Constant phlegm or the feeling of mucus stuck in your throat is common, but it can have several different causes. The mucus itself is usually not harmful; the important question is why you’re producing more of it or why you’re noticing it.
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Common causes
Postnasal drip — Mucus draining from the nose into the throat can cause repeated swallowing, coughing, throat clearing and a “lump” sensation. Allergies, colds, sinus problems and nasal irritation can all contribute.
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Allergies — Pollen, dust mites, pets and other allergens can increase nasal secretions and lead to mucus in the throat.
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Acid or “silent” reflux — Reflux can irritate the throat even without classic heartburn. Excess mucus, hoarseness, coughing and frequent throat clearing can occur, often becoming worse after meals or when lying down.
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Dry air, dehydration or mouth breathing — These can make mucus thicker and more noticeable.
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Smoking and environmental irritants — Cigarette smoke, pollution, strong fragrances and fumes can irritate the nose and throat and promote mucus production.
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Recent respiratory infection — A cold, flu, bronchitis or sinus infection can leave increased mucus for a while after the initial illness improves.
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What can help
Drink enough water to keep mucus less thick.
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Cleveland Clinic
Try a saline nasal rinse if you have nasal congestion or postnasal drip. Use properly prepared/sterile water according to the product instructions.
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A humidifier may help when indoor air is dry.
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Cleveland Clinic
Avoid repeatedly forcefully clearing your throat; this can irritate the throat and create a cycle of more throat-clearing. Sip water instead.
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West Suffolk NHS Foundation Trust
If reflux seems likely, avoid eating close to bedtime and discuss persistent symptoms with a clinician.
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Cleveland Clinic
If allergies are suspected, a pharmacist or doctor can advise on appropriate allergy treatment.
Don’t assume yellow or green mucus automatically means you need antibiotics; mucus color alone doesn’t establish a bacterial infection.
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Cleveland Clinic
If the problem persists for several weeks, or you develop difficulty swallowing, unexplained weight loss, persistent hoarseness, breathing difficulty, chest pain, or blood in your phlegm, seek medical evaluation.
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