The symptoms of cold, dizziness and nosebleeds are mainly common when the inflammatory reaction of the upper respiratory tract mucosa is more pronounced and the damage to the upper respiratory tract mucosa is more severe. As the patient’s immunity decreases, he or she will be infected by viruses, bacteria, mycoplasma and other pathogens, causing the mucous membrane of the upper respiratory tract, including the nasal cavity, mouth and throat, to break down and bleed due to the rupture of blood vessels, and the symptoms of nosebleeds will appear at this time. The inflammatory reaction will secrete a large amount of inflammatory secretions, which contain a large amount of inflammatory metabolites. This time will make the degree of edema in the airway more obvious, leading to different degrees of hypoxia, resulting in the appearance of dizziness symptoms.