The Real Causes of Constant Phlegm and Mucus in the Throat
Constant throat mucus is common, but it isn’t necessarily a sign that your body is “full of toxins.” Your nose, sinuses and throat naturally produce mucus every day. The sensation becomes noticeable when mucus becomes thicker, production increases, or it drains into the throat.
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Common causes
Postnasal drip: Allergies, colds, sinusitis, dry air and nasal irritation can cause mucus to run down the back of your throat. This often causes frequent throat-clearing or coughing.
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Allergies: Pollen, dust mites, mold and pets can increase nasal mucus.
Acid reflux/LPR: Reflux reaching the throat can cause throat clearing, chronic cough, hoarseness and a sensation of excessive mucus—even without typical heartburn.
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Smoking and air pollution: Smoke and other irritants can increase mucus and inflame the airways.
Asthma or chronic lung disease: Persistent phlegm accompanied by coughing, wheezing or breathlessness can sometimes indicate an airway condition such as asthma or COPD.
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Dehydration or dry air: These can make mucus thicker and harder to clear.
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Certain medications: Some medicines can contribute to nasal symptoms or dryness.
What can you do?
Drink enough water throughout the day to keep secretions thinner.
Try a saline nasal spray or rinse if you have congestion or postnasal drainage. If using a nasal rinse, use appropriately sterile/distilled or previously boiled water.
A clean cool-mist humidifier may help if the air is dry.
Avoid cigarette smoke and other respiratory irritants.
If allergies are suspected, treating the allergies is more useful than simply trying to suppress mucus.
If reflux seems likely, avoid eating for several hours before lying down and identify foods or drinks that trigger your symptoms. Reflux commonly becomes worse when lying down.
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Don’t assume yellow or green mucus automatically means you need antibiotics. Mucus color alone doesn’t reliably establish a bacterial infection.
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When should you get checked?
See a healthcare professional if the problem persists for several weeks, keeps worsening, or is accompanied by:
Blood in the mucus
Fever or night sweats
Unexplained weight loss
Wheezing or shortness of breath
Chest pain
Persistent or worsening cough
Difficulty swallowing
Persistent phlegm without an obvious cold can sometimes be related to asthma, COPD, reflux, chronic sinus disease or another underlying condition, so treating the cause is much more effective than relying on a “mucus-cleansing” drink.
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