Mould and Moisture

Residential Services

Possible Health Effects of Indoor Mould

Here is a list of symptoms that may be the result of Mould :

  • Irritation, burning sensation, redness, itchy eyes

  • Irritation, burning sensation, throat secretion

  • Irritation, burning sensation, nasal congestion

  • Bleeding or runny nose

  • Sneezing, coughing

  • Shortness of breath

  • Heavy breathing after a cold

  • Feeling feverish

  • Rash(redness, pimples, spots), skin irritation

  • Unusual headaches

  • Nervousness, irritability without reason

  • Significant and frequent loss of memory

  • Trouble concentrating

  • Dizziness, fatigue

  • Insomnia, somnolence

  • Muscle pain, decrease in physical abilities

Symptoms may decrease significantly, or disappear all together once you leave the contaminated area.

Ask yourself the following questions:


  • Did symptoms appear when I moved in?

  • When I am away a few days, do I feel better?

  • Once I am back, do symptoms reappear?

Should you answer affirmatively to one of the questions, it is likely that your symptoms are the effects of poor indoor air quality.

Note that children and the elderly are generally most at risk. Pregnant women and sick people must also be cautious regarding significant presence of indoor Mould.

According to Health Canada, various health issues associated to Mould presence are caused by its different parts3.

Source Characteristics
Mould cell walls Causes inflammation
Spores and mycelia Causes allergies
Mycotoxin: Toxins produced by Mould and mushrooms May be toxic and cause infectious diseases in
humans Ex: Aspergillus fumigatus mycotoxins may
cause Aspergillosis – bronchitis and lung disease

Several things can sound the alarm for potential of water leakage or excessive dampness leading to fungal contamination (Mould).


3Gazette du Canada, vol 141, no 13, 2007, p 710-713.