Common Cold

• The common cold is a viral infection affecting the upper respiratory track. It causes a stuffy nose and sneezing. While unpleasant, it is usually harmless.
  
  

Allergies

• Allergies are a common cause of a stuffed nose. Allergies result when the immune system reacts to outside substances, such as pollen or pet dander.
  
  

Asthma

• Asthma is a chronic disease that causes the airways to become swollen and inflamed. It is a little known fact that one symptom of the disease is a stuffed nose.
  
  

COPD

• Chronic Obstructive Pulmonary Disease is a chronic disease that affects the lower respiratory tract of the lungs. It is commonly caused by smoking. The disease causes difficulty breathing and can be accompanied by a stuffed nose.
  
  

Emphysema

• Emphysema decreases the lungs' ability to expel air. It causes wheezing and shortness of breath. The disease also causes a large amount of mucus to be produced, resulting in a stuffy nose.