Pneumonia: Symptoms, Causes & Treatment

Pneumonia is an infection of the lower respiratory tract in which the alveoli (small air sacs in the lungs responsible for gas exchange) become inflamed and fill with fluid or pus. This impairs the body's ability to absorb oxygen efficiently, resulting in respiratory symptoms and various clinical manifestations.

Pneumonia is a contagious disease spread through respiratory droplets from an infected person to another. It results from bacterial, viral, or fungal infection, with bacteria (particularly Streptococcus pneumoniae) being the most common cause. In the Middle East and Jordan specifically, pneumonia cases rise during cold seasons and are particularly prevalent in high-risk groups including the elderly, children, and immunocompromised individuals.

Pneumonia can range from mild cases (called "walking pneumonia") to severe cases requiring hospitalization. Early diagnosis and prompt treatment with appropriate antibiotics significantly improve health outcomes and reduce the risk of complications.

Symptoms of pneumonia vary depending on disease severity, patient age, and type of pathogen. Symptoms may develop gradually (over days) or suddenly (within hours). Young children and elderly adults may experience less obvious or atypical symptoms.

• Persistent cough: Initially dry, progressing to productive cough with clear, yellow, green, or blood-tinged sputum.
• Fever: Body temperature elevation (38°C or higher), potentially very high in severe cases.
• Shortness of breath (dyspnea): Difficulty breathing or abnormal respiratory rate, especially with exertion.
• Chest pain: Sharp pain when breathing or coughing, especially if the pleura (lung lining) is inflamed.
• Fatigue and general weakness: Feelings of extreme tiredness and physical weakness.
• Headache and muscle aches: Headache and pain in muscles and joints.
• Nausea and vomiting: Gastrointestinal symptoms may accompany the illness.
• Mental confusion: Especially in elderly adults, may indicate a severe case.
• Tachycardia: Noticeable increase in heart rate.
• Cyanosis: Bluish lips and nails, indicating oxygen deprivation in severe cases.

• Bacteria: Streptococcus pneumoniae and gram-negative bacilli are the most common bacterial causes of community-acquired pneumonia.
• Viruses: Influenza virus, coronavirus (COVID-19), and respiratory syncytial virus (RSV) can cause viral pneumonia.
• Fungi: Fungal species such as Candida and Pneumocystis may cause pneumonia, especially in immunocompromised individuals.
• Aspiration: Inhalation of stomach contents or chemical substances can cause aspiration pneumonia.
• Bloodborne infection: Spread of infection from another body site to the lungs.
• Other medical conditions: Chronic diseases, surgical procedures, and mechanical ventilation increase the risk of hospital-acquired pneumonia.

• Age: Children under 5 years and adults over 65 years are at higher risk for severe infection.
• Weakened immunity: People with HIV or undergoing chemotherapy are at significantly higher risk.
• Chronic diseases: COPD, asthma, diabetes, and heart disease increase pneumonia susceptibility.
• Smoking: Smokers and even passive smokers have increased susceptibility.
• Malnutrition: Lack of vitamins and minerals weakens the immune system.
• Alcohol and drugs: Substance abuse weakens immunity and lung defenses.
• Environmental exposure: Prolonged exposure to pollutants and harmful gases.
• Neurological disorders: Conditions like stroke increase aspiration pneumonia risk.

Diagnosis is based on a combination of clinical examination, laboratory tests, and radiographic imaging. Pneumonia cannot be diagnosed by symptoms alone; confirmatory tests must be performed, especially in severe cases or hospitalized patients.

