The typical reaction to elevated levels of mold spores is an allergic reaction. This is similar to the seasonal allergies many people develop in the fall when outdoor mold levels are often high. The typical symptoms are sneezing, nasal and sinus congestion, irritation in the eyes, nose, and throat, and coughing. In sensitive individuals, more serious problems may develop such as: shortness of breath frequent headaches trouble concentrating mood changes nausea and dizziness stress fatigue asthma skin irritation