The reasons for the symptoms of clear nasal mucus and yellow sputum include: respiratory tract infection, rhinitis and so on. 1. Respiratory tract infection: often caused by bacterial infection due to low immunity, resulting in inflammatory reactions such as congestion, edema and yellow purulent secretions oozing out of the mucosa of the respiratory tract. It can be manifested as watery nasal mucus and yellow sputum, accompanied by fever, cough, sore throat and other symptoms. 2. Rhinitis: For example, sinusitis, chronic rhinitis or allergic rhinitis may present with symptoms of clear nasal discharge and yellow sputum. Usually, sneezing can be accompanied by sneezing, for a large amount of clear nasal mucus, combined with lower respiratory tract infections often appear yellow sputum. In addition to this, there are also symptoms of reduced sense of smell, nasal congestion and itchy eyes. If you have a clear nose with yellow sputum, you need to go to the hospital in time to clarify the cause of the disease and follow the doctor’s instructions to treat the symptoms.