Why Do I Have Lots Of Phlegm?

Phlegm is a thick, sticky substance produced by the respiratory system to protect the lungs and airways from irritants, such as dust and pollen. However, excessive production of phlegm can be a sign of an underlying health condition. In this article, we will explore the possible reasons why someone may have lots of phlegm.

Respiratory Infections

Respiratory infections, such as the common cold, flu, and bronchitis, are common causes of increased phlegm production. These infections can irritate the lining of the respiratory tract, causing the body to produce more mucus to protect the airways. As the infection clears, the excess phlegm is typically expelled through coughing.


Allergies to environmental triggers, such as pollen, dust mites, and pet dander, can also lead to excessive phlegm production. The immune system responds to these allergens by releasing histamine, which causes inflammation and increased mucus production. This can result in a runny nose, coughing, and congestion.


Smoking is a major cause of increased phlegm production. The chemicals in tobacco smoke can irritate the respiratory system, causing the body to produce more mucus to protect the lungs. Over time, this can lead to chronic bronchitis, a condition characterized by persistent cough and excess phlegm production.

Gastroesophageal Reflux Disease (GERD)

GERD is a digestive disorder in which stomach acid flows back into the esophagus, causing irritation and inflammation. This can trigger the production of excess mucus in the throat and chest, leading to a persistent cough and phlegm production.

Chronic Obstructive Pulmonary Disease (COPD)

COPD is a group of lung diseases, including emphysema and chronic bronchitis, that cause breathing difficulties and chronic cough. These conditions can lead to increased phlegm production, which can exacerbate symptoms and increase the risk of respiratory infections.

Environmental Factors

Exposure to environmental pollutants, such as air pollution and industrial chemicals, can also lead to increased phlegm production. The body produces more mucus to protect the respiratory system from these irritants, which can lead to chronic cough and congestion.


While phlegm is a natural part of the respiratory system’s defense mechanism, excessive production can be a sign of an underlying health condition. Respiratory infections, allergies, smoking, GERD, COPD, and environmental factors are all potential causes of increased phlegm production. If you are experiencing persistent cough and phlegm, it’s important to consult with a healthcare professional to determine the underlying cause and receive appropriate treatment.

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