How Do You Get Pneumonia, and Is It Contagious?

Pneumonia is an infection of the lungs that causes the air sacs (alveoli) to fill with fluid or pus. It can make breathing difficult and may lead to serious complications, especially in young children, older adults, and people with weakened immune systems. Understanding how you get pneumonia and whether it’s contagious can help you take steps to protect yourself and your loved ones.

What Causes Pneumonia?

Pneumonia can be caused by various germs, including bacteria, viruses, and fungi. The most common culprits are:

• Bacteria

  • Streptococcus pneumoniae (pneumococcus)
  • Haemophilus influenzae
  • Mycoplasma pneumoniae (often called “walking pneumonia”)

• Viruses

  • Influenza (flu) viruses
  • Respiratory syncytial virus (RSV)
  • Coronaviruses (e.g., SARS-CoV-2)

• Fungi (less common, often affects those with weakened immunity)

  • Pneumocystis jirovecii
  • Histoplasma capsulatum
  • Cryptococcus neoformans

How Do You Get Pneumonia?

You “get” pneumonia when one of these pathogens reaches your lungs and overcomes your natural defense systems. Key routes of infection include:

1. Inhaling Infectious Droplets

   • When someone with a respiratory infection coughs or sneezes, tiny droplets containing bacteria or viruses can become airborne.
   • You breathe in these droplets and the germs settle in your lungs.

2. Aspiration (Breathing in Food, Drink, or Vomit)

   • If you have trouble swallowing—due to intoxication, sedation or a neurological condition—you may accidentally inhale liquids or particles into your lungs.
   • This can carry mouth bacteria deep into the lung tissue, leading to aspiration pneumonia.

3. Spread from Nearby Infections

   • Sometimes bacteria from a sinus or middle ear infection can travel down your respiratory tract into the lungs.

4. Bloodstream Infection

   • In rare cases, germs from another part of your body (e.g., a urinary tract infection) can enter the bloodstream and seed the lungs.

5. Hospital-Acquired (Nosocomial) Pneumonia

   • People on ventilators or with weakened immune systems in healthcare settings can develop pneumonia from bacteria present in that environment.

Is Pneumonia Contagious?

Whether pneumonia is contagious depends on its cause:

• Contagious Types

  • Bacterial pneumonia (e.g., pneumococcus, Mycoplasma) can spread through respiratory droplets.
  • Viral pneumonia (e.g., influenza, RSV, COVID-19) is also transmitted by droplets or direct contact.

• Non-Contagious Types

  • Aspiration pneumonia is caused by inhaling material that isn’t infectious.
  • Fungal pneumonia generally isn’t spread person-to-person; it’s acquired from environmental spores.

Key points on contagiousness:

• You’re most likely to spread bacterial or viral pneumonia before your symptoms start or during your first few days of illness.
• Good respiratory etiquette—covering coughs, wearing masks, frequent handwashing—lowers the risk of spreading germs.
• Close contacts (family, caregivers) are at higher risk, especially if they have weakened defenses or chronic lung conditions.

Who’s at Higher Risk?

Certain factors make it easier for pneumonia-causing germs to take hold:

• Age under 2 or over 65
• Chronic lung diseases (COPD, asthma)
• Heart disease, diabetes, or kidney problems
• Weakened immune systems (HIV, cancer treatments, steroids)
• Recent viral infection (like the flu or COVID-19)
• Hospitalization, especially if on a ventilator
• Smoking or exposure to secondhand smoke

Recognizing Early Signs

Knowing early symptoms can help you seek timely care. Common signs include:

• Persistent cough (may produce green, yellow or bloody mucus)
• Fever, chills and sweating
• Rapid, shallow breathing or shortness of breath
• Chest pain that worsens when you breathe or cough
• Fatigue, muscle aches, loss of appetite
• In older adults: confusion, low body temperature, weakness

If you’re unsure whether it’s a mild cold, the flu or pneumonia, you might consider a free, online symptom check, using the doctor approved Ubie Symptom Checker.

Preventing Pneumonia

While you can’t eliminate all risk, these steps help protect you and others:

• Vaccination

  • Pneumococcal vaccines for adults and children (consult your doctor)
  • Annual flu shot
  • COVID-19 vaccine and boosters as recommended

• Good Hygiene

  • Wash hands with soap and water (20 seconds minimum)
  • Use alcohol-based hand sanitizer when soap isn’t available
  • Cover coughs and sneezes with a tissue or your elbow

• Healthy Lifestyle

  • Don’t smoke and avoid secondhand smoke
  • Eat a balanced diet rich in fruits and vegetables
  • Get regular exercise and adequate sleep

• Reduce Exposure

  • Avoid close contact with people who are sick
  • Wear a mask in crowded or poorly ventilated areas if you’re at high risk

Treatment Overview

Treatment depends on the type and severity of pneumonia:

• Bacterial Pneumonia

  • Oral or intravenous antibiotics
  • Rest, fluids and fever-reducing medications

• Viral Pneumonia

  • Antiviral medications (for flu or COVID-19, when appropriate)
  • Supportive care: hydration, rest, oxygen therapy if needed

• Fungal Pneumonia

  • Antifungal medications in higher-risk patients

Always follow your healthcare provider’s instructions—finishing the full course of any prescribed antibiotic or antiviral is crucial.

When to Seek Immediate Medical Attention

Pneumonia can escalate quickly. Seek urgent care or call emergency services if you experience:

• Difficulty breathing or shortness of breath at rest
• Chest pain that’s severe or getting worse
• New confusion or inability to rouse
• Bluish lips or face
• Persistent high fever (above 103°F/39.4°C)

For less severe symptoms, speak to a doctor or consider a free, online symptom check, using the doctor approved Ubie Symptom Checker to guide your next steps.

Key Takeaways

• “How do you get pneumonia?” Answer: Germs enter your lungs via droplets, aspiration, bloodstream or hospital settings.
• Pneumonia can be bacterial, viral, fungal or aspiration-related.
• Bacterial and viral pneumonia are contagious; fungal and aspiration types usually are not.
• Prevention includes vaccines, hand hygiene, healthy habits and avoiding sick contacts.
• Treatment varies by cause—antibiotics for bacteria, antivirals for viruses, antifungals for fungi.
• Always consult a doctor for a proper diagnosis and follow-up care.

Speak to a healthcare professional if you notice worrying symptoms or if you belong to a high-risk group. Early diagnosis and treatment are key to a full recovery. And if you’re still unsure about your symptoms, you can do a free, online symptom check, using the doctor approved Ubie Symptom Checker.