Mold can affect people in several different ways, depending on: the type of mold, how much exposure there is, how long the exposure lasts,and a person’s health (especially asthma, allergies, or weakened immunity). Common effects of mold exposure Allergy-like symptoms This is the most common reaction. People may develop:sneezing runny or blocked nose itchy eyes coughing sore throat skin irritation or rashes headaches These symptoms often get worse indoors and improve after leaving the building. B