Overview
A cough is a reflex that helps protect the lungs by clearing mucus, germs, and irritants from the airways. It may happen suddenly for a short time or continue for weeks. Cough itself is a symptom, not a disease, so the meaning depends on what is causing it and what other symptoms are present.
Key Symptoms
A cough may be dry, tickly, barking, or produce mucus. It can happen during the day, at night, after exercise, or after exposure to smoke, cold air, or strong smells. Other symptoms may include fever, sore throat, runny nose, wheezing, heartburn, shortness of breath, or chest discomfort.
Causes and Risk Factors
Common causes include viral infections such as colds or flu, COVID-19, asthma, allergies, postnasal drip, acid reflux, and irritation from smoking or air pollution. Bacterial infections, chronic lung disease, and some medicines can also cause coughing. Risk factors depend on the cause and may include tobacco exposure, crowded settings, polluted air, workplace dust, and underlying heart or lung conditions.
Who Is Affected
Cough can affect people of any age. Children often cough with common viral infections, while adults may also have cough related to smoking, workplace exposure, reflux, or long-term lung conditions. Older adults, pregnant people, and those with asthma, COPD, weakened immune systems, or heart disease may need earlier medical attention if symptoms are significant.
Prevention
Prevention depends on the cause but often includes handwashing, staying up to date with recommended vaccines, avoiding tobacco smoke, and reducing exposure to dust and polluted air. Managing allergies, asthma, or reflux can also help prevent repeated coughing. Good indoor ventilation and wearing recommended protective equipment at work may lower exposure to irritants.
Diagnosis and Tests
A healthcare professional may ask how long the cough has lasted, whether mucus is present, and what other symptoms you have. They may review smoking history, medicine use, travel, sick contacts, and possible allergen or workplace exposure. Depending on the situation, testing may include viral testing, lung function testing, chest imaging, or other evaluations to look for the cause.
Treatment Categories
Treatment depends on the cause, such as supportive care for viral illness or targeted treatment for asthma, allergies, reflux, or infection when appropriate. Non-medicine approaches may include rest, fluids, avoiding smoke and irritants, and using a humidified environment if advised by a clinician. Because coughing has many causes, treatment should match the underlying problem rather than the symptom alone.
When to Seek Medical Care
Seek medical care if a cough lasts more than a few weeks, keeps coming back, disrupts sleep, or is getting worse. Medical evaluation is also important if you have fever that does not improve, wheezing, weight loss, dehydration, or thick or foul-smelling mucus. Infants, older adults, and people with chronic health conditions may need care sooner.
When It May Be an Emergency
Get urgent help right away if coughing comes with severe trouble breathing, blue or gray lips, chest pain, confusion, fainting, or coughing up blood. Emergency care is also important if a child is struggling to breathe, making high-pitched breathing sounds, or may have choked on something. These symptoms can signal a serious problem that should not wait.