Sinusitis is an inflammation of the sinus cavities. Allergic reactions, accompanied by the formation of polyps, frequently contribute to the development of sinusitis. A humid, damp and cold climate, large temperature fluctuations, and heavy air pollution can contribute to the development of sinus infections. A. Vogel Sinus Relief acts on symptoms of nasal congestion and pressure, sinus congestion, inflamed sinuses, sinus headaches. 33920SKU 364031105555