Have I Been Exposed to Mold? Common Mold Allergy Symptoms Written by: Ellie Sundali Updated: 2025-03-17 Read time: 10 minutes Indoor air quality is more important than ever, especially if you share a home with someone who is high-risk for contracting the coronavirus. These times are even more dangerous if you or your loved one has been exposed to mold at home. For some, exposure to moldy environments may not cause any symptoms. However, those sensitive to molds can experience severe health effects, including permanent lung damage and infections. Table of Contents Common Mold Allergy Symptoms Sneezing Coughing Itchy eyes Runny nose Congestion Allergic reactions Sore throat Skin rash Headache Asthma attacks You feel itchy What Causes Mold? Mold can grow both inside and outdoors. When outside, mold is essential to the ecosystem, helping to break down plant and animal matter. However, mold can be a severe nuisance when inside your home, especially if you are sensitive to mold. Mold is part of the fungi family and can grow just about anywhere in your home. However, it’s commonly found in cabinets, bathrooms, kitchens, basements, behind drywall, on the ceiling, and near pipes. Additionally, mold can also be found in the air. Although it may start as a small spot, mold can grow and spread rather quickly. In fact, with the right conditions, mold can grow in 24 hours. These conditions include moisture, oxygen, and damp and dimly lit areas. According to the Centers for Disease Control and Prevention, molds release tiny spores that can float in the air. These mold spores can come into your home through your pets, doors, windows, clothing, and shoes, as well as your heating and air conditioning vents. While there are more than 100,000 types of mold that can grow indoors and outdoors, here are some of the most common found in homes: Alternaria – This mold is fuzzy and white with black spots. It can be found in your bathroom, kitchen, carpets, air conditioner, near windows and can also grow in wallpaper and fabrics. Aspergillus – This mold has a powdery look and can be green, gray, or white with dark spots. You can find it in fabrics, basements, attics, and walls. Penicillium – Another fuzzy mold, Penicillium, can be yellow, green, or blue. You can find this type of mold where there is indoor moisture, including in basements and under carpets and insulation. Stachybotrys Chartarum – Also known as black mold, this toxigenic mold is greenish-black. This mold can be found where there is constant moisture — water damage, water leaks, and more — it can grow on paper, fiberboard, and gypsum board. Trichoderma – This mold can be found in soil, paper, stored cereals, decaying wood, and wood. This mold can start out as white or yellow and turn dark green or gray as it matures. Ulocladium – This allergenic mold grows in damp places and can be found on paper, in soil, wood, fibers, dung, textiles, and paint. Typically it is black and needs wetness and water to thrive. Read our review of the 5 Best Air Purifiers For Mold Read more Common Ways People Are Exposed to Mold People can come into contact with mold in several ways, especially in indoor environments where mold thrives. Mold spores are tiny and can easily become airborne, making it easy for people to inhale them. Exposure to mold typically occurs when a person spends time in areas with poor ventilation, excess moisture, or water damage. Here are some of the most common ways people are exposed: Indoor Environments: Mold is commonly found in homes and buildings, especially in damp areas like bathrooms, kitchens, basements, and around windows. If these spaces have moisture problems, such as leaks or humidity, mold can quickly grow. People who spend time in these areas are at higher risk of exposure. Airborne Mold Spores: Mold releases microscopic spores into the air, which can be inhaled when people breathe. These spores often travel through ventilation systems like air conditioners or heating ducts, making it possible to be exposed even if you aren’t in direct contact with moldy surfaces. Contaminated Objects: Mold can attach itself to various surfaces and materials like clothes, shoes, pets, and even furniture. When people bring these contaminated items into their homes, they can unknowingly introduce mold spores into new areas, increasing their exposure risk. Water Damage and Leaks: Areas with ongoing water damage, such as from plumbing leaks, roof leaks, or flooding, provide the perfect environment for mold to grow. People who live in or visit these spaces are more likely to be exposed to higher concentrations of mold spores. Outdoor Mold Exposure: While the focus is often on indoor mold, people can also be exposed to mold outdoors. Mold can grow in leaves, soil, and on decaying organic material like fallen trees and dead plants. Spending time in areas with high mold presence, such as forests or agricultural areas, increases the risk of exposure. In all of these cases, individuals with mold allergies or respiratory issues, such as asthma, are particularly vulnerable to health problems from exposure. Taking precautions to limit exposure, such as improving ventilation, reducing moisture, and cleaning up mold growth, can help mitigate the risks. How Dangerous is Mold in Your Home? As mentioned previously, mold starts as a small spot but will grow quickly. If you notice cracking or peeling of material and smell a musty, earthy scent, you may likely have mold in your home. While some people don’t get sick from mold, others can experience mold allergy symptoms, including a runny nose, sneezing, congestion, itching, watery eyes, asthma, and more. Moreover, mold can also cause significant damage to your home. This includes eating away at your wallpaper, drywall, carpet, floorboards, ceiling tiles, and more. If left untreated, mold can be costly and lead to the collapse of ceilings, and falling walls, and cause your floorboards to cave in. Ultimately, exposure