Mucus is a thick, slippery fluid that your body produces all the time. It's much more than just a runny nose; it plays a vital role in keeping you healthy.
What Mucus Is and Where It's Found
Mucus is a complex fluid composed primarily of water, salts, and protective immune cells. It acts as a lubricant and protective barrier, lining many parts of your body, including:
- The mouth
- The sinuses
- The eyes
- The lungs
- The stomach
- The urinary tract
The moist inner lining of these organs and body cavities is called a mucous membrane (also known as mucosa). Glands within these membranes produce the mucus. When you're healthy, mucus is usually clear and thin. Changes in color and consistency (thick, yellow, or green) may indicate an infection.
Mucus's Important Role
Mucus performs several crucial functions:
- Protection: It traps and removes foreign particles like dust, bacteria, and viruses, preventing them from entering your body and causing harm.
- Lubrication: It keeps surfaces moist and reduces friction, facilitating smooth movement of food through the digestive tract and air through the respiratory system.
- Immune Defense: It contains immune cells that fight off infection.
While often associated with illness, the constant production of mucus is a normal bodily function essential for health. Excessive mucus production, however, can be symptomatic of various conditions and is often an uncomfortable experience.
Different Names for Mucus and Related Terms
You may encounter other terms related to mucus, including:
- Mucosa: This is another name for mucous membrane.
- Phlegm: This specifically refers to mucus produced in the respiratory tract, often expectorated through coughing.
