Small children sneeze frequently for a long time, it has been a long time, may be due to light sneeze reflex, allergic rhinitis, environmental factors and other reasons. 1. Light sneezing reflex: a small portion of the population may appear this situation, due to the perception of the eyes and nose by the same trigeminal nerve innervation, when the eyes come into contact with bright light, the visual nerve and the olfactory nerve will occur “loop crossings”, which can appear in small children often sneezing for a long period of time phenomenon. 2. Allergic rhinitis: it may be caused by children’s contact with pollen, dust mites and other allergens, due to the body will release a variety of inflammatory mediators, the patient’s sensory nerve sensitivity of the nasal mucosa increased, which can appear often sneezing for a long time. 3. Environmental factors: When there are irritating gases, dusts, pollens, fumes, animal dander or feathers in the house for a long time, the human body can sneeze the irritants or foreign materials out of the body, which is a kind of self-protection way after inhalation. Children often sneeze for a long time, it has been a long time, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.