Sinus problems are best thought of as an anatomical problem that interferes with circulation of naturally produced mucus. Usually, the anatomical problem is that the openings of the sinuses themselves are too small for adequate clearance of mucus and other debris. The backed up mucus and debris along with pressure differences from the inside of the sinuses and the outside world result in a variety of symptoms including facial pain and pressure, nasal congestion, and postnasal drip. In addition, patients with chronic sinus problems often complains of ongoing fatigue. Small sinus openings can also result in frequent episodes of acute sinusitis (a sinus infection).