Allergic rhinitis (also known as allergic rhinitis): The main symptoms are nasal congestion, nasal itching, sneezing and clear runny nose. The symptoms are similar to a cold, and many patients mistake it for a cold and take anti-cold medication on their own, resulting in a delay in proper diagnosis and treatment. The disease is characterized by recurrent nasal itching, followed by uncontrollable sneezing, ranging from several to dozens of sneezes at a time, followed by a long flow of clear watery nasal mucus. The nasal congestion is unilateral or bilateral and is accompanied by hyposmia or loss of smell, but without fever or sore throat. Patients often have red and painful nasal vestibular skin due to constant wiping. Nasal mucosal edema can cause nasal congestion, and patients with severe nasal congestion can only open their mouths to breathe, which then triggers symptoms such as dry throat and hoarseness, which can last for hours, days or even weeks. Some patients are accompanied by asthma and a series of manifestations such as itchy eyes, red eyes, tearing, tinnitus, dizziness, headache and insomnia. It affects patients’ work, study, sleep and recreation, resulting in lower work efficiency and lower quality of life. If treatment is delayed or improperly treated, a number of comorbidities can occur, the most common and important being bronchial asthma, and in some cases, complications such as pharyngitis, laryngitis, sinusitis, nasal polyps, olfactory disturbances, otitis media, and hearing impairment.