See your doctor if you have difficulty breathing, chest pain, persistent fever of 102 F (39 C) or higher, or persistent cough, especially if you're coughing up pus. It's especially important that people in these high-risk groups see a doctor:
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Adults older than age 65
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Children younger than age 2 with signs and symptoms
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People with an underlying health condition or weakened immune system
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People receiving chemotherapy or taking medication that suppresses the immune system
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For some older adults and people with heart failure or chronic lung problems, pneumonia can quickly become a life-threatening condition.