Sinus problems are common. They can present as acute sporadic, acute recurrent, or chronic sinusitis. Symptoms may include nasal congestion, post-nasal drip, discolored nasal discharge, sinus pressure or headaches, and even toothaches. Allergy plays an important role in causing a predisposition to sinus problems by causing inflammation with swelling in the nasal passages, obstruction of sinus ostia and production of excess mucus. Other risk factors are viral upper respiratory infection, smoking, and immunodeficiency. Nasal polyps may develop, and they can impair sense of taste and smell and often contribute to chronic sinus condition. Continuous nasal congestion may affect the Eustachian tubes, which are essential to drainage of the middle ears, leading to fluid accumulation, ear infections and hearing problems. An Allergist-immunologist is also specialized in the management of sinus and ear problems.