First of all, colds are highly contagious, so most of them occur in groups, such as families, schools, work environments, etc.; allergic rhinitis is not contagious, but can be inherited, so if there are blood relatives with allergic diseases, including allergic rhinitis, asthma, skin allergies, drug allergies and other allergy history of the family, the possibility of attacks is greater. The nasal symptoms of cold such as sneezing, runny nose and nasal congestion are often persistent and will continue for several days, with the control of the cold, the symptoms gradually reduced and finally relieved; while allergic rhinitis attacks are paroxysmal and may occur only once or several times a day, more obvious in the early morning or after the stimulation of odor, etc., after the attack as normal; allergic rhinitis is usually not accompanied by fever, while the cold is usually accompanied by fever; Allergic rhinitis is characterized by frequent sneezing and clear watery nasal discharge, while cold is characterized by less sneezing, less nasal itching, pronounced and persistent nasal congestion, and nasal discharge may change from clear or mucous to purulent; cold is characterized by more severe systemic symptoms, such as chills, fever, weakness of limbs, myalgia, headache, sore throat, gastrointestinal discomfort, etc., while allergic rhinitis is characterized by nasal symptoms only or accompanied by asthma or skin allergy; the duration of cold is shorter, usually 1-2 weeks. The duration of colds is usually short, 1-2 weeks, while allergic rhinitis has a longer duration and recurrent attacks throughout the year. Allergic rhinitis is not contagious, but it can be inherited, so if there are blood relatives with allergic diseases, including allergic rhinitis, asthma, skin allergy, drug allergy and other allergic history of the family, the possibility of attacks is greater. The nasal symptoms of cold such as sneezing, runny nose and nasal congestion are often persistent and will continue for several days, with the control of the cold, the symptoms gradually reduce and finally relieve. Allergic rhinitis attacks are paroxysmal and may occur only once or several times a day, more pronounced in the early morning or after stimulation by odors, and after the attack, it is like a normal person; allergic rhinitis is usually not accompanied by fever, while colds are usually accompanied by fever; allergic rhinitis has frequent sneezing and clear watery nasal discharge, while colds have less sneezing, less pronounced nasal itching, pronounced nasal congestion and In allergic rhinitis, the sneezing is frequent and the nasal itch is not obvious, the nasal congestion is obvious and persistent, and the nasal discharge may change from clear or mucous to purulent; in cold, the systemic symptoms are more severe, such as chills, fever, weakness of limbs, myalgia, headache, sore throat, gastrointestinal discomfort, etc., while in allergic rhinitis, the symptoms are only nasal or accompanied by asthma or skin allergy; the duration of cold is shorter, usually 1-2 weeks, while in allergic rhinitis, the duration is longer and recurrent throughout the year.