Cleaning up dangerous fungus from a wet wall after water leak

How Dangerous Is Damp For Your Health? Dangers Of Damp

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Key Takeaways:

  • Health Risks of Damp: Damp poses significant dangers to health, causing various respiratory problems, allergies, and infections. Exposure to mould and fungi thriving in damp environments can trigger allergic reactions and worsen symptoms in individuals with asthma.
  • Common Causes of Damp: Understanding the causes of damp is essential for effective prevention and treatment. Condensation, arising when warm, moist air contacts cold surfaces, is a frequent cause.
  • Prevention and Treatment: The guide emphasizes the importance of exploring how to prevent and treat damp effectively. It encourages readers to stay informed about the various causes of damp, such as condensation, leaks, rising damp, penetrating damp, and poor ventilation.

Damp is a common problem in many homes and buildings, caused by excess moisture and humidity in the air. Now you may be thinking: is damp dangerous? 

Yes, damp is dangerous because it can lead to health problems and property damage if not addressed promptly. The impact of damp on health and property can be significant.

For example, Damp can cause various respiratory problems, allergies, and infections. Besides, exposure to mould and other fungi that thrive in damp environments can trigger allergic reactions and exacerbate asthma symptoms.

In this guide, we’ll explore how dangerous is damp for your health, its effects, and how to prevent and treat it effectively. So, stay with us by reading the entire content. 

What Are The Main Causes Of Damp?

There are several causes of damp, each with its challenges and potential solutions. Here, we’ll explore some of the most common causes of damp.


Condensation is one of the most common causes of damp. It occurs when warm, moist air contacts a cold surface, such as a window or external wall. 

As the air cools, it can no longer hold the moisture, condensing onto the surface as water droplets. Over time, this can lead to mould and other types of damp.


Leaks are another common cause of damp. Various factors, such as damaged or blocked gutters, broken roof tiles, or pipework, can cause them. 

However, leaks can result in water entering the building, which can cause damage to the structure and create the ideal conditions for mould growth.

Rising damp

Rising damp is a specific type of damp that occurs when the water rises through the ground and into the walls of a building usually leading to noticeably damp walls internally. A lack of damp proof course or a failure of an existing damp-proof course often causes this. It can lead to damage to the structure and can also create the ideal conditions for mould growth.

See related: Damp Survey Services London

Penetrating damp

Penetrating damp is another type of damp that occurs when water enters a building through its external walls. This can be caused by various factors, such as damaged pointing or rendered cracked bricks or flashings. Penetrating damp can lead to damage to the structure and can also create the ideal conditions for mould growth.

Poor ventilation

A lack of ventilation is another cause of damp. Without adequate ventilation, moisture can build up in the air and within the structure of a building. This can create the ideal conditions for mould growth and lead to structural damage, such as rot and decay.

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Is Damp Dangerous?

Yes, damp can be dangerous to human health. Buildings’ damp can lead to mould growth, releasing spores and toxins into the air and causing respiratory problems, allergic reactions, and skin irritation. 

Damp can also make it easier for bacteria and fungi to grow, which can cause lung infections and exacerbate asthma symptoms. Prolonged exposure to damp can increase the risk of health problems, particularly in vulnerable populations such as children, the elderly, and those with pre-existing respiratory conditions. Touching mould spores and other toxic substances can also cause infection and irritation.

So, it’s essential to address damp in buildings as soon as possible to minimise the risk of physical health problems.

How Dangerous Is Damp For Your Health?

Prolonged exposure to damp can also lead to chronic respiratory diseases and increased cancer risk. Here we’ve explored how damp can impact human health and well-being.

Damp For Your Health

Respiratory Problems

One of the most significant health risks of damp is respiratory problems. Damp environments are ideal breeding grounds for mould and other fungi, which can release spores into the air that can trigger allergies and exacerbate asthma and other respiratory conditions. Inhaling these spores can lead to coughing, wheezing, and other breathing difficulties and can cause long-term damage to the lungs. If you find trouble breathing in your home, it could be a sign of excess moisture and should be checked out by a professional.

Allergies and Skin Irritations

Damp also triggers allergies and skin irritations, particularly in people sensitive to mould and other fungi with existing skin problems. Mould spores can cause allergic reactions, including sneezing, runny nose, cracked skin and skin rashes. Prolonged exposure to damp conditions can lead to eczema and other skin conditions.


Damp environments can also promote the growth of bacteria and viruses, leading to infections. People who are immunocompromised or have pre-existing health conditions are particularly susceptible to these infections. Damp conditions can also increase the risk of insect infestations, such as dust mites, exacerbating allergies and respiratory problems.

Eye Irritation

Some people, especially those allergic to mould or other allergens, may have eye discomfort due to damp. Exposure to mould spores can cause redness, itching, and watery eyes. The damp environment can also cause the eyes to become dry and irritated, leading to discomfort and vision problems.

eye irritation


Damp can cause headaches in some people, particularly those sensitive to environmental changes. The high levels of moisture in the damp air can lead to changes in atmospheric pressure, which can cause headaches in some people. Additionally, damp conditions can promote the growth of mould and bacteria, which can contribute to making disturbed mental health and headaches by releasing spores and toxins into the air.

headaches due to damp

Long-term Health Effects

Prolonged exposure to damp environments can have long-term health effects, particularly respiratory health. Exposure to damp increases the risk of chronic respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD). In some cases, exposure to damp has also led to an increased risk of cancer.

