Ear Discomfort When Flying By Robert James It is quite widespread to respond passengers

complaints of ear discomfort when flying or right away after takeoff. Most complaints arise in the time of takeoff or landing. The air pressure inside the passenger cabin may cause your ears to pop. This could lead, at landing or takeoff, to temporary hearing loss or simply ear discomfort. These side effects usually last only while you are flying and, after a short time, should get back to what is normal for you. They result from a difference between air pressure in the part of your ear called the "middle ear" and the atmospheric pressure of the plane. You can do a number of things to reduce the effects of flying on hearing. Yawn, chew gum, or suck on a hard candy. Keep swallowing, using a glass of water or another drink, but not alcohol. Do this regularly, every 15 to 30 seconds as necessary. Some people have reported that earplugs also help but, so far, there has been no medical study to prove that earplugs really help. You are going to benefit from postponing your flight in the event you are suffering from either infected ears or sinuses, allergies or from the feeling of a stuffed up head. If you have to travel, ask your family doctor or local pharmacist for advice and about decongestants you can use. Many doctors recommend that you use a decongestant spray about 20 minutes before you fly. It is important not to use the spray for more than five days continuously.

What is the subject of the article？

A．The side effects of some medicines.

B．The causes of hearing loss.

C．The function of the ears.

D．The effects of flying on hearing.