Coughing up phlegm when you don’t have a cold could be due to a number of different conditions: a sinus infection, allergies with postnasal drip, pneumonia, smoking, asthma, heartburn, or even some medicines like angiotensin-converting enzyme (ACE) inhibitors for high blood pressure. If you've had a cough for more than two weeks, call your doctor.
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- Q What can cause a cough?
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- Q What causes pulmonary alveolar proteinosis?