If you’re wondering how children get pneumonia, what germs cause it, or whether a cold can turn into pneumonia, this page explains the most common causes and risk factors in a clear, parent-friendly way.
About this assessment
Start with the most likely source—such as a worsening cold or flu, exposure to someone who was sick, an underlying lung issue, or aspiration—and get personalized guidance based on your child’s situation.
Pneumonia is a lung infection that can happen when viruses, bacteria, or less commonly other germs reach the lungs and cause inflammation. In many children, pneumonia starts after a cold, flu, or another respiratory infection that weakens the body’s normal defenses. Some children develop pneumonia after close contact with someone who is sick, while others are more likely to get it because of asthma, chronic lung problems, swallowing difficulties, or a weakened immune system.
Viral pneumonia causes in children often include viruses that also cause colds, flu, RSV, or other respiratory illnesses. A virus can infect the lungs directly or begin as an upper respiratory infection that moves deeper into the chest.
Bacterial pneumonia causes in children include bacteria that can spread through droplets or develop after a viral illness. In some cases, a child seems to be improving from a cold or flu and then develops new fever, worsening cough, or breathing symptoms.
Sometimes pneumonia happens when food, liquid, vomit, or another substance goes down the wrong way into the lungs. This is called aspiration and can irritate the lungs or introduce germs that lead to infection.
A recent viral illness can make it easier for germs to reach the lungs. This is one reason parents ask whether a cold can turn into pneumonia in children.
Children with asthma or chronic lung issues may have more airway inflammation or mucus buildup, which can increase the chance of lower respiratory infections.
Infants, toddlers, and children with immune system challenges may have a harder time fighting off the germs that cause pneumonia.
Many cases are linked to common respiratory viruses, including influenza and other viruses that spread easily in homes, schools, and daycare settings.
RSV and related viruses can cause significant lower respiratory illness in younger children and may lead to pneumonia, especially during peak respiratory virus seasons.
Certain bacteria are well-known causes of pneumonia in children. A clinician may consider bacterial pneumonia when symptoms are more severe, localized, or worsen after a viral illness.
Yes. A cold or other viral infection can sometimes lead to pneumonia if the infection spreads into the lungs or if bacteria take hold after the child’s airways have been irritated by the original illness.
Children can catch pneumonia from viruses or bacteria spread by coughing, sneezing, or close contact. They can also develop it after another respiratory illness, or less commonly after aspiration when food or liquid enters the lungs.
Both can cause pneumonia. Viral pneumonia is common, especially in younger children, while bacterial pneumonia can also occur and may sometimes follow a viral infection. The likely cause depends on the child’s age, symptoms, exposures, and medical history.
Yes. Pneumonia risk factors in children include young age, asthma, chronic lung disease, immune system problems, recent viral illness, and swallowing or aspiration concerns.
Personalized assessment
Answer a few questions about recent illness, exposures, and health history to get an assessment tailored to common pneumonia causes in children.