Clear. “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.
Changes in mucus color, from clear to white to yellow to green, are part of the normal course of an illness. It's a sign that your immune system is fighting to get better. Pink, red, orange, or brown snot, on the other hand, is typically not from an illness.
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.
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.
White snot means your mucus has a low water content, which means it will be flowing slower than healthy mucus. White mucus indicates you have some sort of infection brewing. Most commonly, white snot indicates you're coming down with the common cold, which may cause symptoms such as: Sore throat.
An infection can make mucus thicker and stickier. 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.
This is the peak stage of a cold. It usually occurs within 2–3 days of experiencing the first cold symptoms. People may also notice mucus from the nose turning white, green, or yellow during this stage.
One of the first signs of a cold is green or yellow mucus. It's no reason for concern, and in fact, it means your body is working extra hard to fight off infection. 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.
Signs and symptoms of a chest infection
coughing up yellow or green phlegm (thick mucus), or coughing up blood.
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. Those symptoms should improve over time.
Cold and flu symptoms such as a blocked nose or cough usually subside after 7-10 days and the absence of these things is quite an obvious indication that you are on the mend.
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.
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. As you get better over the next few days, the discharge tends to clear up.
Even if you're coughing up yellow or green phlegm, you might not need antibiotics. Your mucus color alone can't tell you if a virus or bacteria is causing your cough. If your cough lasts longer than 3 weeks, it's time to see a healthcare provider. You may need an X-ray or antibiotics.
Green and cloudy: viral or bacterial infection
A lot of the symptoms of viral infections – fever, cough, headache, loss of smell – overlap for COVID-19 and other viral infections like the flu, respiratory syncytial virus and the common cold.
Common symptoms of pneumonia include: a cough – which may be dry, or produce thick yellow, green, brown or blood-stained mucus (phlegm)
If you have a bacterial chest infection, you should start to feel better 24 to 48 hours after starting on antibiotics. You may have a cough for days or weeks. For other types of chest infections, the recovery is more gradual. You may feel weak for some time and need a longer period of bed rest.
Small amounts of white mucus may be coughed up if the bronchitis is viral. 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.
Day 4: Mucus may turn yellow or green (this is normal). Sore throat improves, but coughing begins. Days 5-7: Energy and congestion improve. 1 week+: Cough usually tapers off after a week, but can take up to 3-6 weeks to fully resolve.
Types of cough
A dry cough is one of the most common coronavirus symptoms, but some people may have a cough with phlegm (thick mucus).
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.
You can spread the common cold from a few days before your symptoms appear until all of the symptoms are gone. Most people will be contagious for up to 2 weeks. Symptoms are usually worse during the first 2 to 3 days, and this is when you're most likely to spread the virus.