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Having green, yellow, or thickened phlegm (sputum) does not always indicate the presence of an infection. Also, if an infection is present, the color of the phlegm (sputum) does not determine whether a virus, a bacterium or another pathogen has caused it. Simple allergies can also cause changes in the color of the mucus. [1]
Its color can vary from transparent to pale or dark yellow and green, from light to dark brown, and even to dark grey depending on the contents. [1] The body naturally produces about 1 quart (about 1 litre) of phlegm every day to capture and clear substances in the air and bacteria from the nose and throat.
The bacteria camp out inside the lungs and cause very gradual changes in the consistency and appearance of phlegm." If you have chronic lung disease, you may be used to seeing brown phlegm, notes ...
The green color of mucus comes from the heme group in the iron-containing enzyme myeloperoxidase secreted by white blood cells as a cytotoxic defense during a respiratory burst. In the case of bacterial infection, the bacterium becomes trapped in already-clogged sinuses , breeding in the moist, nutrient-rich environment.
The mucus starts off as clear, so this is often an early sign you have a cold. Over the next several days, the mucus color may change to white, yellow or green.
The color of your mucus can reveal some surprising things about your health. Here's what your mucus color means, according to experts.
Acute bronchitis, also known as a chest cold, is short-term bronchitis – inflammation of the bronchi (large and medium-sized airways) of the lungs. [2] [1] The most common symptom is a cough. [1] Other symptoms include coughing up mucus, wheezing, shortness of breath, fever, and chest discomfort. [2] The infection may last from a few to ten ...
Long-term irritation of the epithelial cells can cause the overproduction of mucus, known as mucus hypersecretion. Mucus hypersecretion results in the productive cough of chronic bronchitis. [18] Pulmonary neuroendocrine cells have been associated with a range of chronic lung disorders. They are also the originating cells of small-cell lung ...