Sneezing may be caused by foreign body stimulation, and can also be the manifestation of allergic rhinitis, acute rhinitis, vasomotor rhinitis and other diseases. 1. Foreign body stimulation: when the nasal mucosa is stimulated by external foreign body stimulation, such as cotton swabs, paper balls, and pungent odor, dust particles, flying insects and other foreign body stimulation, sneezing can discharge the foreign body in the nasal cavity through sneezing, which is a kind of self-protection reaction of the human body. 2. Allergic rhinitis: this is often associated with contact with allergens, such as artemisia, pollen, dust mites, etc., will not stop sneezing, accompanied by nasal itching, runny nose, tears and so on. 3. Acute rhinitis: colds in the nose is acute rhinitis, which will lead to increased sensitivity of the nasal mucosa, increased secretion, sneezing, runny nose at the beginning, and then will gradually appear sore throat, headache, nasal congestion, cough and other symptoms. 4. Vasomotor rhinitis: mostly seen in the case of exercise, diet and alternation of heat and cold, the nasal mucosa has a foreign body sensation, at this time will also sneeze. Nasal mucous membrane gland secretion increases in the case, but also nasal congestion, runny nose and so on. If you find this symptom, you can actively consult a doctor and follow the doctor’s instructions for systematic examination and standardized treatment, so as to avoid letting it go and making a mistake.