Humidity in the house becomes harmful to health when its rate is higher than 50%. The resulting proliferation of mold and dust mites causes a series of physical symptoms.
If you experience respiratory symptoms or allergies (coughing, chest pain, runny nose, sneezing, bronchitis, pneumonia, etc.), skin or eye irritation, or general effects such as headaches, chronic fatigue, or a drop in the immune system, too much humidity may be the cause. Especially if no other factors seem to explain the symptom. In this case, call a professional as soon as possible to treat the cause of the humidity.