Constant phlegm or the feeling of mucus stuck in your throat can be uncomfortable, but it’s a symptom rather than a disease. The most effective treatment depends on the underlying cause.
Common causes
- Postnasal drip
- Mucus from the nose or sinuses drains down the back of the throat.
- Often caused by allergies, colds, or sinus infections.
- Acid reflux (GERD or laryngopharyngeal reflux)
- Stomach acid can irritate the throat, causing a “lump in the throat” sensation, frequent throat clearing, or excess mucus.
- Allergies
- Seasonal or year-round allergies can increase mucus production.
- Viral infections
- Colds and flu commonly increase mucus for days to weeks.
- Smoking or exposure to irritants
- Tobacco smoke, air pollution, or chemical fumes can stimulate mucus production.
- Dry air or dehydration
- Thick mucus is often harder to clear.
- Less common causes
- Chronic sinusitis
- Asthma
- Certain medications
- Rarely, more serious conditions affecting the throat or lungs
What may help
- Stay well hydrated to help thin mucus.
- Use saline nasal sprays or rinses if nasal congestion or postnasal drip is contributing.
- Avoid smoking and minimize exposure to irritants.
- Manage allergies by reducing exposure to triggers and, if appropriate, using allergy treatments recommended by a healthcare professional.
- If reflux is suspected:
- Avoid large meals close to bedtime.
- Limit foods that trigger your symptoms.
- Elevate the head of your bed if nighttime reflux is a problem.
When to seek medical care
See a healthcare professional if:
- Symptoms last more than 3–4 weeks.
- You have blood in your mucus.
- You develop difficulty swallowing, persistent hoarseness, or unexplained weight loss.
- You have high fever, chest pain, or shortness of breath.
- You produce large amounts of foul-smelling mucus or have repeated lung infections.
Most cases improve once the underlying cause—such as allergies, a viral infection, or reflux—is identified and treated. If your symptoms have been ongoing, let me know:
- How long you’ve had them
- Whether the mucus comes from your nose or chest
- Its color (clear, white, yellow, green, or bloody)
- Whether you also have heartburn, cough, or nasal congestion
