Mould exposure symptoms: spotting mould at home and in food

A musty bedroom, recurring condensation or mouldy food can leave you wondering whether mould exposure is affecting your health. Damp and mouldy buildings are associated with respiratory and allergic problems, but symptoms alone cannot tell you whether mould is responsible, or whether mycotoxins are involved.1

In our guide, registered nutritionist Tracey explains what to look out for, which mould exposure symptoms deserve attention, and which household products we personally use and recommend that can help without promising more than they can deliver.

Affiliate disclosure: This article contains paid product links. We earn a commission if you buy through them, at no extra cost to you.

What are mycotoxins, and how are they different from mould?

Mould is a type of fungus. Mycotoxins are toxic substances produced by certain moulds; they are not the mould itself, and finding mould does not establish which toxins, if any, are present.2

It helps to separate two issues:

• Mould in your home: Damp indoor environments are the most common source of mould exposure and are linked with cough, wheeze, asthma and allergic symptoms; those associations do not establish that mycotoxins are the cause.1
• Mycotoxins in food: Certain toxins can contaminate crops before harvest or during storage, with health effects depending on the toxin and exposure.2

You cannot accurately judge a mould’s health risk from its colour. “Black mould” is a description, not a diagnosis: the priority is to address damp and mould regardless of its appearance.3

How to identify mould in your home

Look beyond the obvious patch on the wall.

Visible mould is an important warning sign of possible mould exposure, but growth can also be hidden behind wallpaper, beneath carpets or within water-damaged materials.4 Start with a careful visual check rather than pulling up flooring or opening walls yourself.

Look for these clues:

• A persistent musty smell: Particularly when concentrated in one room or around previously water-damaged materials.4
• Recurring condensation: Moisture collecting on windows, walls, or pipes signals a moisture problem that needs attention, an issue often found in autumn months.4
• Damp or damaged finishes: Water stains, cracking wallpaper and visible growth warrant investigation.4
• A history of leaks or flooding: A fresh coat of paint does not mean the underlying materials have dried or the cause has been repaired.4

Best practice is to check accessible areas around windows, bathrooms, sinks, and previously affected rooms. Photograph what you find and note when condensation or odours return, so you have a useful record for a landlord or building professional. This gives them a timeline and information, e.g., whether the problem occurs after heavy rain, when the heating turns off, etc. This can help identify a ventilation problem or even a leak coming from the property. It also saves time and money when investigating, especially for building professionals who may not be there when the problem is at its worst.

Keeping a record is extremely important because, under New UK Legislation known as Awaab’s Law, it sets strict legal deadlines for social housing to investigate and fix dangerous damp and mould hazards. Keeping that record not only provides a timeline but also allows assessors to fix the issue quickly.14

Does feeling better away from home mean mould is the cause?

If symptoms repeatedly improve away from a particular building or room, this may point to mould exposure, so note the pattern and discuss it with your practitioner. Treat it as a clue to investigate but not a home diagnostic test.3

Keep a diary and record symptoms, where you spent time and any visible damp. Avoid deliberately re-exposing yourself to see whether you react.

Mould exposure symptoms: what might you notice?

The strongest evidence on mould exposure concerns respiratory and allergic health. A review of epidemiological research found consistent associations between indoor dampness or mould and cough, wheeze, breathlessness, asthma, allergic rhinitis and eczema.1

Possible symptoms include:

• Nose and eyes: Sneezing, a runny nose, stuffy nose and irritated or itchy eyes.5
• Chest and breathing: Coughing, wheezing, breathlessness or worsening asthma.1
• Skin: Irritation, reddened skin or worsening eczema and psoriasis in some people.1

Children, older adults, people with respiratory conditions and those with weakened immune systems can be particularly vulnerable to mould exposure.5 Do not wait for symptoms before reporting or dealing with visible growth.

Are fatigue, headaches and brain fog a sign of mould and mycotoxins?

These symptoms deserve attention and are often overlooked, though they are not specific to mould. Though evidence is insufficient to establish that inhaled mycotoxins explain the broad collection of nonspecific symptoms often described online as “toxic mould syndrome”.3 Many online communities discuss developing serious fungal infections, ongoing fatigue, brain fog and trouble concentrating. Further reported symptoms range from unexplained muscle and joint pain to digestive problems such as stomach pain and nausea. 

That does not mean your symptoms are unimportant. It means a practitioner should assess you to consider other possible causes rather than assuming mould is the issue.

When to get medical help

Speak to your GP about persistent symptoms, recurrent wheezing or concerns that mould exposure is affecting an existing condition.5 Take your symptom diary and photographs as they can be helpful when making an assessment. 

Call 999 for severe difficulty breathing, such as gasping or being unable to get words out, or if someone develops blue or grey lips or sudden confusion.6 Contact NHS 111 for difficulty breathing or being more short of breath than usual; do not wait to establish whether mould is involved.6

How to identify mould and mycotoxins in food

Visible mould is a warning, not a toxin measurement.

