If you've been living with allergies, you probably know the obvious stuff by now -- don't take in stray cats, don't hang around in dusty attics, don't inhale deeply in smoking lounges. But that might not be enough. There could be hidden allergy triggers and irritants all around you that you don't know about. "Hidden allergens and irritants are a huge problem for people with allergies," says Hugh H. Windom, MD, an associate clinical professor of immunology at the University of South Florida. "The...
Illegal drugs. Cocaine and other snorted street drugs often cause chronic nonallergic rhinitis.
Weather changes. Sudden changes in weather or temperature can trigger nonallergic rhinitis. Skiers, for instance, often develop a runny nose. And some people are affected by any cold exposure. In some cases, people even start sneezing after leaving a cold, air-conditioned room.
Hormone changes. Nonallergic rhinitis often occurs during periods of hormonal imbalance. For instance, it may occur during puberty, menstruation, or pregnancy. It usually starts during the second month of pregnancy and lasts until childbirth. Hormonal conditions such as hypothyroidism can also trigger symptoms.