Allergic rhinitis has the typical 4 major symptoms, namely itchy nose, sneezing, runny nose and nasal congestion. Most patients have nasal itching, sometimes accompanied by itching of the soft palate, eyes and throat. If the itch is mild, there is a sensation of itching in the nose, but if it is severe, it is unbearable and the nose has to be rubbed from time to time. There are often several paroxysmal sneezing episodes every day, each time as few as 3 to 5, as many as a dozen, or even more. Watery nasal discharge, blowing the nose several times or more, often changing the handkerchief several times. The severity of nasal congestion varies. In seasonal allergic rhinitis, the above symptoms are more severe. During the period of pollen dispersal, the patient has a clear, self-flowing snot and red eyes every day. Due to the obvious edema of nasal mucosa, nasal congestion is usually heavy, coupled with more nasal secretions, serious cases can not sleep at night or occur obstructive sleep disordered breathing syndrome. Patients may have hyposmia, which is related to the extensive edema of nasal mucosa. Some patients have chest tightness, throat itching, cough, and asthma attacks. They last for several weeks, and once the season is over, the symptoms resolve without treatment, and then reoccur the following year with the same season. Perennial allergic rhinitis is relatively mild, with intermittent or persistent attacks. The timing of attacks is variable, but they often occur when cleaning a room, arranging bedding or clothing, smelling a musty odor, or coming into contact with pets.