Rhinitis is an inflammation of the nasal lining, often resulting in symptoms like a runny or stuffy nose, sneezing, and itching. It can be triggered by various factors, including allergens such as pollen, dust mites, or pet dander, as well as irritants like smoke or strong odors. There are two main types of rhinitis: allergic rhinitis, which is caused by allergens, and non-allergic rhinitis, which can be due to infections or environmental factors. Treatment options may include antihistamines, nasal sprays, and avoiding known triggers to help manage symptoms effectively.