Symptom Guides

How Do You Get Rid of a Persistent Cough? Causes and Warning Signs

A cough usually clears up on its own within 3–4 weeks. For a cough lasting more than 8 weeks, the cause is investigated; coughing up blood or shortness of breath should not be left to wait.

6 October 2026 · 6 min read · DoktorClub Editorial Board

Translated from the Turkish original by DoktorClub. The Turkish version is the reference text; this English translation has not been separately reviewed by a physician. Read the Turkish original.

How Do You Get Rid of a Persistent Cough? Causes and Warning Signs

Key takeaway

According to NICE, a cough after a cold or flu usually clears up within 3–4 weeks without antibiotics. During this time, honey (over 1 year of age), plenty of fluids and rest can ease the symptoms. The European Respiratory Society (ERS) considers a cough lasting more than 8 weeks in adults to be chronic. With a chronic cough, rather than waiting for it to go away, the cause is investigated and treated. If you are coughing up blood, are short of breath or have unexplained weight loss, see a physician without delay. If you cough up a mouthful of blood or have sudden shortness of breath, call 112 (the emergency number in Türkiye).

Short Answer

How long must a cough last to count as "persistent"?

Physicians divide cough into three groups by duration. This distinction determines the likely cause and when tests are needed.

Duration	Name	Most common cause
Less than 3 weeks	Acute cough	Common cold, flu, acute bronchitis
3–8 weeks	Prolonged (subacute) cough	Post-infectious cough, whooping cough
More than 8 weeks	Chronic cough	Asthma, reflux, nose and sinus problems, smoking, medicines

This classification is based on the 2006 guideline of the American College of Chest Physicians (ACCP). In children, the ERS considers a cough lasting more than 4 weeks to be chronic.

What causes it?

Post-infectious cough: Even after a cold has passed, the airways remain sensitive for a while. The cough can last for weeks and gradually fades.

Asthma: According to the ERS, asthma-related cough is a common type of chronic cough. Sometimes it shows up only as a dry cough, without wheezing.

Reflux: Stomach contents backing up into the esophagus can trigger coughing. Details are in our guide to reflux and cough.

Postnasal drip (upper airway cough syndrome): Nose and sinus diseases can also accompany a cough. The ERS notes that how this condition leads to cough is still debated.

Smoking: According to the ERS, smoking is the most important correctable cause of chronic cough. Smoking is also closely linked to COPD (chronic obstructive pulmonary disease).

Blood pressure medicines: According to the ERS, chronic cough occurs in about 15% of people taking blood pressure medicines called ACE inhibitors. There may not always be a clear link between the cough and when the medicine was started.

More serious causes: Tuberculosis, pneumonia and lung cancer can also cause a long-lasting cough. In tuberculosis, the cough may be accompanied by fever, night sweats and weight loss.

What helps at home?

NICE recommends the following steps for a cough in the first 3–4 weeks:

Wait and watch: Most coughs go away on their own. Note whether it is getting worse.
Try honey: Use only in people older than 1 year. You can add it to warm water or herbal tea.
Drink plenty of fluids: This reduces throat dryness.
Rest: If you have a fever, stay at home.
Avoid smoke: If you smoke, get support to quit. Make sure no one smokes at home.
For fever and pain: Paracetamol or ibuprofen can be used. Do not exceed the dose on the package leaflet.

If you are pregnant or have kidney disease, liver disease or a stomach ulcer, ask your physician or pharmacist before taking a painkiller. If you take a blood thinner, consult them first as well.

In children

Do not give honey to a baby under 1 year old. At this age honey carries a risk of infant botulism (a serious poisoning that affects the nervous system).
NICE considers over-the-counter cough syrups for ages 12 and over. Ask a physician before giving syrup to a younger child.
According to the European Medicines Agency (EMA), cough medicines containing codeine should not be used under the age of 12.
According to the ERS, in a healthy young child with a sudden-onset cough, an inhaled foreign object should be considered. If you suspect this, be sure to tell the physician.
According to the CDC, coughing fits in whooping cough can last up to 10 weeks. In babies, pauses in breathing can occur without coughing.

