Mold Allergy can cause a variety of allergy symptoms, such as nasal congestion, runny nose, post nasal drip, wheezing, coughing and shortness of breath. Mold, including black mold and other types of mold can be found indoors and outdoors. If you are having allergy symptoms, you should see an allergist, who may recommend allergy testing. If mold allergy is found, the source of mold will need to be found with mold testing.