If you often feel the need to clear your throat, especially in the morning or after meals, youโre not alone. That sticky or thick substance is phlegm, and while it can be annoying, it is usually the bodyโs natural way of protecting itself.
Phlegm is a type of mucus produced by glands lining the nose, throat, and lungs. Its job is to trap dust, allergens, and germs before they reach deeper parts of the respiratory system. Problems arise when the body produces too much of it.
Here are the most common reasons why phlegm builds up in the throat:
1. Post-nasal drip
This happens when mucus from the nose or sinuses flows down the back of the throat.
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Often triggered by allergies, colds, or sinus infections
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Can worsen during cold weather or in dry environments
This is the most common cause of throat phlegm.
2. Respiratory infections
Colds, flu, bronchitis, and other infections prompt the body to produce more mucus to trap viruses and bacteria.
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Phlegm may turn yellow or green
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Usually clears once the infection resolves
3. Allergies
Dust, pollen, pet dander, and mold can inflame the airways.
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Phlegm is often clear but thick
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May come with sneezing, itchy eyes, or a runny nose
4. Acid reflux
Also known as GERD or โsilent reflux,โ stomach acid can irritate the throat and trigger mucus production.
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Often worse after eating or when lying down
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Can happen even without heartburn
5. Smoking and air pollution
Cigarette smoke and polluted air irritate the throat and lungs.
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Leads to chronic phlegm production
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Common among smokers and those exposed to traffic pollution
6. Dehydration
Not drinking enough water makes mucus thicker and harder to clear.
7. Chronic conditions
Persistent phlegm may be linked to:
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Chronic sinusitis
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Asthma
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Chronic bronchitis
When should you see a doctor?
Medical advice is recommended if phlegm:
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Lasts more than three weeks
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Contains blood
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Comes with fever, chest pain, or unexplained weight loss
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Has a strong, foul smell
How to reduce phlegm
Several ways to reduce phlegm include drinking plenty of water; taking warm fluids like tea or soup; inhaling steaml; avoiding smoking and allergens; and eating smaller meals and avoid lying down immediately after eating.
In most cases, phlegm is harmless and temporary.
But when it persists, it may be your bodyโs way of signaling an underlying problem that needs attention.
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