to black mold in the home can be dangerous. Whether you’re sensitive to molds or need to protect your home’s investment, it’s crucial to immediately get rid of mold Here are a few tips to control mold growth in your home: Ensure your home has enough ventilation Fix leaks in your roof, walls, and plumbing Keep humidity levels between 30 percent and 50 percent daily Get rid of the carpet in areas with a lot of moisture, including basements and bathrooms What Should You Do if You’ve Been Exposed to Mold? According to the CDC, there is always some mold around. The first step to prevention is cleaning up the mold and fixing the moisture problem as soon as possible. Luckily, the items you need to clean it are likely already in your home. This includes soap and water, bleach, and hydrogen peroxide solution (which is less harsh than bleach). Be sure to open your windows, don’t mix bleach with ammonia, and wear rubber gloves, boots, and goggles while cleaning. If you have a large amount of mold in your home or you can’t reach it, you must call a professional contractor immediately to have it removed safely. Again, mold can grow and spread quickly in 24 hours, so it’s best to act fast. Although mold doesn’t always cause health problems, it should be removed from your home immediately. Not only can mold cause damage to your home, but it can also be the culprit of severe health concerns for those with mold allergies or respiratory issues. FAQ: Mold Exposure and Allergy Symptoms How can I tell if I have been exposed to mold? Exposure to mold may cause symptoms such as sneezing, coughing, itchy eyes, runny nose, congestion, sore throat, skin rashes, headaches, or asthma attacks. If you notice these symptoms after spending time in a damp or moldy environment, it may be a sign of mold exposure. If symptoms persist, it’s important to consult with a healthcare professional. Can mold grow anywhere in my home? Yes, mold can grow almost anywhere inside your home, but it thrives in damp, dark areas with moisture, such as bathrooms, kitchens, basements, and around pipes. It can also grow on walls, ceilings, carpets, fabrics, and insulation. If you notice water damage or musty smells, you may have mold growing. How does mold spread in my home? Mold spreads through the release of tiny spores into the air. These spores can enter your home through open windows, doors, pets, or ventilation systems like air conditioners and heaters. Once inside, if the conditions are right, mold can begin to grow and spread quickly in just 24 to 48 hours. How dangerous is mold in my home? For some people, mold exposure doesn’t cause any symptoms. However, for individuals with mold allergies, asthma, or compromised immune systems, exposure can lead to severe health effects such as respiratory issues, lung infections, or permanent damage. Mold can also cause significant damage to your home, including destruction of building materials like drywall, wood, and insulation. How can I prevent mold from growing in my home? To prevent mold growth, keep your home well-ventilated, especially in areas prone to moisture like bathrooms and kitchens. Fix any leaks promptly, keep humidity levels between 30-50%, and remove carpet from areas with high moisture. Additionally, use dehumidifiers and ensure that your home is adequately heated and cooled to prevent excess moisture buildup. What should I do if I’ve been exposed to mold? If you suspect you’ve been exposed to mold, the first step is to remove the source of moisture and clean the affected area. Use soap and water, bleach, or a hydrogen peroxide solution for cleaning. Always wear protective gloves, goggles, and boots when cleaning mold. If the mold problem is extensive or difficult to reach, it’s best to call a professional mold remediation contractor. How can I tell if mold is dangerous or toxic? Some types of mold, like Stachybotrys chartarum (black mold), can produce mycotoxins that may pose serious health risks. If you notice mold that is greenish-black and find it in areas with constant moisture (such as from water leaks), it’s essential to have it professionally assessed and removed. For those with allergies or asthma, any exposure to mold can be harmful, so it’s crucial to address the issue as soon as possible. Can I clean mold myself? For small areas of mold growth, you can clean it yourself using soap and water or a mild bleach solution. Be sure to wear gloves, goggles, and a mask to avoid inhaling mold spores. However, if the affected area is large (greater than 10 square feet), or if mold is growing in hard-to-reach areas, it’s recommended to hire a professional to safely remove it. Is mold exposure harmful to children or pets? Yes, children and pets can be more vulnerable to mold exposure. Children’s developing immune systems make them more susceptible to mold-related respiratory issues and allergies. Pets, especially those with respiratory conditions, can also experience health effects from mold exposure, so it’s important to protect them by addressing any mold issues promptly. How long does it take for mold to grow? Mold can start growing in as little as 24 hours if the conditions are right. This includes the presence of moisture, oxygen, and a suitable surface for mold to thrive. If you suspect mold, it’s important to act quickly to prevent further growth and potential health risks. More On Mold What Are The Different Types Of Mold In Your Home? How Can You Avoid Mold Exposure? Air Purifier vs Dehumidifier Vitamins for Mold Exposure: What Helps with Mold Allergies? Does Mold Prefer Heat or Cold? Can You Smell Mold? Understanding What Black Mold Smells Like Content on this site is for reference and information purposes only. Do not rely solely on this content, as it is not a substitute for advice from a licensed healthcare professional. AirPurifiers.com assumes no liability for inaccuracies. Consult with your doctor before beginning any medications or programs.