For more, see our child health guides.

How is it diagnosed?

The physician first takes your history and examines you. You will be asked about how long the cough has lasted, the color of any phlegm, smoking and the medicines you take.

Chest X-ray: According to NICE, an urgent chest X-ray is ordered at age 40 and over if there are two unexplained symptoms. These symptoms are cough, fatigue, shortness of breath, chest pain, weight loss and loss of appetite.
In people who have ever smoked: Even a single symptom from the same list is enough for a chest X-ray.
Coughing up blood: According to NICE, unexplained coughing up of blood at age 40 and over leads to urgent referral for suspected cancer.
Breathing test (spirometry): Ordered when asthma or COPD is suspected.
CT scan: The ERS does not recommend routine CT scanning in chronic cough when the chest X-ray and examination are normal.

What not to do

Do not start antibiotics on your own: According to NICE, antibiotics are not recommended for a cold causing a cough. In acute bronchitis, too, antibiotics shorten the cough by only about half a day on average.
Do not give codeine syrup to a child: According to the EMA, there is a risk of respiratory depression under the age of 12.
Do not stop your blood pressure medicine on your own: If you think the cough is caused by the medicine, talk to your physician. If necessary, your physician will switch you to another medicine.
Do not use reflux medicine on your own for a long time: According to the ERS, stomach acid medicines may benefit cough only in people who have reflux symptoms.
Do not do steam inhalation with boiling water: A tipped-over container of boiling water can cause burns, especially in children. The benefit of heated humidified air in the common cold has also not been proven.
Do not spend weeks relying on syrups: See a physician for a cough lasting more than 3–4 weeks.

What does the evidence say?

Honey: A 2018 Cochrane systematic review found that in children, honey probably relieves cough more than no treatment and placebo. Most of the studies involved a single night of treatment.

Cough syrups: According to NICE, the expectorant guaifenesin and non-codeine cough suppressants may provide limited benefit over the age of 12. Antihistamine, decongestant and codeine syrups do not appear to help with cough.

Steam: A 2017 Cochrane review could not show either benefit or harm from heated humidified air in the common cold.

Mucus thinners and inhalers: NICE does not recommend mucolytics or bronchodilators for acute cough unless there is an underlying condition such as asthma.

In Türkiye

Antibiotics: According to the Turkish Ministry of Health, antibiotics are of no benefit in flu and the common cold. The Ministry also stresses that medicines should not be used except on a physician's advice.
Support to quit smoking: The Ministry of Health's ALO 171 Smoking Cessation Helpline provides support during the quitting process. The helpline's website also lists smoking cessation clinics.
Appointments: You can go directly to your family physician or book an appointment through MHRS (Türkiye's central hospital appointment system). You can access your previous X-rays through e-Nabız (Türkiye's national health record app).
Suspected poisoning: If a child has accidentally drunk cough syrup or another medicine, call 114, the National Poison Information Center. If there is drowsiness, slowed breathing or vomiting, call 112.

Which doctor should I see?

First step: Your family physician. Most coughs are evaluated here and referred if necessary.
Chronic cough or coughing up blood: Pulmonology (chest diseases).
Postnasal drip and sinus problems: Ear, Nose and Throat (ENT).
Reflux symptoms: Internal Medicine or Gastroenterology.
Children: Pediatrics; if necessary, Pediatric Pulmonology.
Bring with you: A list of all the medicines you take, your smoking history, any previous chest X-rays and the date the cough started.

When should I seek emergency care?

