Sneezing and runny nose in summer are generally considered to be symptoms due to respiratory disorders. On the one hand, consider that the symptoms may be caused by an upper respiratory tract infection, that is, a cold. On the other hand, consider that it is caused by nasal inflammation, most commonly sneezing and clear water nasal discharge due to allergic rhinitis attacks.1. Upper respiratory tract infection: It mainly manifests as symptoms of the nose, such as sneezing, clear water nasal discharge and nasal congestion. It may also be accompanied by headache, sore throat, hoarseness, muscle aches, etc. Fever may also appear, which may be low in milder cases and high in more severe cases. Upper respiratory tract infections are self-healing and usually heal in 5-7 days. Treatment is mainly symptomatic, and antipyretic and analgesic drugs, such as acetaminophen and ibuprofen, can be used if necessary. At the same time, patients need to pay attention to rest, drink more water, keep indoor air circulation to avoid secondary bacterial infection; 2, allergic rhinitis: non-infectious disease, patients will appear paroxysmal sneezing, runny nose, nasal itching, nasal congestion and other symptoms, mainly due to contact with allergens, mostly seasonal allergies, outdoor pollen in summer may cause, generally last for several weeks, the symptoms can be self-relieved. Patients can clarify the allergen through allergen testing and avoid contact with allergens in the future. In such cases, cetirizine, loratadine and nasal glucocorticoids, such as budesonide nasal spray and mometasone furoate nasal spray, are often used clinically to relieve sneezing and clear nasal discharge. In addition to symptomatic treatment according to different symptoms, in order to avoid sneezing and clear nasal discharge in summer, we should pay attention to avoid suddenly entering and leaving the air-conditioned room in hot weather, and not to blow the air-conditioner directly after sweating, so as not to trigger a cold; flowers and plants are abundant in summer, so if you are allergic, it is recommended not to go to parks and woods to avoid triggering allergic rhinitis.