Most common causes of persistent phlegm
1. Allergies
Dust, pollen, mites, or pet hair can cause excessive mucus production.
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Associated symptoms:
- Sneezing
- Nasal itching
- Teary eyes
2. Gastric reflux
Stomach acid can rise to the throat and irritate it, causing a constant feeling of phlegm, even without a cough.
Other signs:
- Burning sensation in the chest
- Bitter taste in the mouth
- Frequent throat clearing
3. Sinusitis
When the sinuses become inflamed, mucus can drain down into the throat (postnasal drip).
It can be accompanied by:
- Congestion
- Facial pain
- Headache
4. Changes in climate or dry air
Cold or very dry air can irritate the airways and stimulate more mucus production.
