Mold allergy causes the same signs and symptoms that occur in other types of upper respiratory allergies. Mold allergy symptoms can include: --Sneezing--Runny or stuffy nose--Cough and postnatal drip--Itchy eyes, nose and throat. Mold allergy symptoms vary from person to person and range from mild to severe. You may have year-round symptoms or symptoms that flare up only during certain times of the year. You may notice symptoms when the cold weather is damp, or when you're in indoor or outdoor spaces that have high concentrations of mold.