<unk> , also known as coryza, is irritation and inflammation of the mucous membrane inside the nose. Common symptoms are a stuffy nose, runny nose, sneezing, and post-nasal drip. The inflammation is caused by viruses, bacteria, irritants or allergens. The most common kind of<unk>  is allergic<unk> , which is usually triggered by airborne allergens such as pollen and dander. Allergic<unk>  may cause additional symptoms, such as sneezing and nasal itching, coughing, headache, fatigue, malaise, and cognitive impairment. The allergens may also affect the eyes, causing watery, reddened, or itchy eyes and puffiness around the eyes. The inflammation results in the generation of large amounts of mucus, commonly producing a runny nose, as well as a stuffy nose and post-nasal drip. In the case of allergic<unk> , the inflammation is caused by the degranulation of mast cells in the nose. When mast cells degranulate, they release histamine and other chemicals, starting an inflammatory process that can cause symptoms outside the nose, such as fatigue and malaise. In the case of infectious<unk> , it may occasionally lead to pneumonia, either viral or bacterial. Sneezing also occurs in infectious<unk>  to expel bacteria and viruses from the respiratory tract.<unk>  is very common. Allergic<unk>  is more common in some countries than others; in the United States, about 10–30% of adults are affected annually. Mixed<unk>  (MR) refers to patients with nonallergic<unk>  and allergic<unk> . MR is a specific<unk>  subtype. It may represent between 50 and 70% of all AR patients. However, true prevalence of MR has not been confirmed yet.
Rhinitis
Airsacculitis
Posthitis
Laryngitis
Pharyngitis
Sinusitis
Rhinosinusitis
Chondritis