Rhinitis is a medical condition that refers to inflammation or irritation of the nasal tissues. It can be caused by various factors such as allergies, infections, exposure to cold air, chemicals, and other environmental triggers. Symptoms may include sneezing, runny nose, congestion, itchiness, and postnasal drip. Treatment for rhinitis depends on the underlying cause but can include medications such as antihistamines or decongestants, nasal corticosteroids, and in some cases, allergy shots.