mold at all. Here is how to tell.