Rhinitis is a medical term used to describe inflammation of the mucous membrane lining the nose. It can be caused by various factors such as allergies, infections, irritants, or structural issues. Symptoms of rhinitis include a runny or stuffy nose, sneezing, itching, and congestion. Researchers in the field of rhinitis study the causes, risk factors, prevention, and treatment options for this common condition. They may also investigate the link between rhinitis and other health conditions, such as asthma or sinusitis.