Keeping a tidy home can be a task, but it becomes a feat if you have indoor allergies to common household "pests," such as dust, mold or pet dander. The most common indoor allergen is the nearly invisible DUST MITE, which feeds off dead skin cells. When dust mite residue is inhaled, the immune system may start a cascade of reactions that leads to the release of histamines. These histamines cause the eyes to itch, the nose to run and the airways to tighten, resulting in coughing and shortness of breath. MOLD, often found in the kitchen, bathroom and basement, can grow beneath wallpaper, in rugs and on the soil of houseplants. When mold spores are released into the air, we may inhale them, which can cause coughing, sneezing and itching eyes, as well as hives and scaly rashes in some people. Pet dander, and saliva and urine attached to pet hair or fur, are also common indoor allergens. About 6 percent of the population is allergic to cats, followed closely by dogs and then rodents like gerbils, ferrets and mice. And a surprising allergen? Cockroaches. Recent research suggests that cockroaches, specifically their digestive enzymes, saliva, and body parts, can be a major factor in both asthma and nasal allergies. If you think you have indoor allergies, talk with your doctor or an allergist about the best way to identify the cause of your symptoms and your treatment options.