If you are coughing up a mouthful of blood, call 112.
If you have sudden shortness of breath, turn blue, or are too breathless to speak, call 112.
If you have sudden, severe chest pain, or chest pain together with shortness of breath, call 112.
If a child cannot breathe after a sudden coughing fit, or you suspect an inhaled foreign object, call 112.
If a baby turns blue or stops breathing after a coughing fit, call 112.
If a child has swallowed cough syrup or a medicine, call 114; if there is drowsiness or slowed breathing, call 112.
If you have a small amount of blood-streaked phlegm, chest pain that worsens with coughing, high fever, rapid worsening or chest retractions, see a physician the same day.
Make an appointment if you have unexplained weight loss, night sweats or a cough lasting more than 3–4 weeks.

Related guides

What changed? (October 2026)

New guide: cough durations, home care and warning signs brought together on a single page.
The NICE NG120 acute cough guideline, the ERS 2020 chronic cough guideline and NICE NG12, updated in April 2026, were followed.

Sources

NICE. Cough (acute): antimicrobial prescribing (NG120). 2019. https://www.nice.org.uk/guidance/ng120/chapter/Recommendations (accessed October 7, 2026)
NICE. Suspected cancer: recognition and referral (NG12). Last updated April 15, 2026. https://www.nice.org.uk/guidance/ng12/chapter/Recommendations-organised-by-site-of-cancer (accessed October 7, 2026)
Morice AH et al. ERS guidelines on the diagnosis and treatment of chronic cough in adults and children. Eur Respir J 2020;55(1):1901136. https://doi.org/10.1183/13993003.01136-2019 (accessed October 7, 2026)
Irwin RS et al. Diagnosis and management of cough executive summary: ACCP evidence-based clinical practice guidelines. Chest 2006;129(1 Suppl):1S–23S. https://doi.org/10.1378/chest.129.1_suppl.1S (accessed October 7, 2026)
Oduwole O et al. Honey for acute cough in children. Cochrane Database Syst Rev 2018. https://doi.org/10.1002/14651858.CD007094.pub5 (accessed October 7, 2026)
Singh M et al. Heated, humidified air for the common cold. Cochrane Database Syst Rev 2017. https://doi.org/10.1002/14651858.CD001728.pub6 (accessed October 7, 2026)
European Medicines Agency. Codeine not to be used in children below 12 years for cough and cold. 2015. https://www.ema.europa.eu/en/news/codeine-not-be-used-children-below-12-years-cough-cold (accessed October 7, 2026)
CDC. Whooping Cough (Pertussis): Symptoms. 2025. https://www.cdc.gov/pertussis/signs-symptoms/index.html (accessed October 7, 2026)
T.C. Sağlık Bakanlığı, HSGM. Mevsimsel Grip: Tedavisi Nedir? 2024. https://grip.saglik.gov.tr/tr/tedavi.html (accessed October 7, 2026)
T.C. Sağlık Bakanlığı. ALO 171 Sigara Bırakma Danışma Hattı. 2026. https://alo171.saglik.gov.tr/ (accessed October 7, 2026)

Frequently asked questions

How do you stop a cough that won't go away?

Rather than suppressing the cough, its cause needs to be found. A cough due to asthma, reflux or a medicine eases once the cause is treated. In the first weeks, honey and fluids can ease the symptoms.

How many days does it take for a cough to go away?

According to NICE, most coughs clear up within 3–4 weeks. A cough after flu can also last for weeks. See a physician for a cough that lasts longer than this.

What causes a dry cough that won't go away?

Post-infectious sensitivity, asthma, reflux and some blood pressure medicines are among the most common causes. Details are in our dry cough guide.

Is a persistent cough a sign of cancer?

Usually not. Still, NICE recommends a chest X-ray at age 40 and over if an unexplained cough is accompanied by other symptoms. The threshold is lower for people who have ever smoked.

Does honey really help a cough?

According to a Cochrane review, honey probably relieves cough in children. It must never be given to babies under 1 year old. It does not, however, treat the cause of a long-lasting cough.

Source: NICE. Cough (acute): antimicrobial prescribing (NG120). 2019.

