What Causes a Persistent Cough and When Should You See a Doctor?
Adult · Cough
A persistent cough lasting more than 8 weeks may be linked to asthma, post-nasal drip, acid reflux, infection, smoking, pollution or certain medicines. A doctor can help identify the cause.
We all know coughing helps clear our airways- but when it lasts too long, it may signal an underlying problem.
What Is a Persistent Cough?
A cough that lasts more than 8 weeks and may need attention
What Causes a Persistent Cough?
Persistent cough may be caused by post-nasal drip, asthma, acid reflux, lingering infections, smoking, pollution or certain medicines.
- Post-nasal drip causes mucus to drip down the throat, triggering a cough.
- Asthma triggers can irritate the airways and cause coughing.
- Acid reflux can irritate the throat and lead to chronic coughing.
- Respiratory infections can cause a lingering cough after a cold.
- Smoking or pollution can irritate the lungs and cause coughing.
- Certain medicines can trigger coughing as a side effect.
What Should You Do If a Cough Lasts More Than 8 Weeks?
If a cough lasts more than 8 weeks, speak to a doctor about an examination and possible tests, including a chest X-ray. The doctor may assess triggers such as asthma, post-nasal drip and acid reflux.
Talk to your doctor:Check with general practitioner or specialist
Get checked:A physical exam and chest X-ray may help find the cause.
Check for triggers: Asthma, postnasal drip, and acid reflux are often checked first.
When should you seek urgent medical care for a persistent cough?
- Weight loss
- Coughing blood
- Fever or night sweats
- Thick, colored mucus
Disclaimer:
The information provided in this blog is to help you understand about cough, cold, and allergy a little better — it's not a substitute for seeing a doctor. Every person is different, so please check with a healthcare professional for advice specific to you or your child, especially before starting any medication or if symptoms last more than a few days. If you're ever worried, don't wait — reach out to your doctor.References:
- Alhajjaj MS, et al. Chronic Cough.[Updated 2024 Oct 7]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: : https://www.ncbi.nlm.nih.gov/books/NBK430791
- Shapiro JR, et al. What to Do with the Patient with Chronic Cough? A Simple Approach to a Difficult Problem. The Permanente Journal. 2004;8(3):27.