pneumonia caused by bacteria in otherwise healthy
people younger than 65 usually come on suddenly. They often start during or
upper respiratory infection, such as
influenza or a cold, and may include:
- Cough, often producing
mucus (sputum) from the lungs. Mucus may be rusty or
green or tinged with blood.
- Fever, which may be less common in
- Shaking, "teeth-chattering" chills (one time only or
- Fast, often shallow, breathing and the feeling of
being short of breath.
- Chest wall pain that is often made worse by
coughing or breathing in.
- Fast heartbeat.
- Feeling very tired (fatigue) or feeling very weak
- Nausea and vomiting.
Symptoms of pneumonia not caused by bacteria (nonbacterial)
include fever, cough, shortness of breath, and little mucus when you cough.
They may come on gradually and are often less obvious and less severe than
those of bacterial pneumonia. Many people don't know that they have
nonbacterial pneumonia because they do not feel sick.
symptoms are mild, your doctor may call your condition "walking
Older adults and children
Older adults may have
different, fewer, or milder symptoms, such as no fever or a cough with no mucus
(a dry or nonproductive cough). The major sign of pneumonia in older adults may
be when there is a change in how clearly they think (confusion or
delirium) or when a lung disease they already have
In children, symptoms may depend on age:
- In infants younger than 1 month of age,
symptoms may include having little or no energy (lethargy), feeding poorly,
grunting, or having a fever.
- In children, symptoms of pneumonia are
often the same as in adults. Your doctor will look for signs such as cough and
a breathing rate over 60 breaths per minute.
Conditions that may look like pneumonia
chronic obstructive pulmonary disease (COPD), and
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