Constant phlegm or a feeling of mucus stuck in the throat is common, but it can have several different causes. It isn’t necessarily a sign of excess mucus production or a serious disease.
Common causes
Postnasal drip: Allergies, colds, sinus problems or nasal irritation can cause mucus to drain down the back of the throat, leading to repeated swallowing and throat-clearing.
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Acid or “silent” reflux: Reflux can irritate the throat and cause mucus, chronic throat clearing, cough or a lump-like sensation—even without typical heartburn.
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Allergies: Pollen, dust mites, mold and pet dander can stimulate mucus production and postnasal drip.
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Smoking and air pollution: Smoke and other irritants can increase mucus and inflammation.
Respiratory conditions: Asthma, bronchitis, COPD and infections can produce phlegm, particularly when it is coming from the lower airways.
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Dehydration and dry air: These can make normal mucus thicker and more noticeable.
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What may help
Drink enough water, use a saline nasal spray or rinse if nasal congestion/postnasal drip is involved, and consider a clean cool-mist humidifier if the air is dry. Gargling warm salt water can also soothe an irritated throat.
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If reflux seems likely, avoid lying down soon after eating and consider reducing foods or drinks that clearly trigger your symptoms. Reflux symptoms commonly worsen when lying down.
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Try not to constantly forcefully clear your throat—that can further irritate the throat and perpetuate the sensation. Sipping water instead can be gentler.
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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 fever, unexplained weight loss, night sweats, significant nasal obstruction, persistent hoarseness, difficulty swallowing, shortness of breath, chest pain, or blood in the mucus.
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The key is finding the cause rather than simply trying to “dry up” the mucus. Allergies, postnasal drip and reflux require quite different treatments.
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