Sinus - Health issues involved with Travel.
"Reduce air travel - Air travel may cause a problem for an individual suffering from acute or chronic sinusitis. A bubble of air trapped within the body expands as the air pressure in a plane reduces. This expansion causes pressure on the surrounding tissues and can result in the blockage of the Eustachian tubes (tube connecting ear to pharynx). The result may lead to a discomfort in the sinuses or in the middle ear during the plane's ascent or descent. Doctors recommend using decongestant nose drops or inhalers before the flight to avoid this discomfort."