Clear snot is in the normal range, while white mucus can mean you're congested and yellow or green mucus can sometimes mean that you have an infection.
What's key to remember is that yellow, green, or brown mucus all can signal bacterial or viral infections. Red. A red or pinkish tinge might mean a little harmless blood from, say, blowing your nose often or something riling up your nasal lining.
People who have white, yellow, or green mucus that is present for more than a few days, or if they experience other symptoms, such as fever, chills, a cough, or sinus pain, should speak with a doctor.
Green or Yellow Mucus
White blood cells rush to battle infection, and when they've done their job, they get flushed out of the body along with the virus. The yellow color comes from dead white blood cells, which can turn green if there are a lot of white blood cells and other debris.
But "you can have perfectly clear mucus and have a terrible ear and sinus infection," Kao says. If you do have an infection, you'll likely also have other symptoms, such as congestion, fever, and pressure in your face, overlying the sinuses, Johns says.
When viruses that cause colds first infect the nose and sinuses, the nose makes clear mucus. This helps wash the viruses from the nose and sinuses. 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.
What does clear snot mean? Clear snot is considered “normal” or healthy. Your body produces around 1.5 liters of this discharge each day, though you likely swallow most of it. This type of mucus is made up of water with proteins, antibodies, and salts.
Thick, colored nasal mucus more often occurs at the beginning of a bacterial illness, rather than several days into it, as occurs with a viral infection. In addition, symptoms due to a bacterial infection often last more than 10 days without improvement.
Green and cloudy: viral or bacterial infection
Cloudy, discolored drainage – like green or yellow – usually means a viral or bacterial infection.
It's a prevailing myth that anyone with green phlegm or snot needs a course of antibiotics to get better. Most of the infections that generate lots of phlegm and snot are viral illnesses and will get better on their own although you can expect to feel pretty poorly for a few weeks.
However, if you have other respiratory illnesses such as bronchitis or pneumonia with COVID-19, you may have a wet cough that contains mucus. Does coughing up mucus mean you're getting better? In most cases, coughing up mucus means your body is working to fight off an infection, and it is in the healing stages.
After 2 or 3 days of symptoms, the mucus discharged from your nose may change to a white, yellow, or green color. This is normal and does not mean you need an antibiotic. 10 days and beyond: Lingering symptoms can last up to 2 weeks in some people, especially runny nose, stuffy nose, and coughing.
What causes excessive mucus? Smoking or exposure to an irritant in the air may cause you to produce more mucus than usual. If the mucus is clear, you might have allergies. Other conditions that could cause excess mucus include bronchitis, chronic obstructive pulmonary disease, and cystic fibrosis.
Green or yellow “sputum,” as clinicians call it, more often than not reflects a bacterial infection, whereas clear, white or rust colored phlegm most likely does not, according to the new study. The results could help doctors determine whether or not a patient would benefit from antibiotics.
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.
A runny nose with green mucus -- what doctors call "purulent rhinitis" -- is the most common reason for getting a prescription for antibiotics.
Research has found that doctors are more likely to prescribe antibiotics to patients with green or yellow nasal discharge.
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.
We found a bacterial infection significantly more often in yellowish or greenish sputum samples (Pearson's χ2(1) = 6.32, p = 0.012). The sensitivity of and yellowish or greenish sputum used as a test for a bacterial infection was 0.79 (95% CI 0.63–0.94); the specificity was 0.46 (95% CI 0.038–0.53).
Green mucus is a sign that the body is fighting a difficult infection. If you are still sick after a couple of weeks, this can be a sign of a bacterial infection. In these cases, it's a good idea to contact a healthcare provider.
Thin and clear mucus is normal and healthy. White. Thicker white mucus goes along with feelings of congestion and may be a sign that an infection is starting. The white color comes from an increased number of white blood cells.
When you do cough up phlegm (another word for mucus) from your chest, Dr. Boucher says it really doesn't matter if you spit it out or swallow it.
Infections also lead to inflammation in the mucous membranes that line the nose and the rest of your airway. This can cause certain airway glands to make more mucus. That mucus can get thick with bacteria and cells that arrive to fight the infection. That can stimulate even more mucus production.
“Normally, mucus is clear. When you have a cold or infection, it might turn green or yellow,” said Alyssa. Clear snot usually signals allergies or some kind of environmental factor that is triggering your nose to start running, such as inhaling dust or allergens. Clear snot is nothing to worry about.