Can Mold Grow in Your Lungs Illustration

Can Mold Grow in Your Lungs? (2023)

by | Updated: Sep 22, 2023

The question of whether mold can grow in the lungs may seem unusual, but it’s an important one given the ubiquity of mold in our environment.

While most healthy individuals can fend off mold spores without issue, those with compromised immune systems or pre-existing lung conditions are at a greater risk.

The condition known as pulmonary mycosis occurs when mold or fungal spores colonize the lungs, potentially leading to severe respiratory issues.

Can Mold Grow in Your Lungs?

Yes, mold can grow in the lungs, but this is relatively rare and usually occurs in individuals with compromised immune systems or pre-existing lung conditions. The condition is known as pulmonary mycosis and can be caused by various types of fungi, including molds. Symptoms can mimic those of bacterial pneumonia, and diagnosis and treatment often require specialized medical care.

Mold in Lungs Aspergillosis Vector Illustration

What is Mold?

Mold is a type of fungus that grows in multicellular filaments called hyphae. Unlike plants, molds lack chlorophyll and cannot photosynthesize, meaning they need to absorb nutrients from other organic materials.

Molds are found virtually everywhere in the environment, both indoors and outdoors, and play a critical role in breaking down organic matter.

They reproduce through both sexual and asexual means, often through the dispersal of spores, which are highly resilient and can survive in extreme conditions.

Molds thrive in damp, humid, and warm environments. They can grow on a variety of surfaces, including wood, paper, carpet, food, and insulation.

While many molds are harmless, some can produce mycotoxins that are poisonous to humans and animals.

Additionally, molds can trigger allergic reactions and respiratory issues, especially in individuals with weakened immune systems or mold allergies.

Type of Mold That Can Affect the Lungs

Several types of mold can potentially affect the lungs, particularly in people with compromised immune systems or pre-existing lung conditions.

Some of the most common molds that have been associated with respiratory issues include:

  • Aspergillus: This is perhaps the most commonly identified mold in cases of pulmonary mycosis. It can cause a range of diseases collectively known as aspergillosis. The most severe form, invasive aspergillosis, can spread to other organs.
  • Cladosporium: Commonly found in outdoor air, this mold can also grow indoors on surfaces like textiles, wood, and paint. While usually not as dangerous as Aspergillus, it can cause respiratory issues.
  • Penicillium: While some species of this mold are used in food and drug production (e.g., penicillin), certain strains can affect the respiratory system, particularly in people with asthma or weakened immune systems.
  • Alternaria: This mold is a common allergen and can trigger asthma symptoms or other respiratory issues when inhaled.
  • Mucor and Rhizopus: These molds are commonly found in soil and decaying organic matter and can cause a severe infection known as mucormycosis, which can affect the lungs and even spread to the brain.
  • Stachybotrys Chartarum: Also known as “black mold,” this type of mold produces mycotoxins and has been associated with health issues, although it is less commonly found in the lungs compared to types like Aspergillus.
  • Histoplasma: This mold is usually found in soil that contains bird or bat droppings and can cause a condition known as Histoplasmosis, which can affect the lungs and other organs.
  • Cryptococcus: Commonly found in soil and bird droppings, this yeast-like fungus can cause Cryptococcosis, which starts in the lungs and can spread to the nervous system.
  • Coccidioides: Found in arid regions of the U.S. like the Southwest, this mold can cause Valley Fever, a lung infection that can occasionally become severe.

Note: Individual susceptibility, strain virulence, and exposure levels contribute to the severity of lung infections caused by these molds. Proper diagnosis and treatment are crucial for managing respiratory issues related to mold exposure.

Symptoms of Mold in the Lungs

The symptoms of mold exposure in the lungs can vary widely depending on the individual, the type of mold involved, and the severity of the infection.

It’s essential to consult with a healthcare provider for an accurate diagnosis and appropriate treatment.

Here are some common symptoms that may suggest the presence of mold in the lungs:

  • Persistent Cough: A long-lasting, sometimes painful, cough that may produce mucus.
  • Shortness of Breath: Difficulty in breathing or feeling as if you can’t get enough air, especially during physical activities.
  • Wheezing: A high-pitched whistling sound when breathing, particularly noticeable during exhalation.
  • Chest Tightness or Pain: A feeling of pressure or discomfort in the chest area.
  • Fever: Elevated body temperature, sometimes accompanied by chills.
  • Fatigue and Weakness: Feeling excessively tired or having a lack of energy.
  • Respiratory Complications: In more severe cases, symptoms could escalate to pneumonia-like conditions, with severe breathing difficulties requiring medical intervention.
  • Allergic Symptoms: Runny or stuffy nose, sneezing, and itchy or watery eyes can also accompany lung symptoms, especially in those allergic to mold.
  • Cognitive Changes: Though less common, some individuals report difficulty focusing or memory issues, potentially due to the systemic nature of the infection.
  • Skin Rash: Some molds can cause skin reactions, and while this is not a lung symptom per se, it may be a clue to mold exposure if respiratory symptoms are also present.
  • Weight Loss and Loss of Appetite: In chronic or severe cases, you may experience unintentional weight loss or a decreased appetite.
  • Night Sweats or Unexplained Sweating: Excessive sweating without physical exertion, sometimes occurring at night.

