What can cause a cough?

Gerard W. Frank, MD on behalf of UCLA Health

Pulmonary Disease

Coughing can be caused by many conditions, including the following:

cold
flu
postnasal drip
pneumonia
bronchitis
allergies
asthma
irritation from smoking
sinus conditions
acid reflux (GERD)
cancer
tuberculosis
aspiration (particularly in people who have had a stroke)

Coughing is also a possible side effect of many medications.

Univ. of Nev. School of Medicine, Family Medicine

Coughs can be caused by infection or anything that causes irritation in the airway.

Common causes of a cough are:

infections from viruses, bacteria and fungi
allergies
coming into contact with smoke or fumes
asthma
acid reflux

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.

Lung Disease and Respiratory System

Diseases, pollutants and genetics can affect your respiratory health. The simple cold - which is caused by more than 200 different viruses - inflames the upper respiratory tract, resulting in a cough, runny nose and sneezing. A more severe cough combined with mucus is a sign of bronchitis, where the membranes lining the bronchial tubes become inflamed. The inflammatory lung disease asthma affects more than 20 million people, making airways constrict when exposed to irritants like dust, pet dander and cigarette smoke. Pneumonia, another inflammation of the lungs, can occur because of a bacterial or viral infection. People suffering from cystic fibrosis, an inherited lung disease, frequently battle bacterial infections and airways clogged with thick and sticky mucus.

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