Mould (or mold, depending on where you're from) is a common issue in many homes and workplaces, but its impact on health is often underestimated. Mould exposure can lead to a range of health problems, from mild allergic reactions to more severe respiratory issues. Understanding these risks is worthwhile for anyone maintaining a home in a humid climate.
In Singapore, where average humidity sits at 84% year-round and rarely drops below the 60% threshold at which mould begins to grow, this is not a seasonal concern. It's a constant one.
The Health Effects of Mould Exposure
1. Respiratory Issues
Mould spores can trigger allergic reactions in some individuals, causing symptoms such as coughing, wheezing, nasal congestion and throat irritation. For those with asthma or other respiratory conditions, mould exposure can worsen symptoms and lead to breathing difficulties.
Respiratory effects are the best-evidenced of all mould-related health outcomes. The World Health Organization's guidance on indoor air quality links damp and mouldy indoor environments to upper respiratory tract symptoms, cough and wheeze in otherwise healthy people, and to worsened symptoms in people who already have asthma.
2. Allergic Reactions
Exposure to mould can produce reactions similar to hay fever, including sneezing, a runny or blocked nose, itchy eyes and skin rash. People with existing allergies or weakened immune systems tend to be more susceptible.
3. Skin Irritation
Direct contact with mould or mould-affected materials can irritate skin, causing redness and itching, and in some cases infection. Anyone with sensitive skin or a pre-existing skin condition may react more strongly. This is worth bearing in mind when handling a mouldy bag or pair of shoes, which is why gloves are sensible.
4. Neurological Symptoms
Certain mould toxins, known as mycotoxins, have been associated with symptoms including headaches, dizziness, difficulty concentrating and changes in mood.
It's worth being straightforward here: this area is genuinely contested. Some clinicians and researchers report clear neurological effects from prolonged mould exposure, while several major health bodies note that the evidence linking indoor mycotoxin exposure to these specific outcomes remains inconclusive. If you're experiencing symptoms you think may be mould-related, that's a conversation for a doctor rather than a blog post.
5. Respiratory Infections
Prolonged exposure to mould can increase the risk of respiratory infections, including fungal infections in the lungs. People who are immunocompromised or have chronic lung disease are at meaningfully higher risk here than the general population.
Reducing Your Risk
Addressing moisture is the single most effective step. Keep indoor humidity as low as practical, ensure bathrooms and kitchens are properly ventilated, and repair leaks and water damage promptly rather than living with them.
Regular inspection of the places mould likes matters too: behind and beneath furniture, inside wardrobes, in shoe cabinets, and anywhere against an exterior wall. Mould is almost always easier to deal with in week two than in month three.
In Singapore specifically, enclosed storage is the recurring problem. A wardrobe or shoe cabinet is warm, still, dark and humid, which is close to ideal conditions. Leather goods stored in those spaces are both a target for mould and, once affected, a source of spores that circulates every time you open the door.
If you suspect significant mould growth in your home, or you're experiencing unexplained symptoms you think may be related, seek professional help. A qualified mould remediation specialist can assess the situation and recommend appropriate steps, and a doctor can advise on the health side. Neither question is well answered by guesswork.
Mould on Leather Specifically
Leather is organic and porous, which makes it one of the materials mould colonises most readily in a tropical climate. Beyond the damage to the item itself, a mouldy bag in an enclosed wardrobe is a small ongoing source of spores in your home.
If you've found mould on leather goods, our step-by-step guide to cleaning mouldy leather covers safe removal, including the protective measures worth taking. If you're not certain what you're looking at, the white spots identification guide explains how to tell mould from salt stains and finish deterioration.
For prevention, the storage guide sets out the approach that actually works in Singapore's humidity.
In Short
Mould exposure affects people differently, and most people living with small amounts of household mould experience no obvious ill effects. But the respiratory and allergic effects are well established, the risk is higher for children, older people, and anyone immunocompromised or asthmatic, and in a climate like Singapore's the problem compounds quietly if left alone.
Controlling moisture and catching growth early is most of the answer.
This article is general information, not medical advice. If you have health concerns you believe may relate to mould exposure, please speak to a doctor.
See our Anti-Mould Leather Care range for protecting leather goods in humid conditions.