If you’re turning this into a health article, the headline is reasonable, but “the real causes” suggests there is one definitive explanation. Persistent throat mucus can have several causes, most commonly postnasal drip, allergies, reflux, infection, irritation, or sometimes a respiratory condition. (Cleveland Clinic)

The Real Causes of Constant Phlegm and Mucus in Your Throat — And What Can Help

Feeling as though you constantly have mucus stuck in your throat can be frustrating. You may find yourself repeatedly swallowing, coughing or clearing your throat throughout the day.

Mucus itself is normal. Your nose, sinuses and throat continually produce it to moisturize tissues and trap particles. The problem is when mucus becomes excessive, thick or noticeable. (Cleveland Clinic)

1. Postnasal drip

One of the most common explanations is postnasal drip—mucus draining from the nose or sinuses down the back of the throat.

It can happen with allergies, colds, sinus problems, nasal irritation and changes in weather. You may notice a sensation of mucus dripping, frequent swallowing, throat clearing, hoarseness or coughing. (Cleveland Clinic)

What may help

If allergies are responsible, reducing exposure to the trigger and using appropriate allergy treatment can help. A saline nasal spray or rinse may also help clear and moisturize the nasal passages. (Cleveland Clinic)

2. Allergies

Pollen, dust mites, mold and animal dander can trigger increased mucus production. That mucus may then drain into your throat.

Allergy-related postnasal drip can create a cycle in which mucus irritates the throat, causing you to clear your throat repeatedly, which can create even more irritation. (Cleveland Clinic)

If symptoms appear seasonally or worsen around particular environments, allergies may be an important clue.

3. Acid reflux

You don’t always have to experience classic heartburn for reflux to affect your throat.

Laryngopharyngeal reflux (LPR) can cause throat clearing, chronic cough, hoarseness, a lump-like sensation and excessive mucus or phlegm. (Cleveland Clinic)

If mucus and throat clearing are particularly noticeable after meals, when lying down or in the morning, reflux may be worth discussing with a healthcare professional.

Lifestyle measures such as avoiding meals close to bedtime and identifying foods or drinks that trigger reflux may help some people. (Cleveland Clinic)

4. A recent cold or sinus infection

A viral respiratory infection can temporarily increase mucus production. Even after other symptoms improve, irritation and mucus can sometimes linger.

Sinusitis can also cause congestion and mucus draining into the throat. (Cleveland Clinic)

The color of mucus alone doesn’t reliably tell you whether an infection is bacterial. (Cleveland Clinic)

5. Dry air and dehydration

Dry indoor air can irritate the nose and throat and make secretions feel thicker.

Drinking adequate fluids and using a clean humidifier when indoor air is particularly dry may make mucus easier to clear. (Cleveland Clinic)

6. Smoking and other irritants

Cigarette smoke, vaping and other airborne irritants can inflame the respiratory tract and contribute to excess mucus.

Reducing exposure can be an important part of improving persistent phlegm. (Cleveland Clinic)

7. Asthma or another respiratory condition

Persistent phlegm isn’t always coming from the nose and throat.

Asthma, COPD and other lung conditions can cause coughing and mucus production. If you also have wheezing, shortness of breath, chest tightness or a persistent cough, a medical evaluation is appropriate. (Cleveland Clinic)

What can you do to clear mucus?

Simple measures may help when there isn’t a serious underlying condition:

Drink enough water to stay adequately hydrated.
Use a saline nasal spray or rinse when nasal congestion or postnasal drip is involved.
Try a clean cool-mist humidifier if the air is dry.
Avoid cigarette smoke and other respiratory irritants.
If allergies are suspected, reduce exposure to known triggers.
If reflux seems likely, avoid eating immediately before lying down and discuss persistent symptoms with a healthcare professional. (Cleveland Clinic)

Try not to repeatedly forcefully clear your throat. Frequent throat clearing can itself irritate the throat and perpetuate the sensation that something is stuck. (Cleveland Clinic)

When should you get checked?

See a healthcare professional if the problem persists for several weeks, keeps getting worse or significantly interferes with eating, sleeping or everyday activities. NHS guidance similarly recommends medical assessment when catarrh lasts longer than a few weeks. (nhs.uk)

Seek prompt medical attention if mucus or phlegm is accompanied by significant shortness of breath, chest pain, coughing up blood, persistent fever, unexplained weight loss or other concerning symptoms. (Cleveland Clinic)

The bottom line

Constant mucus in the throat isn’t necessarily a sign of something serious. Postnasal drip, allergies, reflux, recent infections and environmental irritation are common explanations, while asthma and other lung conditions are possibilities when respiratory symptoms are also present.

The most effective way to get rid of persistent phlegm is to identify and treat the underlying cause, rather than trying to eliminate mucus itself.