What causes a stuffy nose? Generally speaking, a stuffy nose is caused by rhinitis, or inflammation of the mucus membranes that line the nose. Rhinitis can be caused by allergic or non-allergic ...

When the virus gets into your body, it comes into contact with the mucous membranes that line your nose, mouth, and eyes. The virus enters a healthy cell and uses the cell to make new virus parts.

Mucus comes from the mucous membranes, such as those lining the nose, throat, and lungs. Although people may find it unpleasant, mucus has several important roles. It moisturizes structures of the ...