Infections, anatomical factors, and metamorphic reactions can lead to sinusitis, where the glands increase their secretion and stay in the nasal cavity for a longer period of time, which can result in thick nasal discharge. There are many triggers for sinusitis, such as viral infections including rhinovirus, influenza virus and parainfluenza virus. In addition, bacterial infections, allergic reactions, and anatomical abnormalities can cause sinusitis attacks. Generally, bacterial infection or secondary bacterial infection causes suppurative inflammation of the sinus mucosa, and the release of inflammatory factors will lead to increased permeability of the sinus mucosal blood vessels, increased secretion of the glands, and purulent secretions will flow through the sinus orifices through the nasal cavity, resulting in the formation of more thick nasal mucus. It is recommended that patients seek timely medical consultation and active treatment under the guidance of the doctor to avoid aggravation of the condition.