In severe cases, mold in the lungs can lead to systemic infections affecting other organs, and immediate medical intervention is essential.

Diagnosis usually involves imaging tests like X-rays or CT scans and may also include taking samples of lung tissue or mucus for microscopic examination and culture tests.

Treatment often involves antifungal medications and may require hospitalization in severe cases.

What is Aspergillosis?

Aspergillosis is a fungal infection or allergic response caused by the Aspergillus genus of molds. Aspergillus spores are ubiquitous in the environment, so most people inhale these spores every day without developing aspergillosis.

However, individuals with weakened immune systems or pre-existing lung conditions are at a higher risk of developing health problems due to Aspergillus.

Types of Aspergillosis

  • Allergic Bronchopulmonary Aspergillosis (ABPA): This occurs mainly in people with asthma or cystic fibrosis. It’s an allergic reaction that exacerbates respiratory symptoms and can result in bronchiectasis over time.
  • Aspergilloma: Also known as “fungus ball,” this form occurs when a clump of mold forms a ball in the lung cavities, usually in pre-existing cavities created by conditions like tuberculosis. Generally, it does not spread to other parts of the body but can cause coughing up blood.
  • Chronic Pulmonary Aspergillosis: This is a long-term condition that can last for months or years. It often occurs in people who already have other lung diseases like tuberculosis.
  • Invasive Aspergillosis: This is the most severe form and occurs when the infection spreads from the lungs to other organs, including the brain, heart, and kidneys. It is particularly dangerous and can be life-threatening, requiring immediate medical intervention.


Symptoms can vary depending on the type of aspergillosis and may include cough, fever, chest pain, and difficulty breathing.

In severe cases, there may be hemoptysis (coughing up blood), weight loss, and fatigue. Allergic forms might trigger asthma-like symptoms such as wheezing and shortness of breath.

Diagnosis and Treatment

Diagnosis often involves a combination of imaging tests like X-rays or CT scans, sputum cultures, and blood tests. In some cases, a biopsy may be needed.

Antifungal medications like voriconazole are commonly used for treatment. In severe cases, particularly of invasive aspergillosis, hospitalization, and intravenous antifungal agents are required.

Note: Because of the potentially severe nature of this condition, early diagnosis and treatment are crucial. Consult a healthcare provider if you suspect you may have aspergillosis.

How to Prevent Mold in Your Lungs

Preventing mold exposure to protect your lungs involves both environmental controls and individual precautions. Here are some key strategies:

Environmental Controls

  • Humidity Control: Maintain indoor humidity levels between 30-50% using dehumidifiers or air conditioners.
  • Ventilation: Ensure good air circulation in high-humidity areas like bathrooms and kitchens. Use exhaust fans and open windows when possible.
  • Mold Inspection: Regularly check for signs of mold in damp areas like basements, bathrooms, and attics. Also inspect after water damage from leaks or floods.
  • Cleaning: Clean and disinfect surfaces that are prone to mold growth, using mold-killing solutions like bleach or hydrogen peroxide.
  • Water Leaks: Promptly repair any leaks in your home’s roof, walls, or plumbing to minimize moisture accumulation.
  • Air Filtration: Use High-Efficiency Particulate Air (HEPA) filters in your home’s ventilation system to capture mold spores.
  • Outdoor Precautions: When doing yard work or spending time in wooded areas, wear a mask to reduce inhalation of mold spores.

Individual Precautions

  • Personal Protective Equipment (PPE): When cleaning mold or in environments where mold exposure is likely, wear appropriate PPE such as masks, gloves, and eye protection.
  • Avoid Certain Activities: If you are susceptible to mold infections, avoid activities that disturb soil, compost, or decaying organic matter, where mold is likely to be present.
  • Be Cautious in High-Risk Environments: Be extra careful in mold-prone environments like construction sites, greenhouses, and agricultural settings.
  • Consult Healthcare Providers: If you have a compromised immune system or respiratory issues, consult your healthcare provider for personalized advice on mold exposure and possibly, prophylactic antifungal medications.
  • Lifestyle Choices: A healthy diet, regular exercise, and avoiding smoking can help boost your immune system, making you less susceptible to infections, including those caused by mold.
  • Knowledge and Awareness: Be informed about the signs and symptoms of mold-related respiratory issues, and seek medical advice if you suspect exposure.

