Respiratory disease

Respiratory Disease

Global distribution of respiratory diseases by disability-adjusted life years (DALY) in 2004.

Respiratory diseases are a group of diseases that affect the respiratory system, which includes the lungs, airways, and other structures involved in breathing. These diseases can range from mild and self-limiting, such as the common cold, to life-threatening conditions like chronic obstructive pulmonary disease (COPD) and lung cancer.

Types of Respiratory Diseases

Respiratory diseases can be classified into several categories based on the part of the respiratory system they affect and their underlying causes.

Obstructive Lung Diseases

Obstructive lung diseases are characterized by a narrowing of the airways, which makes it difficult to exhale all the air from the lungs. Common obstructive lung diseases include:

• Asthma: A chronic inflammatory disease of the airways that causes episodes of wheezing, breathlessness, chest tightness, and coughing.
• Chronic Obstructive Pulmonary Disease (COPD): A progressive disease that includes emphysema and chronic bronchitis. It is primarily caused by long-term exposure to irritating gases or particulate matter, most often from cigarette smoke.

Histological image of emphysema, a type of COPD.

Restrictive Lung Diseases

Restrictive lung diseases are characterized by a reduction in lung volume, making it difficult to fully expand the lungs with air. Examples include:

• Pulmonary fibrosis: A condition where lung tissue becomes damaged and scarred, leading to stiff and thickened lung tissue.
• Sarcoidosis: An inflammatory disease that affects multiple organs, particularly the lungs and lymph glands.

Infectious Respiratory Diseases

Infectious respiratory diseases are caused by pathogens such as bacteria, viruses, and fungi. Common infectious respiratory diseases include:

• Pneumonia: An infection that inflames the air sacs in one or both lungs, which may fill with fluid.
• Tuberculosis (TB): A serious infectious disease that mainly affects the lungs, caused by the bacterium Mycobacterium tuberculosis.

Upper Respiratory Tract Infections

Upper respiratory tract infections affect the nose, throat, and airways. They include:

• Common cold: A viral infection of the upper respiratory tract.
• Croup: A viral infection that causes swelling of the airways and a characteristic "barking" cough.

X-ray showing the "steeple sign" in croup.

Symptoms

Symptoms of respiratory diseases vary depending on the specific condition but often include:

• Coughing
• Shortness of breath
• Wheezing
• Chest pain
• Fatigue

Diagnosis

Diagnosis of respiratory diseases typically involves a combination of medical history, physical examination, and diagnostic tests such as:

• Chest X-ray: Used to visualize the lungs and airways.
• Pulmonary function tests: Measure how well the lungs are working.
• CT scan: Provides detailed images of the lungs and other structures.

Chest X-ray showing pulmonary interstitial emphysema.

Treatment

Treatment for respiratory diseases depends on the specific condition and its severity. Common treatments include:

• Medications: Such as bronchodilators, steroids, and antibiotics.
• Oxygen therapy: For patients with severe respiratory distress.
• Surgery: In cases of lung cancer or severe emphysema.

Prevention

Preventive measures for respiratory diseases include:

• Avoiding smoking and exposure to secondhand smoke.
• Vaccinations for preventable diseases like influenza and pneumonia.
• Wearing masks in environments with high levels of air pollution.

Epidemiology

Respiratory diseases are a leading cause of morbidity and mortality worldwide. The burden of these diseases varies by region and is influenced by factors such as air quality, smoking rates, and access to healthcare.

Global deaths from respiratory diseases per million persons in 2012.

Related Pages

• Lung cancer
• Bronchitis
• Pulmonary embolism
• Sleep apnea