List of diseases that include nasal congestion as a symptom. Any major, well-known medical conditions associated with nasal congestion are included below, listed alphabetically with photos when available. Any maladies, sicknesses or illnesses with nasal congestion as a symptom can be seen below. For any real, further diagnosis of something you feel you might have, please consult a doctor. This list includes information about each disease, such as what risks are associated with it. Examples of illnesses on this list include Sinusitis and Leprosy.This list answers the questions, "What risks are associated with nasal congestion?" and "What disease can I have if I have nasal congestion?"