What Is Phlegm?
Phlegm is a type of mucus produced by the respiratory system, primarily in the lungs and throat. Unlike the thin, clear mucus that lines the nasal passages, phlegm is usually thicker and can appear yellow, green, or white. It plays an important role in trapping dust, allergens, and infectious agents like bacteria and viruses, helping to protect the body from illness.
The Role of Phlegm in the Body
While phlegm can be unpleasant, it serves as a crucial defense mechanism. It helps to keep the respiratory tract moist and acts as a filter against harmful particles that enter the body through the air. When the body detects an irritant or infection, it responds by producing more phlegm to flush out these invaders, which is why it often increases during colds or allergies.
Common Causes of Phlegm Buildup
Phlegm accumulation is most commonly caused by respiratory infections, such as the common cold, flu, or bronchitis. Other triggers include allergies, smoking, pollution, or chronic conditions like asthma and chronic obstructive pulmonary disease (COPD). These irritants or infections stimulate the mucous membranes to produce more phlegm as a protective response.
When to Seek Medical Advice
While occasional phlegm is normal, persistent or excessive production may indicate an underlying issue. If you notice changes in color, consistency, or if phlegm is accompanied by symptoms like fever, chest pain, or difficulty breathing, it’s important to consult a healthcare professional. Proper diagnosis and treatment can help clear the airways and restore comfort and health.
