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What Are Mucus and Phlegm — and Why They Appear
Mucus is a slippery, protective fluid made by membranes in your nose, throat, sinuses and airways. It traps dust, allergens, microbes and helps moisten the lining of your airways. Cleveland Clinic+2Cleveland Clinic+2
Phlegm is a thicker version of mucus produced deeper in the respiratory system (in throat, bronchi, lungs) usually in response to irritation or infection. Cleveland Clinic+1
When everything is working smoothly, you may barely notice it. But when production goes up, clearance slows, or the mucus changes in consistency, you feel it — as throat clearing, “mucus stuck,” coughing, etc.
Common Causes of Constant Phlegm / Mucus in the Throat
Here are the major triggers — often overlapping — for why you may always feel mucus in your throat.
1. Allergies & Post-Nasal Drip
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