If the color of the mucus changes to green or yellow, it may be a sign that a bacterial infection has also set in. The cough is usually the last symptom to clear up and may last for weeks.
After 2 or 3 days, mucus may change to a white, yellow, or green color. This is normal and does not mean you need an antibiotic. Some symptoms, especially runny or stuffy nose and cough, can last for up to 10 to 14 days.
Call your doctor if your cough (or your child's cough) doesn't go away after a few weeks or if it also involves any one of these: Coughing up thick, greenish-yellow phlegm.
Yellow phlegm is a sign that your body is fighting off a mild infection. "White blood cells are responsible for fighting infections, and as they get picked up in the mucus, they can cause it to have a yellowish hue," says Dr. Kreel.
A cough is a reflex action to clear your airways of mucus and irritants such as dust or smoke. It's rarely a sign of anything serious. Most coughs clear up within 3 weeks and don't require any treatment.
Antibiotics aren't recommended for many chest infections, because they only work if the infection is caused by bacteria, rather than a virus. Your GP will usually only prescribe antibiotics if they think you have pneumonia, or you're at risk of complications such as fluid building up around the lungs (pleurisy).
Both viral and bacterial upper respiratory infections can cause similar changes to the type and coloration of nasal mucus. During a common cold, nasal mucus may start out watery and clear, then become progressively thicker and more opaque, taking on a yellow or green tinge.
Days 3 to 5: Cough and More Nasal Congestion
You may notice that mucus from your runny nose has become thicker, with a yellow or green tinge. This usually is due to a spike in the number of white blood cells your immune system has dispatched to overcome the virus, according to the Mayo Clinic.
Bronchitis is an infection of the main airways of the lungs (bronchi), causing them to become irritated and inflamed. The main symptom is a cough, which may bring up yellow-grey mucus (phlegm). Bronchitis may also cause a sore throat and wheezing. Read more about the symptoms of bronchitis.
You might have heard that yellow or green mucus is a clear sign that you have an infection, but despite that common misperception, the yellow or green hue isn't due to bacteria. When you have a cold, your immune system sends white blood cells called neutrophils rushing to the area.
A bronchitis cough sounds like a rattle with a wheezing or whistling sound. As your condition progresses, you will first have a dry cough that can then progress towards coughing up white mucus.
Yellow mucus is a sign that whatever virus or infection you have is taking hold. The good news? Your body is fighting back. The yellow color comes from the cells — white blood cells, for example — rushing to kill the offending germs.
If you see green or yellow phlegm, it's usually a sign that your body is fighting an infection. The color comes from white blood cells. At first, you may notice yellow phlegm that then progresses into green phlegm. The change occurs with the severity and length of the potential sickness.
Clear or white mucus often indicates a viral infection, while yellow or green mucus may suggest a bacterial infection. The biggest difference between viral and bacterial bronchitis is treatment, as antibiotics used to treat bacterial infections don't kill viruses.
FALSE: If you have green or yellow mucus, it's a bacterial infection and you need antibiotics. Colds, sore throats, upper respiratory infections and influenza (the flu) are caused by viruses, which could cause colored mucus. Antibiotics won't kill, prevent or stop spreading viruses.
So, to answer your questions: The phlegm itself isn't toxic or harmful to swallow. Once swallowed, it's digested and absorbed. It isn't recycled intact; your body makes more in the lungs, nose and sinuses. It doesn't prolong your illness or lead to infection or complications in other parts of your body.
“Coughing is good,” Dr. Boucher says. “When you cough up mucus when you are sick, you are essentially clearing the bad guys—viruses or bacteria—from your body.”
Yellow mucus means your illness is progressing normally. White blood cells and other cells from the immune system have come to fight the germs making you sick. Some of them are now exhausted and being washed away by mucus. The texture of yellow mucus is likely drier and thicker than it used to be as well.
The main symptoms of a chest infection can include: a persistent cough. coughing up yellow or green phlegm (thick mucus), or coughing up blood. breathlessness or rapid and shallow breathing.
These symptoms can be unpleasant, but they usually get better on their own in about 7 to 10 days. The cough and mucus can last up to 3 weeks.
Warning signs
"With a viral cough, you often have a fever which tends to go up and down," explains Coffey. "With a bacterial infection, such as pneumonia, you tend to have a consistently high fever - usually around 38-40°C." If your fever remains persistently high, it's worth giving your GP a call.
Your doctor may prescribe antibiotics if the symptoms are severe and include high fever along with nasal drainage and a productive cough. Antibiotics may also be necessary if you feel better after a few days and then your symptoms return or if the infection lasts more than a week.
Bronchitis can also, however, bring on chest discomfort and wheezing. While symptoms for either bronchitis or pneumonia can range from mild to serious enough to require hospitalization, symptoms such as fever, breathing problems, and chest pain tend to be more severe with pneumonia.