Overview
A cough is a natural protective reflex that helps clear mucus, irritants, and foreign particles from the airways. When a cough continues for an extended period, it may indicate an underlying respiratory or non-respiratory condition. A persistent cough can be dry or produce mucus. The cause may range from relatively minor conditions such as post-nasal drip or a previous respiratory infection to conditions such as asthma, chronic bronchitis, gastroesophageal reflux disease (GERD), or other lung diseases. The duration and characteristics of the cough, along with associated symptoms and medical history, help determine the underlying cause.
Causes
Common causes of persistent cough include: Asthma Chronic bronchitis Post-nasal drip Allergies Gastroesophageal reflux disease (GERD) Smoking or exposure to tobacco smoke Previous respiratory infections Long-term exposure to dust, smoke, or other airway irritants Certain medications, including some blood-pressure medicines Chronic respiratory diseases Lung infections In some cases, a persistent cough may require investigation for more serious underlying conditions.
Risk Factors
Factors that may increase the likelihood of developing a persistent cough include: Smoking or exposure to secondhand smoke Asthma or other respiratory conditions Frequent respiratory infections Allergies Exposure to dust, chemicals, fumes, or air pollution Acid reflux Occupational exposure to airway irritants Certain medications A history of chronic lung disease
Diagnosis
The doctor may ask about the duration and characteristics of the cough, smoking history, medications, allergies, and other symptoms. Depending on the suspected cause, evaluation may include: Physical examination Chest X-ray Lung function tests such as spirometry Allergy assessment Blood tests when appropriate Sputum examination CT scan of the chest in selected cases Evaluation for acid reflux or other underlying conditions The appropriate tests depend on the patient's symptoms and medical history.
Treatment
Treatment depends on the underlying cause of the persistent cough. Possible treatments include: Treatment for asthma or airway inflammation Treatment of respiratory infections when appropriate Allergy treatment Management of acid reflux Smoking cessation Avoiding dust, smoke, fumes, and other airway irritants Medicines to control excessive mucus when appropriate Treatment of the underlying lung condition A cough suppressant may sometimes be recommended, but treating the underlying cause is generally more important than simply suppressing the cough.
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Prevention
Some measures that may help reduce the risk of persistent cough include: Avoid smoking and secondhand smoke Avoid exposure to dust, chemical fumes, and other respiratory irritants Maintain good indoor air quality Manage allergies and asthma properly Practice good hand hygiene to reduce respiratory infections Follow recommended vaccinations Treat acid reflux when present Seek medical advice when a cough does not improve
Complications
A persistent cough may sometimes lead to: Chest or abdominal muscle pain Difficulty sleeping Fatigue Headaches Urinary leakage Vomiting Worsening of an underlying respiratory condition In rare cases, severe or prolonged coughing can cause complications such as fainting, rib injury, or significant breathing difficulties.
When to See a Doctor
You should seek medical evaluation if a cough persists for several weeks, keeps getting worse, or interferes with normal daily activities or sleep. Seek urgent medical attention if persistent coughing is accompanied by: Coughing up blood Severe difficulty breathing Chest pain Blue or gray lips or skin Fainting or severe weakness High or persistent fever Unexplained weight loss Significant worsening of symptoms
Conditions Related to This Symptom
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