Mucus buildup
Runny nose
Stuffy nose
Swollen nasal tissue
Chemical exposures
Decongestant nasal spray overuse
Drug addiction
Dry air
Enlarged adenoids
Environmental irritants
Foreign body in the nose
Hormonal changes
Medications, such as high blood pressure drugs
Pregnancy
Respiratory syncytial virus (RSV)
Stress
General Physician
Otorhinolaryngologist