By implementing these measures, you can significantly reduce the risk of mold growing in your lungs.

Keep in mind that individuals with compromised immune systems, pre-existing lung conditions, or other risk factors may need to take additional precautions.

Remember: Always consult with a healthcare provider for diagnosis and treatment if you suspect a mold-related health issue.

FAQs About Mold Growth in the Lungs

How Can You Tell if There’s Mold in Your Lungs?

The presence of mold in your lungs can manifest through various symptoms like persistent cough, wheezing, shortness of breath, chest tightness, and in severe cases, fever and unexplained weight loss.

However, these symptoms are not specific to mold-related lung issues and could indicate other respiratory problems.

To confirm mold presence, a healthcare provider may perform imaging tests like X-rays or CT scans, as well as sputum cultures or blood tests. In some cases, a lung biopsy may be necessary.

What’s the Outlook for People with Mold in Their Lungs?

The outlook for people with mold in their lungs varies depending on the type of exposure, underlying health conditions, and promptness of diagnosis and treatment.

Individuals with healthy immune systems often recover without long-term effects.

Those with chronic respiratory issues or immune system deficiencies face more risks, including chronic infection and, in severe cases, systemic complications.

Note: Timely intervention with antifungal medications and supportive care usually improves the prognosis.

What to Do if You Find Mold in Your Home?

If you find mold in your home, it’s important to address it immediately to minimize health risks. Small areas of mold can often be handled with household cleaning agents like bleach or hydrogen peroxide.

For larger infestations or mold in HVAC systems, professional remediation is recommended.

Preventive measures include fixing water leaks, maintaining low humidity levels, and ensuring proper ventilation.

How Do You Get Rid of Mold Spores in Your Lungs?

Eliminating mold spores from your lungs often requires medical intervention. Treatment typically involves antifungal medications, which may be administered orally or intravenously, depending on the severity of the condition.

Inhalers may also be prescribed for symptom relief.

It’s crucial to consult a healthcare provider for accurate diagnosis and appropriate treatment, especially if you are experiencing persistent respiratory symptoms.

What Does a Mold Cough Sound Like?

A mold-related cough is often persistent and may be dry or produce mucus. The sound itself is generally not distinct enough to differentiate it from a cough due to other respiratory issues like colds, asthma, or pneumonia.

However, if you experience a persistent cough alongside other symptoms like wheezing, shortness of breath, or chest tightness, it may be an indication of mold exposure or other respiratory problems requiring medical evaluation.

How Long Does It Take for Mold to Cause Health Problems?

The time it takes for mold to cause health problems can vary significantly from person to person, depending on factors such as the type of mold, the level of exposure, and the individual’s overall health and sensitivity to mold.

Some people might experience symptoms almost immediately upon exposure, while others may take days, weeks, or even longer to show symptoms.

In cases of long-term exposure, symptoms may gradually develop over time and become chronic.

Can Your Lungs Recover from Mold Exposure?

The ability of your lungs to recover from mold exposure largely depends on the severity of the exposure, the promptness of treatment, and your overall health.

In most cases, individuals with healthy immune systems and no pre-existing lung conditions will recover without long-term effects once the exposure is eliminated and appropriate treatment is administered.

However, in severe cases or for those with pre-existing health conditions, full recovery may take longer and may require ongoing medical treatment.

Always consult a healthcare provider for diagnosis and a treatment plan tailored to your condition.

Final Thoughts

The risk of mold growth in the lungs is relatively low for the general population but should not be ignored.

For those with compromised immune systems or pre-existing respiratory conditions, exposure to mold spores can lead to severe complications that mimic bacterial pneumonia.

Early diagnosis and specialized medical treatment are essential for effectively managing this condition. Awareness and understanding of this issue are crucial, especially for people in high-risk categories.

Written by:

John Landry, BS, RRT

John Landry is a registered respiratory therapist from Memphis, TN, and has a bachelor's degree in kinesiology. He enjoys using evidence-based research to help others breathe easier and live a healthier life.


  • Sharma BB. Molds and the lungs. Lung India. 2010 Oct
  • Borchers AT, Chang C, Eric Gershwin M. Mold and Human Health: a Reality Check. Clin Rev Allergy Immunol. 2017 Jun
  • Mendell MJ, Mirer AG, Cheung K, Tong M, Douwes J. Respiratory and allergic health effects of dampness, mold, and dampness-related agents: a review of the epidemiologic evidence. Environ Health Perspect. 2011 Jun
  • Fosses Vuong M, Hollingshead CM, Waymack JR. Aspergillosis. [Updated 2023 Feb 22]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-.
  • Hardin BD, Kelman BJ, Saxon A. Adverse human health effects associated with molds in the indoor environment. J Occup Environ Med. 2003 May

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