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.