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A detailed look at the respiratory system and how it works.

Sleep apnea is a serious, potentially life-threatening condition. It is far more common than generally understood. Sleep apnea happens in all age groups and both genders.

Cystic fibrosis (CF) is an inherited life-threatening disease that affects many organs. People with CF have problems with the glands that make sweat and mucus.

Narcolepsy is a sleep disorder. If you have narcolepsy, you are likely to become drowsy or to fall asleep at inappropriate times and places.

Pharyngitis and tonsillitis are infections that cause inflammation. If the tonsils are mainly affected, it is called tonsillitis. If the throat is mainly affected, it is called pharyngitis. These infections are spread by close contact with others. Here's what you need to know.

Pneumonia is an infection of one or both of the lungs caused by bacteria, viruses, fungi, or chemical irritants. It is a serious infection or inflammation in which the air sacs fill with pus and other liquid.

Primary pulmonary hypertension (PPH) is high blood pressure in the lungs. It's a rare lung disorder in which the blood vessels in the lungs narrow and the pressure in the pulmonary artery rises far above normal levels.

Restless legs syndrome is a sleep disorder that causes creepy, crawly feelings in your legs. This often happens when you are trying to go to sleep or have been sitting for a long time.

Sarcoidosis is a rare disease caused by inflammation. Sarcoidosis in the lungs is called pulmonary sarcoidosis. It causes small lumps of inflammatory cells in the lungs. These lumps are called granulomas and can affect how the lungs work.