Yellow sticky nasal mucus may be caused by upper respiratory tract infection, atrophic rhinitis, sinusitis and other causes. 1. Upper respiratory tract infection: the human body in the cold, low immune function, by pathogens invasion, may make the upper respiratory tract infection, inflammatory reaction, bacterial infection may appear in the nasal cavity with yellow mucous nasal symptoms. 2. Atrophic rhinitis: this disease is a kind of inflammatory disease of nasal mucosa and gland atrophy, patients suffering from rhinitis, will be infected because of stinky nose bacillus leading to yellow sticky nasal mucus and crusts in the nasal cavity. 3. Sinusitis: Sinusitis is generally secondary to upper respiratory tract infections and is a non-specific inflammation of the sinus mucosa. Under the stimulation of inflammation, patients with sinusitis may have yellow sticky nasal mucus, nasal congestion, headache and other symptoms. The appearance of yellow sticky nasal mucus, there may also be a foreign body in the nasal cavity secondary bacterial infection, nasal tumors and other causes, it is recommended to go to the hospital to determine the cause of the disease, under the guidance of the doctor for treatment.