The Real Causes of Constant Phlegm and Mucus in the Throat
Having mucus in your throat isn’t necessarily a sign of disease. Your nose, sinuses and throat normally produce mucus to trap irritants and keep tissues moist. The problem is when you consistently feel excessive mucus, postnasal drainage, or a need to clear your throat.
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Common causes
Postnasal drip — allergies, colds, sinus problems, nasal polyps and irritation can cause mucus to drain down the back of your throat.
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Allergies — pollen, dust mites, mold and pet dander can increase mucus production.
Acid reflux/LPR — reflux reaching the throat can cause excessive mucus, throat clearing, hoarseness and a persistent “lump” sensation, sometimes without typical heartburn.
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Smoking or air pollution — smoke and other irritants can stimulate mucus production.
Respiratory infections — colds, flu, sinusitis and bronchitis can temporarily increase mucus.
Asthma or chronic lung disease — particularly when phlegm is coming from the chest rather than simply feeling stuck in the throat.
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Dry air or dehydration — mucus can become thicker and more noticeable.
What you can do
Drink enough water to keep mucus thinner.
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Try a saline nasal spray or rinse if you have nasal congestion/postnasal drip. For homemade rinses, use properly boiled and cooled water as directed by a reputable medical source.
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A cool-mist humidifier may help if your indoor air is dry.
Avoid smoke and other respiratory irritants.
If reflux seems likely, avoid eating for about 3 hours before bed and consider elevating your upper body while sleeping.
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Instead of repeatedly force-clearing your throat, try sipping water or swallowing; frequent throat clearing can further irritate the throat.
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Don’t assume green or yellow mucus automatically means you need antibiotics—mucus color alone doesn’t reliably prove a bacterial infection.
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When to get checked
See a healthcare professional if the problem persists for several weeks, keeps returning, or is accompanied by difficulty swallowing, unexplained weight loss, persistent hoarseness, fever, night sweats, significant nasal obstruction, or blood in the mucus.
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If you’re coughing up phlegm from your chest for two weeks or more, particularly if you’re short of breath or have chest pain, you should also be evaluated.
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