Chronic cough: symptoms, treatment, and when to worry
Last updated September 3, 2026.
A chronic cough is one lasting more than 8 weeks in adults, and it almost always has a findable cause. The big three are postnasal drip, asthma (including cough-variant asthma where the cough is the only symptom), and acid reflux. A medication side effect, most famously ACE inhibitor blood pressure pills, and smoking round out the usual suspects.
How is the cause found?
The history does most of the work: when it started, what triggers it, whether it comes with wheeze, heartburn, or nasal symptoms, what medicines you take, and whether you smoke. An exam, a chest X-ray, and sometimes lung function tests follow. Treatment is then targeted at the cause: a nasal steroid spray for postnasal drip, an inhaler trial for asthma, reflux measures, or a medication switch. Many people need two of these addressed at once.
What actually helps?
- Stop smoking: the single most effective intervention when smoking is in the picture, and vaping counts as an irritant too.
- Review your medicines: ACE inhibitor blood pressure pills cause a dry tickly cough in a meaningful minority; a switch often fixes it within weeks. Never stop a heart or blood pressure medicine without the prescriber.
- Treat the nose: saline rinses and a steroid nasal spray calm the postnasal drip that triggers night and morning coughing.
- Treat reflux silently: late meals, caffeine, and alcohol feed a reflux cough even without heartburn; earlier, smaller dinners and bed-head elevation help.
- Honey and hydration for comfort: honey in warm water soothes the throat while the cause is being treated. Not for children under one.
- Follow the plan through: cause-targeted treatments take weeks to show their effect, so a treatment that seems to fail at one week has usually not been given its chance.
When is it an emergency?
A chronic cough is a book-an-appointment problem, but some features shortcut the queue: coughing up blood, unexplained weight loss, drenching night sweats, persistent fever, new or worsening breathlessness, chest pain, or a cough in someone with a history of cancer or heavy smoking. Any of those means prompt review within days. Sudden severe breathlessness or coughing up more than streaks of blood is a 911 call. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
When is a cough considered chronic?
In adults, a cough lasting more than 8 weeks is chronic. Between 3 and 8 weeks it is subacute, often a post-viral cough slowly fading after an infection. Anything under 3 weeks is acute, usually a cold. In children the chronic line is drawn at 4 weeks. The thresholds matter because the causes and the urgency differ on each side of them.
What are the most common causes of a chronic cough?
Three causes account for the large majority: postnasal drip from nose or sinus trouble, asthma including the cough-only variant, and acid reflux, sometimes without any heartburn. Medication side effects, especially ACE inhibitors, and smoking-related airway irritation make up most of the rest. Less common causes include lung diseases and, rarely, cancer, which is why red flags get checked rather than assumed away.
Can blood pressure pills cause a cough?
ACE inhibitors, the drugs ending in -pril like lisinopril and ramipril, cause a persistent dry, tickly cough in a meaningful share of people who take them. It can start months after beginning the drug and typically resolves within one to four weeks of switching to an alternative like an ARB. Do not stop the medication on your own; blood pressure control matters, and the switch is simple for the prescriber.
Why is my cough worse at night?
Lying flat lets postnasal drip pool on the throat and lets stomach contents drift up, so both of the common causes amplify overnight. Asthma also follows a daily rhythm and tightens in the early hours. Night-predominant coughing, especially with wheeze or a choking sensation on lying down, is useful diagnostic information, so mention the timing pattern when you are assessed.
Do cough syrups work for a chronic cough?
They mask rather than fix, and the evidence for over-the-counter cough medicines is weak even for that. A chronic cough has a cause, and treating the cause is what ends it. Honey in warm water is a reasonable soother with actual evidence behind it. If you are reaching for cough syrup nightly for weeks, the useful move is finding out why the cough exists, not a better syrup.
Could a chronic cough be lung cancer?
It is the fear everyone carries, and the honest answer is that the big three benign causes explain the overwhelming majority of chronic coughs. The pattern that changes the odds: a new or changed cough in a current or former heavy smoker, especially with coughing blood, weight loss, chest pain, or worsening breathlessness. Those features prompt a chest X-ray promptly, which is exactly why they are flagged rather than watched.