Normally, mucus is clear. But during illness, it can acquire colour—yellow or green. Regardless of whether it is clear or ...

Mucus consists of water and long molecules called mucins that combine to form a clear gel. Bloody boogers can appear as red ...

Symptoms of rhinitis include: An excess of thick mucus can cause nasal congestion, but a stuffy nose usually results from the swelling of inflamed blood vessels in the tissues lining the nose. Some ...