Mucus

Where does mucus come from? The mucus is a normal, slippery, and stringy fluid substance produced by many lining tissues in the body. It is essential for body function and acts as a protective and moisturizing layer to keep critical organs from drying out. Mucus also acts as a trap for irritants like dust, smoke, or bacteria. It contains antibodies and bacteria-killing enzymes to help fight off infections.

The body produces a lot of mucus -- about 1 to 1.5 liters per day. We don't tend to notice mucus at all unless its production is increased or the quality of mucus has changed, as may happen with different illnesses and conditions.

Mucus is produced in many sites in the body by mucus glands in the lining tissues of multiple organs, including the following:

• Lungs: Mucus in the lungs is also known as sputum or phlegm.
• Sinuses: Mucus formed in the sinus drains out through the nasal passages.
• Mouth: Mucus in the mouth acts as a lubricant and serves as a line of defense.
• Throat: Mucus in the throat is also known as phlegm or sputum.
• Nose: Excess mucus in the nose can lead to a runny nose, also known as nasal discharge.
• Gastrointestinal tract: Mucus keeps the gastrointestinal tract moist and acts as a barrier against infiltration of microorganisms, digestive enzymes and acids, digested food particles, microbial by-products, and food-associated toxins.

Excess mucus in the nose can drip back into the throat. This results in an accumulation of mucus in the throat, a condition known as postnasal drip.

Phlegm is the term that is used to refer to mucus produced by the respiratory system, particularly when excess mucus is produced and coughed up. During an infection, the mucus contains the viruses or bacteria responsible for the infection as well as infection-fighting cells of the body's immune system (white blood cells).

Phlegm itself is not dangerous, but when present in large amounts, it can clog the airways. Phlegm is usually expelled by coughing, and this is typically accompanied by symptoms like nasal congestion, runny nose, and sore throat or fever.

Respiratory infections like colds, the flu, and sinusitis are common causes of increased mucus production and coughing up mucus. Allergic reactions are another reason that mucus production can increase. Even the consumption of spicy foods can spark excess mucus production in the nasal passages in some individuals

When you are sick from a respiratory infection, you may notice thickened mucus that may appear darker than normal. This thickened mucus is harder to clear than typical mucus. This mucus is associated with many of the characteristic symptoms of a cold or flu. The mucus may also appear yellow-green when you are ill.

Excessive mucus is rarely a serious medical problem, but it is uncomfortable and a nuisance, particularly when it blocks sinuses or causes coughing fits.

Thickened mucus and excess mucus production cause many unpleasant symptoms, such as:

• Runny nose
• Nasal congestion
• Sore throat
• Sinus headache
• Cough

Different colors of mucus and phlegm could mean the following:

• The thickened mucus that accompanies many illnesses is often darker and yellow-colored compared to normal, clear, thin mucus. Yellow mucus in the throat or nose could indicate infection. If the infection lasts longer, the mucus could turn green. A change in mucus color is often an important sign to share with your healthcare provider.
• Greenish mucus means that the mucus contains infection-fighting white blood cells. Green mucus in the nose could indicate a sinus infection, such as acute sinusitis, or other infections, such as a cold or flu.
• What does white mucus mean? White mucus can indicate the early stages of an infection or congestion. Inflammation of the nasal tissues, often caused by a virus or irritants, slows the flow of mucus, causing it to lose moisture and become thick and cloudy. White mucus may simply indicate a nasal infection or cold.
• Blood-tinged or brownish mucus is also common with upper respiratory infections, especially if the inside of the nose has become irritated or scratched.

While a small amount of blood in mucus is normal, you should see a health care professional if there is excessive bleeding.

Saline nasal rinses, including neti pots, are an option for those who would like to get rid of excess mucus without taking medications. Bulb syringes and squeeze bottles are other methods to do nasal irrigation. Saline nasal sprays may also be helpful.

All these techniques thin out the mucus and help clear the airways and sinuses. Always use sterile saline rinses that can be purchased, or use distilled, previously boiled, or sterile water to make up the solution. Using non-sterile tap water has a small chance of introducing an infection into the airways and sinuses.

Certain medications are also able to help thin mucus and enhance the body's ability to remove it.

Neti pots and other methods for nasal irrigation work using the same principle:

• A saline (saltwater) solution is injected into one nostril.
• This loosens up all the mucus in the nasal cavity.
• The water drains out the other nostril.

Be sure that any solution you use for nasal irrigation is made with sterile (such as previously boiled) water.

Several over-the-counter (OTC) medications can help reduce mucus production or help with the removal of mucus. Decongestants and antihistamines are two kinds of drugs that may help relieve symptoms of a cold or flu.

Decongestants reduce blood flow to the lining tissues of the nose and throat, so your body may produce less mucus. They may help you breathe easier when you have a stuffy nose, but because they are drying, they may have the unintended effect of thickening the mucus that is present. Decongestants should be used only under physician supervision in persons with high blood pressure or heart disease.

Antihistamines block or limit the action of histamines, substances produced during allergic reactions that cause the lining tissues in the nose to produce more mucus. Older or first-generation antihistamines can be sedating, but newer types of antihistamines can be taken during the day with little sedating effect.

An additional kind of medication that can help thin out mucus is guaifenesin. Guaifenesin is a type of drug called an expectorant. Expectorants make the mucus thinner so it is easier to cough up.

• Is mucus a cough? No, mucus and cough are not the same, but they are related. Coughing is a reflex action that helps clear the airway of irritants or excess phlegm.
• What is mucus in the throat? Mucus that originates in the throat is known as phlegm or sputum. It serves to lubricate the throat tissue, protect it from irritation, and trap harmful particles and pathogens.
• What is mucus in human lungs? Mucus produced in the lungs is known as phlegm or sputum. It serves to protect the body from infections and helps trap and expel foreign particles and pathogens.
• What naturally kills mucus? Hydrating yourself by drinking plenty of water and moisturizing the throat and nasal passages can naturally reduce excess mucus and phlegm. However, these methods do not eliminate or kill mucus, as it is a crucial component of the body’s defense mechanisms. Excessive mucus may indicate an infection or other conditions that may require treatment.
• How do I permanently stop mucus? You cannot permanently stop mucus, as it plays a vital role in your body. However, you can reduce excess mucus and phlegm by staying hydrated, using a humidifier, gargling with salt water, and utilizing a saline nasal spray or rinse.
• What foods stop mucus? Some foods that can help reduce mucus production include onion, honey, ginger, garlic, and peppermint.