Rhinitis, also known as coryza, is irritation and tenderness of the mucous membrane inside the nose. Common indications are a stuffy nose, runny nose, sneezing, and post-nasal drip. The most common kind of rhinitis is allergic rhinitis, which is regularly triggered by airborne allergens such as pollen and dander. Allergic rhinitis may cause other symptoms, such as sneezing and nasal itching, coughing, headache] fatigue, malaise, and perceptive impairment.The allergens may also affect the eyes, causing watery, reddened, or itchy eyes and puffiness nearby eyes. The inflammation results in the generation of large amounts of mucus, commonly making a runny nose, as well as a stuffy nose and post-nasal drip. In the case of allergic rhinitis, the inflammation is caused by the degranulation of post cells in the nose. When mast cells degranulate, they discharge histamine and other chemicals, starting an inflammatory process that can cause indications outside the nose, such as fatigue and malaise.