What Are the Causes of Sinus Irritation & Drainage?

Sinus irritation and and the drainage that often accompanies it are nuisances and, if not taken care of in a timely manner, can become acute or chronic problems. Called sinusitis, sinus irritation that has led to inflammation and swelling of the nasal cavities inhibits normal mucus flow. According to the Mayo Clinic, this buildup of excess mucus is a feeding frenzy for bacteria in the sinuses; an infection can easily take hold and cause discomfort for the sufferer. Preventative measures can be taken if the causes of sinus irritation and drainage are understood.

Infection

• The majority of sinus irritation and drainage issues stem from a common cold or upper respiratory tract infection.

Allergies

• Common allergies, such as ragweed, pet dander, mold or cigarette smoke, restrict nasal passageways and thus inhibit normal mucus flow.

Preexisting Medical Conditions

• Certain conditions, such as cystic fibrosis, HIV and various immunity-weakening diseases can cause the sinus cavities to swell, encouraging the growth of harmful bacteria.

Structural Issues

• A deviated nasal septum (i.e., crooked nasal wall) can obstruct the natural flow of mucus, as can tumors or polyps within the nose.

Nasal Disfigurement

• If the nose has been altered, perhaps by being hit or broken, the nasal cavities may be narrowed or blocked enough to inhibit mucus flow.