Symptom Guides

How Do You Get Rid of a Persistent Cough? Causes and Warning Signs

A cough usually clears up on its own within 3–4 weeks. For a cough lasting more than 8 weeks, the cause is investigated; coughing up blood or shortness of breath should not be left to wait.

6 October 2026 · 6 min read · DoktorClub Editorial Board

Translated from the Turkish original by DoktorClub. The Turkish version is the reference text; this English translation has not been separately reviewed by a physician. Read the Turkish original.

Key takeaway

Short Answer

How long must a cough last to count as "persistent"?

Physicians divide cough into three groups by duration. This distinction determines the likely cause and when tests are needed.

Duration	Name	Most common cause
Less than 3 weeks	Acute cough	Common cold, flu, acute bronchitis
3–8 weeks	Prolonged (subacute) cough	Post-infectious cough, whooping cough
More than 8 weeks	Chronic cough	Asthma, reflux, nose and sinus problems, smoking, medicines

This classification is based on the 2006 guideline of the American College of Chest Physicians (ACCP). In children, the ERS considers a cough lasting more than 4 weeks to be chronic.

What causes it?

Post-infectious cough: Even after a cold has passed, the airways remain sensitive for a while. The cough can last for weeks and gradually fades.

Asthma: According to the ERS, asthma-related cough is a common type of chronic cough. Sometimes it shows up only as a dry cough, without wheezing.

Reflux: Stomach contents backing up into the esophagus can trigger coughing. Details are in our guide to reflux and cough.

Postnasal drip (upper airway cough syndrome): Nose and sinus diseases can also accompany a cough. The ERS notes that how this condition leads to cough is still debated.

Smoking: According to the ERS, smoking is the most important correctable cause of chronic cough. Smoking is also closely linked to COPD (chronic obstructive pulmonary disease).

More serious causes: Tuberculosis, pneumonia and lung cancer can also cause a long-lasting cough. In tuberculosis, the cough may be accompanied by fever, night sweats and weight loss.

What helps at home?

NICE recommends the following steps for a cough in the first 3–4 weeks:

Wait and watch: Most coughs go away on their own. Note whether it is getting worse.
Try honey: Use only in people older than 1 year. You can add it to warm water or herbal tea.
Drink plenty of fluids: This reduces throat dryness.
Rest: If you have a fever, stay at home.
Avoid smoke: If you smoke, get support to quit. Make sure no one smokes at home.
For fever and pain: Paracetamol or ibuprofen can be used. Do not exceed the dose on the package leaflet.

If you are pregnant or have kidney disease, liver disease or a stomach ulcer, ask your physician or pharmacist before taking a painkiller. If you take a blood thinner, consult them first as well.

In children

Do not give honey to a baby under 1 year old. At this age honey carries a risk of infant botulism (a serious poisoning that affects the nervous system).
NICE considers over-the-counter cough syrups for ages 12 and over. Ask a physician before giving syrup to a younger child.
According to the European Medicines Agency (EMA), cough medicines containing codeine should not be used under the age of 12.
According to the ERS, in a healthy young child with a sudden-onset cough, an inhaled foreign object should be considered. If you suspect this, be sure to tell the physician.
According to the CDC, coughing fits in whooping cough can last up to 10 weeks. In babies, pauses in breathing can occur without coughing.

For more, see our child health guides.

How is it diagnosed?

The physician first takes your history and examines you. You will be asked about how long the cough has lasted, the color of any phlegm, smoking and the medicines you take.

Chest X-ray: According to NICE, an urgent chest X-ray is ordered at age 40 and over if there are two unexplained symptoms. These symptoms are cough, fatigue, shortness of breath, chest pain, weight loss and loss of appetite.
In people who have ever smoked: Even a single symptom from the same list is enough for a chest X-ray.
Coughing up blood: According to NICE, unexplained coughing up of blood at age 40 and over leads to urgent referral for suspected cancer.
Breathing test (spirometry): Ordered when asthma or COPD is suspected.
CT scan: The ERS does not recommend routine CT scanning in chronic cough when the chest X-ray and examination are normal.

