Cough with phlegm (plema) or a cough that won't go away: causes, care and when to get checked

Phlegm (plema, or sputum) is mucus from your lungs and lower airways. Coughing it out is how your body cleans your chest. A cough that brings it up is a wet or productive cough. It is not necessarily a sign of serious illness, but sometimes it is a sign of a problem such as pneumonia or heart failure.

Its look gives clues, not the cause:

• Clear or white: the usual colour of phlegm.
• Yellow or green: common in chest infections after a cold or flu, and many get better by themselves. See a doctor if it is not improving, or if you have a high fever, feel very unwell or are short of breath.
• A lot of phlegm most days for months, with frequent chest infections, can be a sign of a long-term airway problem (see why a cough won't go away).
• Streaks of blood: get checked today. More than a few streaks is an emergency.

Phlegm that seems stuck in the throat is often mucus dripping down from the back of the nose, after a cold or with allergies or sinus problems. Our common cold guide explains a salt water nose rinse.

• Short-term cough: most clear within 3 to 4 weeks. After a chest infection, the other symptoms usually ease in 7 to 10 days, but the cough and phlegm can last up to 3 weeks.
• More than 3 weeks: UK health advice is to see a doctor.
• More than 8 weeks: this is called a chronic or persistent cough, and its cause needs to be looked for.

In the Philippines, don't wait that long. The DOH TB programme says anyone 15 or older with a cough of 2 weeks or more should be checked for TB. For a child with a cough, see the children's section of our cough remedy guide and ask a doctor.

A cough that won't go away has many possible causes, and many of them can be treated:

• After a virus. The airways can stay sensitive for weeks after a cold, flu or chest infection.
• Mucus from the nose or sinuses dripping down the throat (postnasal drip), from allergies or sinusitis.
• Asthma (hika). Often worse at night or with exercise, with wheezing or chest tightness.
• Acid reflux. Stomach acid coming up can irritate the throat and airways. See our acid reflux guide.
• Smoking. A "smoker's cough" with phlegm that does not go away can be a sign of COPD (chronic bronchitis or emphysema), which slowly makes breathing harder. Second-hand smoke and smoke from cooking with wood, charcoal (uling) or kerosene indoors also raise the risk of COPD.
• Tuberculosis (TB). Common in the Philippines. It can cause a cough for weeks, sometimes with blood, fever, night sweats and weight loss.
• Whooping cough (pertussis), with bouts of coughing that go on for weeks.
• Bronchiectasis. Damaged, widened airways that make a lot of phlegm and get infected often. It can follow a severe infection such as pneumonia, TB, measles or whooping cough.
• Some medicines, such as ACE inhibitors for blood pressure, can cause a cough that won't go away. Don't stop them yourself: ask your doctor, who may switch you to another medicine.
• Heart failure, when the heart can't pump well (see our heart failure guide), or dust and fumes at work, such as silica dust.

Rarely, a long cough is a sign of lung cancer, one more reason to get checked.

The Philippines carries a heavy TB burden. WHO and the DOH estimate that in 2024 TB affected about 625 in every 100,000 people in the country and took about 98 Filipino lives a day. TB can be cured, and the tests and medicines are free at public health facilities.

The DOH TB programme says to get checked if you are 15 or older and have coughed for 2 weeks or more, with or without other symptoms. It also says to check an unexplained cough of any length if you live closely with someone who has TB, have diabetes, HIV or kidney failure, are an older adult, or live in a crowded setting such as a jail or dormitory.

The test uses phlegm coughed up from deep in your chest, not saliva. See our TB symptoms guide.

• Drink plenty of water, soup and warm drinks. Fluids loosen the mucus so it is easier to cough up. With heart or kidney disease, ask your doctor how much to drink.
• Warm water with honey and calamansi may soothe the throat, though the evidence is limited. Never give honey to a baby under 1.
• Sleep with your head raised on extra pillows to breathe easier and help clear your chest.
• Spit phlegm into a tissue, throw it away and wash your hands. Spitting on the ground can spread TB and other germs.
• Steam, for example in a warm shower, may help. If you do tuob (steam from a bowl), take care not to scald yourself. Never let children do tuob, because they can be burned.
• Rest, and avoid hard exercise until you feel better.
• Avoid smoke: don't smoke or vape, keep away from other people's smoke, and open windows when cooking.

If you have asthma or COPD, keep using the inhalers your doctor prescribed.

Unsure if you need a doctor? Ask our free AI symptoms guide.

These may ease symptoms, but none cure the cause, and the evidence that they help is limited.

• Expectorants such as guaifenesin are meant to loosen phlegm. UK guidance lists them as an option for a short-term cough.
• Mucolytics such as carbocisteine and ambroxol are meant to thin the mucus. UK guidance advises against mucolytics for a short-term cough from a cold or acute bronchitis.
• Cough suppressants such as dextromethorphan quiet the urge to cough. They are not for a cough that brings up a lot of phlegm, which needs to come out.
• Lagundi is a Philippine herbal cough medicine; see our cough remedy guide.

Follow the label or your pharmacist for how much to take. For children, in pregnancy or while breastfeeding, and for older adults on other medicines, ask a doctor first. Our medicines guide can explain a product.

Antibiotics work only against bacteria, and most coughs come from viruses. In acute bronchitis, UK guidance notes that they cut the cough short by only about half a day on average, and they can cause side effects, particularly diarrhoea and nausea. Take them only when a doctor prescribes them, and never use leftover ones.

• "Green plema means I need an antibiotic." Not by itself. Green or yellow phlegm is common in chest infections that get better on their own. A doctor decides after checking you.
• "It's just a smoker's cough." A cough that won't go away is a warning sign. It needs a TB check after 2 weeks, and if you are over 35 and smoke or used to smoke, a check for COPD.
• "A long cough is just mahina ang baga." A long cough has a cause a doctor can look for, such as TB, asthma, reflux or COPD, and many of these can be treated.

• Barangay health station, RHU or city health center. Say how long you have had the cough. They can test your phlegm for TB or refer you to a TB-DOTS center. Find one near you, or read how the health system works.
• Free TB care. Public facilities give phlegm tests, including rapid molecular tests such as Xpert, and TB medicines for free. The DOH also brings portable, AI-assisted chest X-rays to communities.
• PhilHealth YAKAP. As of July 2025, once you register with a YAKAP clinic, its doctor sees you for free, can order the lab tests you need, and can prescribe covered medicines that you get from accredited pharmacies, up to ₱20,000 worth a year. Private YAKAP clinics may ask for up to ₱900 per person for the whole year. See our PhilHealth YAKAP guide.

The doctor may test your phlegm or order a chest X-ray or a breathing test (spirometry). Bring a list of your medicines and note when the cough began and any blood. You can also book a call with a nurse.

• Stop smoking and vaping, the most important step against COPD, even after many years of smoking. Ask your health center for help.
• Cleaner air: cook with LPG or electricity if you can, and air out the kitchen.
• Vaccines: ask about the yearly flu vaccine and the pneumococcal vaccine if you are over 65 or have a long-term illness.
• Cover your cough, wash your hands, and wear a mask around others if you have a long cough.

More guides: lungs and breathing.