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Understanding Pneumonia: Causes, Symptoms, and Treatment Options

Oghenefejiro Okifo | MD

Medically reviewed by Oghenefejiro Okifo | MD, Harvard Medical School | Henry Ford Hospital - Detroit, MI on November 28th, 2023.

Key Takeaways

  • Streptococcus pneumoniae causes 60-70% of bacterial cases, while viruses like influenza, RSV, and COVID-19 account for about 30% of all infections, with fungal causes more common in immunocompromised patients.

  • Community-acquired cases typically resolve in 1-3 weeks with appropriate antibiotics, but hospital-acquired infections have higher resistance rates and may require 7-10 days of IV treatment.

  • Adults over 65 and those with COPD, diabetes, or heart disease have 3-5 times higher risk of severe complications including sepsis and respiratory failure requiring ICU care.

  • Chest X-rays show characteristic "consolidation" patterns, while blood tests reveal elevated white cell counts (often >15,000/μL) and inflammatory markers like C-reactive protein.

  • Pneumococcal vaccines (PCV13 and PPSV23) prevent up to 75% of invasive disease in healthy adults, with timing dependent on age and underlying conditions—typically given as a series starting at age 65.

Pneumonia is a lung infection that can affect anyone, but it is more common in children under 2 and adults over 65. The severity of pneumonia can range from mild to life-threatening, requiring hospitalization. In this article, we'll explore the causes, symptoms, risk factors, diagnosis, treatment, and prevention of pneumonia.

What Causes Pneumonia?

Pneumonia occurs when an infection causes the air sacs (alveoli) and airways in your lungs to fill with fluid or pus, making it difficult to breathe. The most common causes of pneumonia include:

  • Bacteria, such as Streptococcus pneumoniae

  • Viruses, like influenza, cold viruses, and RSV

  • Fungi, such as Coccidioidomycosis and Cryptococcus

You can also develop pneumonia by inhaling foreign substances, like vomit or saliva, which is known as aspiration pneumonia.

Symptoms of Pneumonia

The symptoms of pneumonia can vary depending on the cause, age, and overall health of the individual. Common signs and symptoms include:

  • Cough with phlegm or mucus production

  • Fever and chills

  • Shortness of breath or difficulty breathing

  • Chest pain when breathing or coughing

  • Fatigue and loss of appetite

  • Nausea, vomiting, or diarrhea

Understanding Pneumonia: Causes, Symptoms, and Treatment Options

Risk Factors for Pneumonia

While anyone can get pneumonia, certain factors can increase your risk, such as:

  • Having a chronic lung condition, like asthma or COPD

  • Suffering from other serious health conditions, such as heart disease or diabetes

  • Having a weakened immune system due to conditions like AIDS or cancer treatment

  • Being exposed to cigarette smoke or environmental irritants

  • Misusing alcohol or drugs

Diagnosing Pneumonia

To diagnose pneumonia, your doctor will start by asking about your symptoms and medical history. They may also perform a physical exam, listening to your lungs for crackling, bubbling, or rumbling sounds. Additional tests may include:

  • Chest X-ray to visualize the infection in your lungs

  • Blood tests to check for signs of bacterial infection

  • Pulse oximetry to measure the oxygen levels in your blood

  • Sputum test to identify the cause of the infection

In more severe cases or for those with underlying health conditions, your doctor may recommend further tests, such as a CT scan, bronchoscopy, or pleural fluid culture.

Treating Pneumonia

The treatment for pneumonia depends on the cause, severity, and the individual's overall health. Most people can recover at home with rest and proper medication, which may include:

  • Antibiotics for bacterial pneumonia

  • Antiviral medications for some types of viral pneumonia

  • Antifungal medication for fungal pneumonia

  • Over-the-counter pain relievers and fever reducers

In more severe cases, hospitalization may be necessary. Treatment in the hospital may involve intravenous fluids, antibiotics, oxygen therapy, or breathing treatments.

Preventing Pneumonia

To reduce your risk of developing pneumonia, consider the following preventive measures:

  • Get vaccinated against pneumonia, flu, and other diseases that can lead to pneumonia

  • Practice good hygiene, such as washing your hands frequently and avoiding close contact with sick individuals

  • Don't smoke and avoid exposure to secondhand smoke

  • Maintain a healthy lifestyle by exercising, eating a balanced diet, and getting enough sleep

If you suspect that you or a loved one has pneumonia, seek medical attention promptly. Early diagnosis and treatment can help prevent complications and ensure a faster recovery.

For more information on pneumonia, visit:

The Bottom Line

Early antibiotic treatment within 4-8 hours of hospital presentation significantly reduces mortality risk and length of stay. High-risk individuals should prioritize vaccination and seek prompt medical attention for persistent fever above 101°F combined with productive cough. If you're experiencing chest pain with breathing difficulties or concerning respiratory symptoms, Doctronic can help evaluate your symptoms and determine if immediate care is needed.

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