Overview
Mold is a fungus that spreads by tiny spores in the air. It grows on wet or damp materials such as drywall, wood, carpets, ceiling tiles, and fabrics. Small amounts of mold are common in the environment, but indoor growth can become a problem when moisture is not controlled. Health effects vary, with some people having no symptoms and others developing irritation or breathing problems.
Key Symptoms
Mold exposure can be linked with sneezing, a stuffy or runny nose, itchy or watery eyes, coughing, wheezing, and throat irritation. In people with asthma, mold may trigger worsening symptoms. Some people may also notice skin irritation after contact with moldy materials. Symptoms often improve when the person is away from the damp or moldy environment, but not always.
Causes and Risk Factors
The main cause of indoor mold growth is excess moisture. Common sources include roof leaks, plumbing leaks, flooding, condensation, poor ventilation, and high indoor humidity. Wet materials that are not dried quickly are more likely to grow mold. Homes, schools, and workplaces in humid climates or with water damage are at higher risk.
Who Is Affected
Anyone can be exposed to mold, but some people are more likely to have symptoms. This includes people with allergies, asthma, chronic lung disease, or weakened immune systems. Infants, older adults, and people living or working in damp buildings may also be more affected. The type and severity of symptoms depend on the person, the environment, and the amount of exposure.
Prevention
Preventing mold starts with controlling moisture. Repair leaks promptly, dry wet areas after spills or flooding, improve ventilation in kitchens and bathrooms, and reduce indoor humidity when possible. Clean and dry water-damaged items quickly, and remove materials that cannot be fully dried. Keeping air flowing and maintaining buildings can lower the chance of mold returning.
Diagnosis and Tests
There is no single test that proves mold is the cause of a person's symptoms. A healthcare professional may ask about symptoms, asthma or allergy history, home or workplace conditions, and whether there has been water damage. In some cases, allergy testing or breathing tests may be used to evaluate related conditions. Building inspection focuses on finding moisture and visible mold rather than routine air testing in every situation.
Treatment Categories
Managing mold-related problems usually involves two parts: reducing exposure and treating symptoms through routine medical care when needed. Reducing exposure may include cleaning small areas of mold, discarding heavily damaged materials, and fixing the water problem. Larger contamination, hidden mold, or repeated return of mold may require trained remediation professionals. People with persistent breathing, allergy, or skin symptoms should speak with a healthcare professional.
Living With It
If you live or work in a damp space, keep a record of leaks, flooding, repairs, and when symptoms occur. Try to avoid spending extra time in areas with visible mold or musty odors until the problem is addressed. Follow workplace or housing reporting procedures if needed. If symptoms continue, medical and environmental evaluation may both be important.
When to Seek Medical Care
Seek medical care if you have ongoing cough, wheezing, shortness of breath, worsening asthma, repeated sinus or allergy symptoms, or a rash after mold exposure. People with weakened immune systems or chronic lung disease should get advice sooner if they think mold is affecting their health. Medical care is also important if symptoms are interfering with sleep, work, school, or daily activities.
When It May Be an Emergency
Get urgent medical help right away for severe trouble breathing, lips or face turning blue, chest pain, confusion, or signs of a severe asthma attack. Emergency care is also needed for a serious allergic reaction, such as swelling of the face or throat or difficulty breathing.