Constant mucus or phlegm in the throat can be frustrating, especially when you repeatedly feel the need to clear your throat, swallow, or cough. While occasional mucus is completely normal, persistent throat mucus can have several different causes, and finding the underlying reason is usually more useful than simply trying to suppress the symptom.
One of the most common causes is postnasal drip. Your nose and sinuses naturally produce mucus, and normally you swallow it without noticing. When allergies, a cold, sinus irritation, or other nasal problems increase mucus production, it can drain toward the back of the throat and create the sensation of having something stuck there.
Allergies can make this particularly noticeable. Exposure to dust, pollen, mold, animal dander, or other triggers can cause congestion and increased mucus production. You may also experience sneezing, an itchy nose, watery eyes, or nasal congestion.
Another common cause is acid reflux. Stomach contents can travel upward toward the esophagus and throat, irritating the tissues and creating a sensation of mucus or a lump in the throat. Some people experience classic heartburn, while others mainly notice throat clearing, coughing, hoarseness, or an unpleasant taste.
Smoking and exposure to cigarette smoke can also irritate the airways and increase mucus production. Vaping and exposure to other airborne irritants may similarly contribute to throat and respiratory irritation.
Dehydration can make existing mucus feel thicker and harder to clear. Drinking enough fluids throughout the day can help keep secretions less concentrated. Warm liquids can also provide temporary soothing relief for an irritated throat.
A recent cold or respiratory infection can leave mucus and coughing behind even after the main symptoms have improved. The airways can remain irritated for some time, so the sensation of phlegm does not necessarily mean that a new infection has developed.
Certain medications and medical conditions can also contribute to nasal congestion, dry mouth, coughing, or changes in mucus. If the problem began after starting a new medication, it is worth discussing the timing with a healthcare professional rather than stopping the medication on your own.
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