Unexpected fuzzy growth, mouldy patches or obvious spoilage are reasons to reject food. Mycotoxins themselves are invisible and can penetrate beyond the visible patch, so removing what you can see does not guarantee that the rest is safe.7

The safest general household approach is to discard unexpectedly mouldy food rather than try to rescue it.7 Do not taste suspicious food to decide whether to keep it, and definitely do not rely on the smell test!

Which foods can contain mycotoxins?

Food groups monitored for contamination include cereals, nuts, spices, dried fruit, apples and coffee beans.2 These are potential sources, not a list of foods that everyone needs to stop eating.

Examples include:

• Aflatoxins: Can occur in crops including maize, peanuts, tree nuts and spices.2
• Ochratoxin A: Can occur in cereals, coffee beans, dried vine fruits and other foods.2
• Patulin: Associated particularly with rotting apples and products made from affected fruit.2

A recent PubMed review describes mycotoxin contamination across several food categories and the use of dietary exposure assessment and biomonitoring in research.8 That does not mean an individual food is contaminated or that a consumer test can diagnose illness. Still, it shows that certain food groups can contribute to mycotoxin exposure.

What symptoms can food-based mycotoxins cause?

The effects all depend on the mould and mycotoxin and the amount we are exposed to. The World Health Organisation reports nausea, vomiting and gastrointestinal disturbances with excessive patulin exposure, while some other mycotoxins can cause diarrhoea or, at sufficiently high exposures, serious organ damage.2

The issue is, no single “mycotoxin symptoms” checklist identifies the cause of an upset stomach. That is why it is important to see a practitioner and determine whether this is the root cause of your symptoms.

Can cooking destroy mycotoxins?

Do not rely on cooking to make mouldy food safe. Most mycotoxins are chemically stable and can survive food processing, so reheating, toasting or baking is not a dependable rescue method.2

Deliberately mould-ripened foods, such as blue cheese, are different from food that has unexpectedly become mouldy.7 

Follow the product’s storage instructions and any dietary advice specific to your circumstances.

How to get rid of mould and reduce ongoing mould exposure

Fix the moisture source first.

Cleaning alone is unlikely to solve a mould problem if the leak, condensation or other moisture source remains.4 Repair is the priority, rather than repeatedly buying products to cover the smell or stain.

Practical measures include:

• Repair leaks: Address plumbing, roof or drainage problems and dry affected materials promptly; the Environmental Agency advises drying wet materials within 24–48 hours where possible.4
• Use ventilation: Run extraction when cooking or showering, and open windows when practical and appropriate.4
• Monitor humidity: The Environmental Agency recommends keeping indoor relative humidity below 60%, ideally 30–50%; if needed, especially in locations where humidity and rain are high, consider purchasing a hygrometer to help you track it.4 It’s important that if your hygrometer shows high humidity, then ventilating, using a humidifier or even running your air conditioner can help reduce and pull the moisture out. This will also help with record-keeping.
• Report rental-property problems: Tell your landlord or managing agent promptly; UK Awaab’s 14 emphasises investigating underlying causes. And not to immediately blame residents’ everyday activities, as outlined in Awaab’s Law.5, 14

A normal room-humidity reading does not prove that a wall or hidden material is dry. Suspected hidden growth still warrants professional investigation.4

Steps to help clean and remove mould and mycotoxins and reduce exposure

2 Cleaning tips for mould and mycotoxins

1. For small areas on suitable hard surfaces, use detergent such as fungicidal solutions or natural solutions such as white vinegar, then dry the area thoroughly.4 It’s important to avoid dry brushing, sanding or opening up suspect materials yourself.
2. Wear suitable gloves, eye protection and a properly fitting particulate respirator to limit mould exposure while cleaning, following professional or official guidance.4 Protective equipment does not make every job suitable for DIY. If possible, use protective clothing you can dispose of rather than clean. Although a 60°C (140°F) wash may kill some mould spores on clothes and fabrics, it may not entirely break them down. However, if this is your only option, use oxygen bleach, chlorine bleach, or a white vinegar soak to denature and remove mycotoxin residue safely. (Never mix bleach and vinegar).

We recommend seeking professional advice for extensive, recurring, or hidden mould, especially because disturbing hidden growth can increase mould exposure and may require specialist equipment and protective clothing to remove.4 Mouldy porous materials may need removal rather than surface treatment, and regardless of what the paint tin says, painting over mould is not a remedy!4

A Cochrane review examined repairing mould-damaged houses and offices. The review found that repairing mould-damaged houses and offices can reduce some respiratory symptoms in adults; but the results were not consistent across all settings or groups.9 Repairs matter, but no intervention can promise that every symptom will disappear, especially after long-term mould exposure.

Improve food storage rather than restricting your whole diet.

Keep dry foods dry, prevent insect damage and avoid storing foods for unnecessarily long periods; WHO also recommends a varied diet to help reduce exposure and support nutrition.2 Use clean, dry storage containers and keep enough packaging information to retain dates and product details.

Keep your fridge at 0–5°C and check it with a thermometer rather than assuming the control dial shows the actual temperature.10 Better storage helps inhibit spoilage; it does not remove toxins already present in food.2

Products that we recommend which may help with mould prevention

Paid product links: We may earn a commission from purchases made through the links in this section. These are tools for moisture monitoring, exposure reduction and food storage, not treatments for mycotoxin illness.