What not to do

Do not start antibiotics on your own: According to NICE, antibiotics are not recommended for a cold causing a cough. In acute bronchitis, too, antibiotics shorten the cough by only about half a day on average.
Do not give codeine syrup to a child: According to the EMA, there is a risk of respiratory depression under the age of 12.
Do not stop your blood pressure medicine on your own: If you think the cough is caused by the medicine, talk to your physician. If necessary, your physician will switch you to another medicine.
Do not use reflux medicine on your own for a long time: According to the ERS, stomach acid medicines may benefit cough only in people who have reflux symptoms.
Do not do steam inhalation with boiling water: A tipped-over container of boiling water can cause burns, especially in children. The benefit of heated humidified air in the common cold has also not been proven.
Do not spend weeks relying on syrups: See a physician for a cough lasting more than 3–4 weeks.

What does the evidence say?

Honey: A 2018 Cochrane systematic review found that in children, honey probably relieves cough more than no treatment and placebo. Most of the studies involved a single night of treatment.

Steam: A 2017 Cochrane review could not show either benefit or harm from heated humidified air in the common cold.

Mucus thinners and inhalers: NICE does not recommend mucolytics or bronchodilators for acute cough unless there is an underlying condition such as asthma.

In Türkiye

Antibiotics: According to the Turkish Ministry of Health, antibiotics are of no benefit in flu and the common cold. The Ministry also stresses that medicines should not be used except on a physician's advice.
Support to quit smoking: The Ministry of Health's ALO 171 Smoking Cessation Helpline provides support during the quitting process. The helpline's website also lists smoking cessation clinics.
Appointments: You can go directly to your family physician or book an appointment through MHRS (Türkiye's central hospital appointment system). You can access your previous X-rays through e-Nabız (Türkiye's national health record app).
Suspected poisoning: If a child has accidentally drunk cough syrup or another medicine, call 114, the National Poison Information Center. If there is drowsiness, slowed breathing or vomiting, call 112.

Which doctor should I see?

First step: Your family physician. Most coughs are evaluated here and referred if necessary.
Chronic cough or coughing up blood: Pulmonology (chest diseases).
Postnasal drip and sinus problems: Ear, Nose and Throat (ENT).
Reflux symptoms: Internal Medicine or Gastroenterology.
Children: Pediatrics; if necessary, Pediatric Pulmonology.
Bring with you: A list of all the medicines you take, your smoking history, any previous chest X-rays and the date the cough started.

When should I seek emergency care?

If you are coughing up a mouthful of blood, call 112.
If you have sudden shortness of breath, turn blue, or are too breathless to speak, call 112.
If you have sudden, severe chest pain, or chest pain together with shortness of breath, call 112.
If a child cannot breathe after a sudden coughing fit, or you suspect an inhaled foreign object, call 112.
If a baby turns blue or stops breathing after a coughing fit, call 112.
If a child has swallowed cough syrup or a medicine, call 114; if there is drowsiness or slowed breathing, call 112.
If you have a small amount of blood-streaked phlegm, chest pain that worsens with coughing, high fever, rapid worsening or chest retractions, see a physician the same day.
Make an appointment if you have unexplained weight loss, night sweats or a cough lasting more than 3–4 weeks.

Related guides

What changed? (October 2026)

New guide: cough durations, home care and warning signs brought together on a single page.
The NICE NG120 acute cough guideline, the ERS 2020 chronic cough guideline and NICE NG12, updated in April 2026, were followed.

