Mold allergy is caused by mold spores, which are microscopic fungi that are present everywhere in the air. In a few cases, indoor mold allergy can get more serious leading to breathing-related problems like bronchitis and asthma. Before anything else, the only way to treat an allergy to mold is by taking preventive measures to avoid exposure to triggers of mold allergy. Whenever you suspect mold allergy symptoms, do consult your doctor or a leading allergist for your condition.