A runny nose or excessive nasal discharge can be caused by anything that irritates or inflames the nasal tissues, allergy, cold or flu.
An otolaryngologist is a doctor who specializes in the management and treatment of diseases of the ear, nose, throat, and related structures of the head and neck. This professional is responsible for diagnosing and treating a wide range of conditions, including ear infections, sinusitis, tonsillitis, hearing loss, balance disorders, snoring, sleep apnea, and head and neck cancers. Otolaryngologists use a variety of tools and procedures, such as endoscopies, audiometry, and surgery, to diagnose and treat these diseases. It is advisable to see an otolaryngologist if persistent symptoms occur in the ear, nose, throat or neck.
Remember that for the proper selection of health professional that treats runny nose you must consider the nature, severity and symptoms you are presenting.