Wet cough vs dry cough
A wet cough brings up mucus or makes a rattling sound because there is mucus in the airways. A dry cough produces no mucus and often feels tickly or scratchy; see dry cough at night.
Many coughs change over the course of an illness, starting dry and becoming wet, or the other way round. The colour of the mucus gives limited information; see phlegm color.
Common causes in adults
- Colds and flu: the most common cause; the cough can last 2 to 3 weeks.
- Acute bronchitis: inflammation of the large airways after a viral infection.
- Chest infection and pneumonia: with fever, breathlessness and feeling unwell.
- Postnasal drip: mucus from the nose and sinuses; see postnasal drip.
- Smoking: a chronic morning cough with phlegm.
- COPD and bronchiectasis: a daily productive cough for months.
- Asthma: cough with wheeze and breathlessness, sometimes with mucus.
- Reflux: can cause throat mucus and cough.
Wet cough in children
Children often have a wet cough with colds, and it can last up to 3 or 4 weeks. A wet cough that lasts more than 4 weeks may be protracted bacterial bronchitis, a bacterial infection of the airways that responds well to a course of antibiotics, so it should be checked by a doctor.
Other causes include asthma, inhaled objects and, rarely, conditions such as cystic fibrosis. A child who is breathing fast, drawing in the ribs, has blue lips or is very drowsy needs emergency help.
Home remedies for a wet cough
- Drink plenty of fluids to keep mucus thin.
- Hot drinks with honey and lemon (not for babies under 1 year).
- Breathe in steam from a hot shower.
- Saline nasal sprays or rinses if mucus comes from the nose.
- Rest and raise your head at night.
- Avoid smoke and stop smoking.
See also how to get rid of phlegm and sore throat and cough.
Cough medicines: what to know
There is little evidence that over-the-counter cough medicines shorten a cough. Expectorants are marketed to loosen mucus, while suppressants reduce the urge to cough; suppressants are not usually recommended for a wet cough because coughing helps clear the airways.
Many cough and cold medicines are not suitable for young children. Ask a pharmacist before using them, and check for interactions with other medicines.
How long a wet cough lasts
- After a cold: usually 1 to 3 weeks.
- Acute bronchitis: often 2 to 3 weeks, sometimes longer.
- After a chest infection: the cough can linger for several weeks as the airways heal.
- Chronic causes: months, needing assessment and treatment of the cause.
How a doctor assesses a persistent wet cough
A doctor asks about how long the cough has lasted, smoking, other symptoms and medicines, and listens to the chest. Depending on the findings, a chest X-ray, sputum test, breathing tests or a referral to a respiratory or ENT specialist may follow.
An ENT assessment is useful when the cough seems to come from the nose, sinuses or throat, for example with constant postnasal drip or throat clearing.
Wet cough and smoking
A wet cough every morning is common in smokers and is a sign that the airways are irritated. It often improves within weeks to months after stopping smoking, although the cough can briefly increase at first as the airways start clearing mucus again. A long-standing cough that changes in smokers should always be checked.
When to see a doctor
- A cough lasting more than 3 weeks in adults or 4 weeks in children.
- Breathlessness, wheezing or chest pain.
- High fever or feeling very unwell.
- Coughing up blood.
- Weight loss or night sweats.
- A baby or child with fast breathing, struggling to breathe or blue lips: call emergency services.
Key points to remember
- Most wet coughs follow a viral infection and clear within 3 weeks.
- Fluids, honey, steam and rest help; suppressants are not usually advised.
- A wet cough over 4 weeks in a child needs a doctor.
- Breathlessness, blood or a cough over 3 weeks needs assessment.
Questions about wet cough
These answers are general information and do not replace an examination or individual medical advice.
Is a wet cough good or bad?
Coughing up mucus helps clear the airways. It is usually part of recovery but should be checked if it lasts or comes with other symptoms.
How do I get rid of a wet cough fast?
Drink fluids, use steam, have honey in hot drinks and rest. Most wet coughs need time to clear.
Should I take a cough suppressant for a wet cough?
Not usually, because coughing helps clear mucus. Ask a pharmacist.
When is a wet cough serious in a child?
If it lasts more than 4 weeks, or the child has difficulty breathing, high fever or seems very unwell.
Can allergies cause a wet cough?
Yes, through postnasal drip; see can allergies make you cough.
Does a wet cough mean pneumonia?
Not usually. Pneumonia causes fever, breathlessness, chest pain and feeling very unwell.
Sources
This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.