12 Respiratory Conditions With Physical Signs Beyond Coughing

6. Sleep Apnea - The Nocturnal Respiratory Disruption

Obstructive sleep apnea creates a distinctive pattern of physical signs that reflect both the mechanical obstruction of upper airways during sleep and the systemic consequences of chronic intermittent hypoxemia, often presenting with manifestations that patients and healthcare providers may not immediately connect to respiratory pathology. The most obvious physical characteristic involves upper airway anatomy, with patients typically demonstrating a thick neck (circumference >17 inches in men, >16 inches in women), retrognathia or micrognathia, macroglossia, and enlarged tonsils or uvula that contribute to airway narrowing during sleep. Facial morphology often includes a high, arched palate and crowded oropharynx, while nasal examination may reveal septal deviation, turbinate hypertrophy, or chronic congestion that forces mouth breathing. The cardiovascular system bears significant impact from repeated episodes of hypoxemia and arousal, leading to systemic hypertension that may be refractory to standard antihypertensive therapy, particularly elevated morning blood pressure readings. Patients frequently exhibit signs of right heart strain, including peripheral edema, elevated jugular venous pressure, and hepatomegaly, reflecting the development of pulmonary hypertension from chronic hypoxemic episodes. Neurological manifestations include morning headaches, cognitive impairment, and excessive daytime sleepiness that may be observed during clinical encounters as frequent yawning, difficulty maintaining attention, or actually falling asleep during conversations. The skin may appear chronically fatigued with dark circles under the eyes, while patients often demonstrate irritability, mood changes, and decreased libido reflecting the systemic effects of sleep fragmentation. Gastroesophageal reflux symptoms frequently accompany sleep apnea due to the negative intrathoracic pressures generated during obstructive episodes, creating additional physical discomfort that compounds the overall clinical picture.