Specific Types of Damp and Their Health Risks

Damp can lead to the growth of various harmful microorganisms, including moulds, bacteria, and dust mites. In this section, we’ll look at some specific types of damp and their associated health risks.

  • Black Mould: Black mould, also known as Stachybotrys chartarum, is a type of mould that is particularly dangerous for human health. It can cause various symptoms, including respiratory problems, skin irritation, and even neurological symptoms. 
  • Aspergillus Mould: Aspergillus is a type of mould found indoors and outdoors. When someone has a weakened immune system or pre-existing respiratory problems, it can cause respiratory problems.
  • Cladosporium Mould: Cladosporium is another type of mould commonly found in damp and humid areas, such as bathrooms and basements. People with weakened immune systems or preexisting respiratory conditions may suffer respiratory problems.
  • Stachybotrys Mould: Stachybotrys is a mould often found in damp and poorly ventilated areas, such as bathrooms and basements. It can cause respiratory problems, particularly in people with pre-existing respiratory conditions or weakened immune systems.
  • Dust Mites: Dust mites are tiny creatures found in many homes. They thrive in warm and humid environments, such as bedding, carpets, and upholstery. Exposure to dust mites can cause respiratory problems, particularly in people with allergies or asthma.

Groups at Higher Risk of Health Problems Caused by Damp

While dampn can affect anyone’s health, certain groups are at higher risk of health problems caused by exposure to damp. Here, we’ll take a closer look at these groups and the specific health risks they may face.

Problems Caused by Damp
  • Infants and Young Children: Infants and young children are more vulnerable to the health effects of damp, as their immune systems are not yet fully developed. They are also more likely to spend time on the floor, where they may be exposed to dust mites and other allergens.
  • Elderly People: Elderly people are more susceptible to respiratory problems, and their immune systems may not be as strong as they once were. They are also more likely to have pre-existing medical conditions exacerbated by exposure to damp, such as chronic obstructive pulmonary disease (COPD) and congestive heart failure.
  • People with Weakened Immune Systems: People with weakened immune systems, such as HIV/AIDS or cancer, are more susceptible to infections caused by exposure to damp. They are also more likely to develop severe infection symptoms and complications.
  • People with Pre-existing Respiratory Conditions: People with pre-existing respiratory conditions, such as asthma or allergies, are more likely to experience symptoms when exposed to damp. Mould or dust mites can trigger asthma attacks and exacerbate other respiratory conditions.
  • Pregnant Women: Pregnant women are at increased risk of respiratory infections and other health problems caused by exposure to damp. Their immune systems are naturally suppressed during pregnancy, making them more vulnerable to infections. Plus their respiratory system is more sensitive to environmental irritants.

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Treatment And Prevention of Damp

Damp is a common problem that can be difficult to treat, but several steps can be taken to prevent and manage it. Here, we’ll explore some of the most effective ways to prevent and treat damp in the home.

1. Identify and Fix the Source of the Damp

The first step in treating damp is to identify and fix the source of the problem. This could include fixing leaks, improving ventilation, or repairing damaged gutters or down spouts.

2. Improve Ventilation

Good ventilation is essential for preventing and treating damp. Ensure that your home is properly ventilated by opening windows and using exhaust fans in the bathroom and kitchen. You may also consider using a dehumidifier if you live in a particularly humid climate.

3. Use Mould-resistant Products

Consider using mould-resistant products such as drywall and insulation if renovating or building a new home. These products are designed to resist moisture and prevent the growth of mould.

4. Clean and Dry Affected Areas

You should clean and dry the affected areas as soon as possible if you find any damp affect or mould in your home. You can easily do that by using a water and bleach solution or a commercial mould and mildew cleaner.

5. Seek Professional Help

If the damp is particularly severe, or if you are experiencing respiratory or other health problems symptoms, it may be necessary to seek professional help. A damp specialist can help identify the source of the problem and recommend the best course of action for treating it. Otherwise, more complex respiratory infection symptoms could arise, so it’s important to address these issues before they become more serious.

6. Take Preventative Measures

Finally, taking preventative measures can reduce the home’s damp risk. This may include regular cleaning and maintaining gutters and downspouts, avoiding over-watering indoor plants, and using a dehumidifier in particularly humid areas.

Final Words

Is damp dangerous? In general, damp can be a serious health hazard if left unchecked. Prolonged damp and mould exposure to damp environments can lead to various respiratory problems, allergies, and infections. 

Mould and other fungi that thrive in damp conditions can release spores that trigger an allergic reaction and exacerbate asthma symptoms. To prevent the health risks of damp, you should identify and address the source of moisture, improve ventilation and insulation, and seek professional help. For a free damp survey contact us now. Our damp and mould prevention services will ensure your home is free of these health risks. We are experienced in dealing with all types of damp, including rising damp, penetrating damp and condensation. With our professional advice, you can be sure that the issue is properly addressed and resolved. Contact us today to find out how we can help!

Picture of Jake Fitzgerald - Damp Surveyor

Jake Fitzgerald - Damp Surveyor

Surveyor of Timber & Dampness in Buildings (CSTDB) & ( MRICS ) Chartered Quantity Surveyor

Jake is a qualified chartered quantity surveyor and experienced damp specialist with a unique skill set in thermal imaging. With a focus on effective solutions, Jake combines his expertise in quantity surveying and thermal imaging to accurately assess and address damp-related issues. He utilises advanced technology to identify hidden moisture sources and develop targeted strategies, ensuring comprehensive and cost-effective solutions for his clients. With a commitment to open communication and client satisfaction, Jake delivers cutting-edge solutions that tackle damp challenges head-on.

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