GENERAL SYMPTOMS OF RESPIRATORY DISEASE  Hypoxia : Decreased levels of oxygen in the tissues  Hypoxemia : Decreased levels of oxygen in arterial blood  Hypercapnia : Increased levels of CO 2 in the blood  Hypocapnia : Decreased levels of CO 2 in the blood  Dyspnea : Difficulty breathing  Tachypnea : Rapid rate of breathing  Cyanosis : Bluish discoloration of skin and mucous membranes due to poor oxygenation of the blood  Hemoptysis : Blood in the sputum
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