Disease process		Signs and symptoms
Reactive airway disease
	Asthma	Evidence of reversible airway obstruction even when not infected
	Allergic aspergillosis	Transient pulmonary infiltrates
		Eosinophilia in sputum and peripheral blood smear
	Occupational exposures	Symptoms worse during the work week but tend to improve during weekends, holidays and vacations
	Chronic bronchitis	Chronic cough with sputum production on a daily basis for a minimum of three months
		Typically occurs in smokers
Respiratory infection
	Sinusitis	Tenderness over the sinuses
		Postnasal drainage
	Common cold	Upper airway inflammation and no evidence of bronchial wheezing
	Pneumonia	Evidence of infiltrate on the chest radiograph
Other causes
	Congestive heart failure	Basilar rales
		Orthopnea
		Cardiomegaly
		Evidence of increased interstitial or alveolar fluid on the chest radiograph
		S3 gallop
		Tachycardia
	Reflux esophagitis	Intermittent symptoms worse when lying down
		Heartburn
	Bronchogenic tumor	Constitutional signs often present
		Cough chronic, sometimes with hemoptysis
	Other aspiration syndromes	Usually related to a precipitating event, such as smoke inhalation
		Vomiting
		Decreased level of consciousness