Sources

NICE. Cough (acute): antimicrobial prescribing (NG120). 2019. https://www.nice.org.uk/guidance/ng120/chapter/Recommendations (accessed October 7, 2026)
NICE. Suspected cancer: recognition and referral (NG12). Last updated April 15, 2026. https://www.nice.org.uk/guidance/ng12/chapter/Recommendations-organised-by-site-of-cancer (accessed October 7, 2026)
Morice AH et al. ERS guidelines on the diagnosis and treatment of chronic cough in adults and children. Eur Respir J 2020;55(1):1901136. https://doi.org/10.1183/13993003.01136-2019 (accessed October 7, 2026)
Irwin RS et al. Diagnosis and management of cough executive summary: ACCP evidence-based clinical practice guidelines. Chest 2006;129(1 Suppl):1S–23S. https://doi.org/10.1378/chest.129.1_suppl.1S (accessed October 7, 2026)
Oduwole O et al. Honey for acute cough in children. Cochrane Database Syst Rev 2018. https://doi.org/10.1002/14651858.CD007094.pub5 (accessed October 7, 2026)
Singh M et al. Heated, humidified air for the common cold. Cochrane Database Syst Rev 2017. https://doi.org/10.1002/14651858.CD001728.pub6 (accessed October 7, 2026)
European Medicines Agency. Codeine not to be used in children below 12 years for cough and cold. 2015. https://www.ema.europa.eu/en/news/codeine-not-be-used-children-below-12-years-cough-cold (accessed October 7, 2026)
CDC. Whooping Cough (Pertussis): Symptoms. 2025. https://www.cdc.gov/pertussis/signs-symptoms/index.html (accessed October 7, 2026)
T.C. Sağlık Bakanlığı, HSGM. Mevsimsel Grip: Tedavisi Nedir? 2024. https://grip.saglik.gov.tr/tr/tedavi.html (accessed October 7, 2026)
T.C. Sağlık Bakanlığı. ALO 171 Sigara Bırakma Danışma Hattı. 2026. https://alo171.saglik.gov.tr/ (accessed October 7, 2026)

Frequently asked questions

How do you stop a cough that won't go away?

How many days does it take for a cough to go away?

According to NICE, most coughs clear up within 3–4 weeks. A cough after flu can also last for weeks. See a physician for a cough that lasts longer than this.

What causes a dry cough that won't go away?

Post-infectious sensitivity, asthma, reflux and some blood pressure medicines are among the most common causes. Details are in our dry cough guide.

Is a persistent cough a sign of cancer?

Usually not. Still, NICE recommends a chest X-ray at age 40 and over if an unexplained cough is accompanied by other symptoms. The threshold is lower for people who have ever smoked.

Does honey really help a cough?

According to a Cochrane review, honey probably relieves cough in children. It must never be given to babies under 1 year old. It does not, however, treat the cause of a long-lasting cough.

Source: NICE. Cough (acute): antimicrobial prescribing (NG120). 2019.

How Do You Get Rid of a Persistent Cough? Causes and Warning Signs

Key takeaway

Short Answer

How long must a cough last to count as "persistent"?

What causes it?

What helps at home?

In children

How is it diagnosed?

What not to do

What does the evidence say?

In Türkiye

Which doctor should I see?

When should I seek emergency care?

Related guides

What changed? (October 2026)

Sources

Frequently asked questions

More health news

Monkeypox (Mpox) Symptoms: Rash, Transmission and Vaccine

What Are the Symptoms of Flu, and How Does It Go Away? An Influenza Guide

How Do Nausea and Vomiting Go Away? What Helps at Home?

What Helps Headaches and Migraine at Home?

How Do You Get Rid of a Persistent Cough? Causes and Warning Signs

Key takeaway

Short Answer

How long must a cough last to count as "persistent"?

What causes it?

What helps at home?

In children

How is it diagnosed?

What not to do

What does the evidence say?

In Türkiye

Which doctor should I see?

When should I seek emergency care?

Related guides

What changed? (October 2026)

Sources

Frequently asked questions

More health news

Monkeypox (Mpox) Symptoms: Rash, Transmission and Vaccine

What Are the Symptoms of Flu, and How Does It Go Away? An Influenza Guide

How Do Nausea and Vomiting Go Away? What Helps at Home?

What Helps Headaches and Migraine at Home?