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- Health Guide & Symptom Overview
Signs of Mold Illness
Mold illness is not a single classified disease with standard symptoms that indicate health issues. Mold illnesses are allergic and other health reactions to prolonged mold exposure. If you spend most of your time in a damp environment or where humidity levels are high, you may experience congestion, coughing, sneezing, itchy eyes, wheezing, skin irritation, or worsening asthma if mold is present there. It is not just a myth that prolonged exposure to mold growth environments affects health. The World Health Organization has published a proven study based on a review of epidemiological, clinical and toxicological research on indoor dampness and mold. The research proved that mold causes respiratory diseases and allergic reactions.
Clinical Research Verified
WHO Guidelines for Indoor Air Quality
- Clinical Indicators
12 Signs of Mold Illness or Mold Exposure
People who are allergic to dust or have asthma may be affected by mold more than others. Here are some key signs of mold illnesses.
Stuffy Nose
When you spend significant time in a moldy environment, one of the first illnesses that mold spores may cause is nasal congestion and a stuffy nose. People who are sensitive to mold may experience these symptoms faster. When you breathe, mold spores in the air also enter your body through the nasal passage and cause inflammation in the nose. People may experience a runny nose, itchy nose, sneezing, nasal irritation, postnasal drainage and other nose allergies.
Repeated Sneezing
Mold spores are airborne particles and always float in the air. When a person sensitive to dust or mold particles inhales them, these particles may trigger allergic reactions and cause frequent sneezing.
Red Eyes
Mold spores naturally float in the air, and when these particles come into contact with your eyes. These particles also enter your body when you breathe in a moldy environment, and your immune system may react to these particles inside your body. This reaction by your immune system can cause inflammation of the conjunctiva, and you may experience itchy eyes, excessive tears, puffy eyelids, burning, and increased light sensitivity.
Cough and Respiratory Irritation
Mold exposure can also cause respiratory irritation and frequent coughing. This allergic reaction depends on a person’s sensitivity to mold and the amount of time they spend near or in mold growth areas. People who are allergic to mold may experience respiratory tract inflammation, coughing, wheezing, throat irritation, and nasal symptoms.
Wheezing
Mold spores can cause allergic and inflammatory symptoms and irritate the respiratory tract. When people inhale mold and other airborne spores, these pollutants can cause airway inflammation and narrowing, and this may make them wheeze when they breathe.
Breathing Difficulties
Mold also causes shortness of breath because when you inhale airborne mold spores and other mold particles, these spores irritate the respiratory tract. Some people also experience chest tightness and other breathing symptoms.
Sore Throat
Another key sign of mold exposure is a sore throat. When you inhale mold spores, fragments and other airborne particles, these pollutants can irritate the lining of the nose and throat. Some people also experience inflammation, discomfort, sneezing, hoarseness and postnasal drip. The US Environmental Protection Agency has published a study in which they explained that prolonged exposure to mold spores can affect the skin, nose, throat, eyes, and lungs of mold-allergic and non-mold-allergic people.
Skin Rashes
Mold spores can affect skin health, especially in people who already have skin allergies or skin conditions. When people regularly touch mold-damaged materials, they may experience itching, redness, dryness, inflammation, or skin rash conditions.
Aggravated Asthma
People who have asthma already experience breathing difficulties and other related health concerns. When they inhale mold spores or spend significant time in indoor mold environments, their asthma condition may get worse.
Head Pain
Mold-contaminated environments can cause inflammation, facial pressure, headaches, sinus discomfort and other health symptoms. Airborne mold spores and other mold particles can also cause persistent head pain.
Fatigue
Mold in damp areas may make your body tired and fatigued in some cases. Mold spores cause nasal, eye, headache, and respiratory issues, and you may not be able to sleep peacefully when you experience these health symptoms, which may make you feel fatigued.
Symptoms Improve Outside
One of the most important signs of mold exposure is that the symptoms may disappear when you spend your time in other spaces. When you breathe in a moldy environment, you may experience several allergic or mold-related health issues, and when you go away and spend time in a mold-free environment, you feel better.
It is important to note that all of these symptoms do indicate mold exposure, but none of these symptoms is solid proof that mold is present at your property. You may also experience any of these health symptoms due to other health or environmental factors.
- Got Questions?
Frequently Asked Questions
What are common mold exposure symptoms?
Mold can affect your health in several ways, but the symptoms may vary based on individual allergies, immune system, and time in a moldy environment. People with asthma may experience coughing, wheezing, chest tightness, or breathing issues. People who are allergic to mold may experience sneezing, itchy eyes, watery eyes, runny nose, congestion, nasal irritation, and seasonal allergy reactions.
Can mold make you sick?
Yes, mold spores in the air and contact with mold-contaminated materials can affect your health. According to some proven studies by WHO Guidelines 2009, the Institute of Medicine 2004, and CDC/NIOSH 2025, mold can cause respiratory discomfort and allergic reactions.
Are mold symptoms different in children?
In some cases, children may experience different health reactions to mold exposure. They may also experience the same respiratory and allergic reactions to mold exposure as adults. Mold spores can affect children’s health more rapidly because their immune system and lungs are still developing.
Who is more vulnerable to mold?
It is true that some people are more susceptible to mold hazards and damp indoor environments. According to the CDC and WHO, infants, children, people with asthma, mold allergies, chronic respiratory conditions, weak immune systems and elderly people are more vulnerable to mold.
Is black mold more dangerous than other mold?
Not necessarily. If you notice black mold on your property, it means that the mold growing on your property is Stachybotrys chartarum. Mold color does not make any mold more dangerous than others. Excessive or recurring mold of any color or type is dangerous to human health and can damage building materials.
Can mold exposure occur without visible signs?
Yes, mold can grow behind walls, above ceilings, under floors and inside concealed spaces. You may not even know that mold is present on your property and is affecting your health.