A digital hygrometer

A hygrometer measures room humidity and helps you see whether moisture-control measures are working.4 Look for an easy-to-read display and maximum/minimum readings; it is a monitoring tool, not a mould detector. Please note that monitoring humidity doesn’t mean mould is present, but it is a good way to prevent mould formation and reduce mycotoxin exposure.

We recommend: Digital hygrometer on Amazon UK.

A dehumidifier with a humidistat

A dehumidifier removes moisture from the air and can help where humidity is excessive.4. We recommend choosing a model suitable for the room and operating temperature, and remember that it does not repair a leak or remove existing growth.

We recommend: Humidistat-controlled dehumidifier on Amazon UK.

A room-sized HEPA air purifier

An appropriate air cleaner can reduce airborne mould spores and fragments, helping lower mould exposure indoors, but it cannot remove mould growing in building materials or solve the moisture problem.11 Treat it as an optional additional measure, not the main intervention.

Look for a stated clean air delivery rate, suitable room sizing, available replacement filters and tolerable noise at the speed you will actually use. Do not assume a filtration percentage means the same percentage reduction in exposure, symptoms or mycotoxins throughout your home.11

We recommend: Levoit HEPA air purifier for bedroom and home 187m³/h, 80m² on Amazon UK.

Dry-food containers

Dry storage helps prevent mould, especially for grains, pasta, legumes, lentils, dried fruit, nuts, seeds, herbs, and spices. We recommend containers you can clean and dry thoroughly, such as glass (see the link below). Don’t use them to store already mouldy food.

We recommend: Airtight Borosilicate Glass Meal Prep Containers on Amazon UK.

Your next step: investigate, repair and seek support

You do not need to do everything at once. Start with one useful action: document a damp patch, report a leak, check the humidity or review how you store food.

If you’ve come to this article because you purchased our Mould & Mycotoxins Health Pack. Then we recommend using it as a checklist. However, we recommend discussing your symptoms with your healthcare professional before starting any programme. Do not use a supplement programme to delay building repairs or medical assessment. 

Important note to our readers: This article provides general information only and does not constitute individual medical advice or a diagnosis. Please seek personalised guidance from a healthcare professional if you have symptoms, an existing medical condition, or questions about supplements. Household products and supplements should not replace proper treatment or professional investigation regarding damp and mould.

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Scientific References

1. 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;119(6):748-56. doi:10.1289/ehp.1002410.
2. World Health Organization. Mycotoxins [Internet]. Geneva: WHO; 2023 Oct 2 [cited 2026 Sep 16].
3. American Academy of Allergy, Asthma & Immunology. Toxic mold syndrome: separating fact from fiction [Internet]. [cited 2026 Sep 16].
4. United States Environmental Protection Agency. A brief guide to mold, moisture and your home [Internet]. [cited 2026 Sep 16].
5. UK Government. Understanding and addressing the health risks of damp and mould in the home [Internet]. [cited 2026 Sep 16].
6. NHS. Shortness of breath [Internet]. [cited 2026 Sep 16].
7. Food Standards Agency. Natural toxins factsheet [Internet]. [cited 2026 Sep 16].
8. Li K, Cai H, Luo B, Duan S, Yang J, Zhang N, et al. Recent progress of mycotoxin in various food products-human exposure and health risk assessment. Foods. 2025;14(5):865. doi:10.3390/foods14050865.
9. Sauni R, Verbeek JH, Uitti J, Jauhiainen M, Kreiss K, Sigsgaard T. Remediating buildings damaged by dampness and mould for preventing or reducing respiratory tract symptoms, infections and asthma. Cochrane Database Syst Rev. 2015;(2):CD007897. doi:10.1002/14651858.CD007897.pub3.
10. Food Standards Scotland. Chilling food [Internet]. [cited 2026 Sep 16].
11. United States Environmental Protection Agency. Residential air cleaners: a technical summary. 3rd ed. Washington (DC): EPA; 2018.
12. Kawamoto M, Page E. Notes from the field: use of unvalidated urine mycotoxin tests for the clinical diagnosis of illness: United States, 2014. MMWR Morb Mortal Wkly Rep. 2015;64(6):157-8.
13. United States Environmental Protection Agency. Should I test or sample for mold in my home using the Environmental Relative Moldiness Index, or ERMI? [Internet]. [cited 2026 Sep 16].
14. Awaab’s law from the UK Government comes into effect [Internet]https://www.gov.uk/government/news/millions-of-tenants-safe-from-black-mould-through-awaabs-law

Medical and affiliate disclaimer

This article provides general information and is not a diagnosis or a substitute for individual medical advice. If you have symptoms, an existing medical condition or questions regarding supplements, speak to a qualified healthcare professional. Household products and supplements should not replace appropriate treatment or professional investigation relating to damp and mould.

We earn a commission when you purchase through affiliate links in this article, at no extra cost to you. As an Amazon Associate, we earn from qualifying purchases.