structural:expansion
Respiratory disorders

Abnormal breathing patterns include Kussmaul breathing, Biot's respiration and Cheyne–Stokes respiration.

Other breathing disorders include shortness of breath (dyspnea), stridor, apnea, sleep apnea (most commonly obstructive sleep apnea), mouth breathing, and snoring. Many conditions are associated with obstructed airways. Chronic mouth breathing may be associated with illness. Hypopnea refers to overly shallow breathing; hyperpnea refers to fast and deep breathing brought on by a demand for more oxygen, as for example by exercise. The terms hypoventilation and hyperventilation also refer to shallow breathing and fast and deep breathing respectively, but under inappropriate circumstances or disease. However, this distinction (between, for instance, hyperpnea and hyperventilation) is not always adhered to, so that these terms are frequently used interchangeably.

A range of breath tests can be used to diagnose diseases such as dietary intolerances.A rhinomanometer uses acoustic technology to examine the air flow through the nasal passages.