A cough that won’t quit usually has a treatable cause, and finding that cause is the fastest path to relief. Clinicians define a chronic cough as one lasting longer than eight weeks in adults (four weeks in children). The three most common culprits are postnasal drip, asthma, and acid reflux, and each one responds to different strategies. While you work on identifying the root problem, several home treatments and over-the-counter options can dial down the coughing.
Why Your Cough Won’t Go Away
A cough that sticks around for weeks rarely means something is seriously wrong with your lungs. In most cases, it traces back to one of three conditions, sometimes two or three at once.
Postnasal drip (upper airway cough syndrome): Mucus from your sinuses drips down the back of your throat, tickling the cough reflex. Allergies, sinus infections, and irritants like dust or dry air are common triggers. You might notice throat clearing, a scratchy feeling, or a worsening cough at night when you lie down.
Asthma: Some people have a variant of asthma where a dry cough is the primary symptom, with little or no wheezing. Cold air, exercise, or allergens can set it off. If your cough is worse at night or early morning, this is worth considering.
Acid reflux: Stomach acid can travel up into the throat without causing obvious heartburn, a condition sometimes called silent reflux. The acid irritates the voice box and airway, triggering a persistent cough. Clues include a hoarse voice, a lump-in-the-throat sensation, or coughing after meals.
Less commonly, a constant cough is a side effect of medication. Blood pressure drugs called ACE inhibitors cause a cough in 5% to 35% of people who take them. If you started one of these medications and then developed a cough, switching to a different blood pressure drug typically resolves it within one to four weeks, though it can linger for up to three months.
Home Strategies That Help Right Now
Adjust Your Indoor Air
Dry air irritates your airways and makes coughing worse. A humidifier can help, but the sweet spot for indoor humidity is 30% to 50%. Going higher than that encourages mold, dust mites, and bacteria, all of which can trigger their own breathing problems and make a cough worse. A simple hygrometer (available for a few dollars at hardware stores) lets you monitor the level. Clean your humidifier regularly to prevent it from becoming a source of the very irritants you’re trying to avoid.
Try Honey
Honey performs about as well as common over-the-counter cough medicines in clinical studies. Half a teaspoon to one teaspoon (2.5 to 5 mL) can coat the throat and reduce coughing, especially at bedtime. You can take it straight, stir it into warm water, or mix it into non-caffeinated tea. One important caveat: never give honey to a child under one year old due to the risk of infant botulism.
Use a Saline Nasal Rinse
If postnasal drip is behind your cough, flushing your nasal passages with salt water is one of the most effective things you can do. You can use a neti pot, a squeeze bottle, or a prefilled saline kit. To make your own solution, mix one to two cups of distilled or previously boiled water with a quarter to half teaspoon of non-iodized salt. Lean over a sink, tilt your head to one side, and let the solution flow into one nostril and out the other. Breathe through your mouth during the process, and blow your nose gently afterward. Once or twice a day while you have symptoms is a safe frequency. Always use distilled or boiled (then cooled) water, never straight tap water.
Over-the-Counter Medications
Cough medicines fall into two categories, and choosing the wrong one can be unhelpful or even counterproductive.
Cough suppressants (containing dextromethorphan) work by dampening the cough reflex in your brain. They’re best for a dry, non-productive cough that’s keeping you up at night or making it hard to function. That said, their effect is modest. Clinical trials show suppressant effects of less than 20% in some cases, and several studies found no significant reduction in cough frequency at standard doses. At higher doses (around 60 mg), one study found cough counts dropped by about 50% in people with chronic bronchitis.
Expectorants (containing guaifenesin) take the opposite approach. Instead of stopping the cough, they thin and loosen mucus so your cough becomes more productive and effective at clearing your airways. These make more sense when you feel congested or when mucus is thick and hard to bring up. Results in studies are mixed: some found meaningful improvement in cough severity, while others showed no significant effect.
Avoid taking a suppressant and an expectorant at the same time. Suppressing the cough reflex while loosening mucus works at cross purposes.
Treating Reflux-Related Cough
If you suspect acid reflux is driving your cough, lifestyle changes can make a noticeable difference before you ever reach for medication. Eating a low-acid diet is one of the most important steps. Focus on foods like melons, bananas, green leafy vegetables, and celery. Avoid spicy, fried, and fatty foods, along with citrus, tomatoes, chocolate, peppermint, cheese, and garlic. Cut back on caffeine, carbonated drinks, and alcohol.
Meal timing matters too. Try eating your largest meal at midday or in the morning rather than in the evening, and stop eating at least three hours before bed. Eating slowly and without distractions helps reduce the amount of air you swallow and gives your digestive system time to work properly. Elevating the head of your bed by six inches (using blocks under the bed frame, not just extra pillows) keeps gravity working in your favor overnight.
Maintaining a healthy weight and managing stress also reduce reflux episodes. If these changes don’t improve your cough within a few weeks, over-the-counter acid reducers are the next step, and your doctor can guide you toward the right type.
Red Flags That Need Prompt Attention
Most constant coughs are annoying but not dangerous. However, certain symptoms alongside a persistent cough point to something that needs evaluation sooner rather than later:
- Coughing up blood
- Unexplained weight loss
- Fever that won’t resolve
- Hoarseness that persists
- Excessive shortness of breath
- Recurrent pneumonia
- Large amounts of sputum production
A significant smoking history (roughly 20 pack-years or more) combined with a new or changing cough also warrants a closer look. These red flags don’t automatically mean something severe, but they do mean a chest X-ray or further workup is worthwhile.
What Happens if Nothing Works
When a cough persists despite treating the usual suspects, doctors call it refractory chronic cough. This means the nerve pathways controlling your cough reflex have become hypersensitive, firing at stimuli that wouldn’t normally trigger a cough: a change in temperature, talking, laughing, or even certain smells.
A new class of medications targeting this nerve hypersensitivity has been developed. These drugs block specific receptors on the sensory nerves in your airway. The most studied of them, gefapixant, significantly reduces cough frequency in clinical trials, but 59% to 69% of patients at the effective dose experience taste disturbances (things tasting different or muted), and 16% to 20% stop taking it because of that side effect. Newer versions of these drugs aim to preserve the cough-reducing benefit while minimizing taste problems, though their effectiveness appears to be lower.
Speech therapy techniques that retrain the cough reflex are another option for refractory cases. A speech-language pathologist can teach you breathing exercises and throat relaxation strategies that reduce the urge to cough. This approach has no side effects and works well alongside other treatments.