• Clinical examination: The physician listens to the chest with a stethoscope for abnormal sounds (crackles or dullness), checks pulse, blood pressure, and body temperature, and assesses degree of respiratory distress.
• Chest X-ray: The primary diagnostic test showing areas of opacity (infiltrate) in the lung, typically in lower lobes.
• CT scan: Used in complex or unclear cases for more detailed imaging.
• Complete blood count (CBC): Shows elevated white blood cells (WBC > 11,000 cells/mcL in bacterial cases), indicating active infection.
• Blood chemistry tests: Measure liver and kidney function and inflammation markers (CRP, ESR).
• Blood and sputum cultures: Samples identify the pathogen precisely, guiding antibiotic selection.
• Pulse oximetry: Measures blood oxygen saturation; normal value > 95%. Low readings indicate hypoxemia.
• Arterial blood gas (ABG): Measures arterial blood gases to assess gas exchange in severe cases.

Medications

• Antibiotics: Primary treatment for bacterial pneumonia. Common options include amoxicillin, azithromycin, and ceftriaxone. Selection depends on identified bacteria and disease severity. Treatment typically lasts 7-14 days.
• Antiviral medications: Given for viral pneumonia, especially influenza (e.g., oseltamivir/Tamiflu).
• Fever reducers and pain relievers: Acetaminophen and ibuprofen reduce fever and pain, though excessive use should be avoided as fever aids immune response.
• Cough medications: Products containing dextromethorphan may calm dry cough, but productive cough should not be suppressed as it helps clear secretions.

Procedures and Supportive Care

• Oxygen therapy: Given to patients with oxygen deprivation (SpO2 < 92%), via nasal cannula, face mask, or mechanical ventilation in severe cases.
• Intravenous fluids: Administered to hospitalized patients to prevent dehydration and maintain electrolyte balance.
• Respiratory therapy: May include deep breathing exercises and incentive spirometry to improve ventilation and secretion drainage.
• Hospital supportive care: Continuous vital sign monitoring, complete bed rest, and proper nutrition to support immunity.

Lifestyle Changes

• Complete rest: Bed rest for several days until acute symptoms improve.
• Stay hydrated: Drink plenty of water and warm fluids like tea and broth to thin mucus and ease coughing.
• Avoid smoking and pollutants: Eliminate smoking and chemical vapors that may trigger coughing.
• Improve air quality: Use a humidifier to add moisture and ease breathing.
• Good nutrition: Eat foods rich in vitamins, minerals, and protein to support immunity.
• Avoid physical strain: Do not exercise strenuously during illness; gradually resume activity after recovery.

• Acute Respiratory Distress Syndrome (ARDS): A very serious condition with severe respiratory failure and critical oxygen deprivation, potentially life-threatening requiring intensive respiratory support.
• Sepsis/Bloodstream infection: Spread of infection to the bloodstream potentially causing septic shock and multi-organ failure.
• Pleural effusion and pneumothorax: Fluid accumulation around the lungs or collapsed lung (pneumothorax), potentially requiring drainage or surgical intervention.
• Pleuritis (pleural inflammation): Inflammation of the lung lining causing severe breathing pain.
• Heart failure: Pressure from inflammation may impair heart function.
• Lung abscess: Localized pus collection in lung tissue potentially requiring drainage.
• Myocarditis and pericarditis: Rare but serious complications affecting the heart muscle and surrounding membrane.

• Vaccinations: Receive annual flu vaccine and pneumococcal vaccines (PCV and PPSV23), especially for high-risk groups and adults over 65.
• Personal hygiene: Wash hands regularly and properly with soap and water, especially before eating and after bathroom use, and avoid touching face and eyes.
• Avoid smoking: Refrain from smoking and secondhand smoke exposure which weakens respiratory defenses.
• Practice social distancing: Avoid close contact with people with respiratory infections, and stay home when sick.
• Boost immunity: Get adequate sleep (7-9 hours), exercise regularly, and maintain balanced nutrition rich in fruits, vegetables, and proteins.
• Avoid environmental pollutants: Reduce exposure to air pollutants, smog, and harmful gases.
• Healthy cough etiquette: Cover mouth and nose when coughing or sneezing with your elbow or tissue, and discard tissue immediately.
• Consult doctor at early symptoms: Do not ignore cold and flu symptoms; seek treatment early.