Is Coughing Up White Mucus a Sign of Respiratory Problems?

Coughing up white mucus can mean you have congestion with a respiratory infection such as bronchitis, or it can be a symptom of long-term health issues like chronic obstructive pulmonary disease (COPD). The color of your mucus can suggest what is causing it, but not always.

Your healthcare provider might ask you about the color of your mucus, but they usually can’t diagnose you based on mucus color alone. They will also want to know about the consistency (thickness) and other characteristics of the mucus that you are coughing up.

Causes

The function of mucus is to lubricate and protect delicate structures. It can trap small particles (such as germs and dust), making it easier for them to be safely removed from the body.

White mucus can be caused by:

• A virus or other pathogen. However, respiratory tract mucus (sputum) infected with bacteria tends to be green, yellow, or another color, not clear or white.
• A condition like pneumonia, COPD, or asthma

There are a number of potential causes of white mucus.

Bronchitis

Bronchitis is an inflammation of the airways in the lungs. The swelling contributes to the increased production of mucus. Bronchitis may be caused by a viral infection or by exposure to pollutants, such as cigarette smoke.

If you have bronchitis, you may have other symptoms such as:

• Fever
• A feeling of discomfort in the chest
• A persistent sore throat

Bronchitis usually resolves on its own with rest and good hydration. Try using a humidifier to help relieve your symptoms. 

Viral Respiratory Infection

The development of a cough with white mucus could indicate that you are coming down with a cold or other viral respiratory infection, including the potentially serious respiratory syncytial virus (RSV).

This type of infection usually affects the upper respiratory tract, including your lungs, throat, and sinuses. Influenza and COVID-19 are examples of viruses that cause this type of infection. Other symptoms may include:

Unlike illnesses that are caused by bacteria, viral respiratory infections cannot be treated with antibiotics. Instead, treatment is focused on helping your immune system fight the infection.

Things you can do to help your body fight a viral infection that is causing a cough include getting plenty of rest, nourishing your body, and increasing your fluid intake.

Using a cool-mist humidifier and saline nasal sprays can help thin the mucus and make it easier to clear. Lozenges (cough drops) can also help relieve symptoms.

Asthma

When you have asthma, your body may produce excess mucus, and swollen, inflamed tissues can slow its ability to flow through the respiratory passageways.

Other symptoms of asthma include:

Asthma can’t be cured, but it can be managed with medication and the right treatment plan. Avoiding your triggers can also help you keep your asthma under control.

Allergies and Irritants

Substances that irritate your nasal or bronchial passages or that trigger histamine responses can cause excessive mucus in your respiratory tract.

White or clear phlegm is most common. Allergy treatment can include taking an antihistamine, using a nasal steroid spray, or consulting with an allergy specialist.

Dehydration

Thick, white mucus can occur from dehydration. Increasing your fluid intake and using a cool-mist humidifier next to your bed at night can help thin out your mucus and make it easier to clear.

Chronic Obstructive Pulmonary Disease

White mucus can also appear foamy or frothy if there are large amounts of air bubbles in it. A small amount of foamy white mucus is not usually a concern; however, coughing up a larger amount of foamy mucus can indicate a serious illness such as COPD.

Other symptoms of COPD include:

• Feeling short of breath
• Wheezing

COPD can be managed with short- or long-acting bronchodilator inhalers. Your healthcare provider may prescribe a steroid inhaler if first-line treatments aren’t working. Certain oral medications can also help.  

Gastroesophageal Reflux Disease (GERD)

People with gastroesophageal reflux disease (GERD) may cough up foamy, white mucus. This usually occurs along with other symptoms such as:

• Heartburn and acid reflux
• Pain in the upper abdomen
• Trouble swallowing

If your cough is caused by GERD, medications called proton pump inhibitors (PPIs) can be helpful. Also, try elevating your upper body while lying down to prevent reflux of stomach acid in the esophagus.

Losing weight and changing your diet can also offer relief. Severe cases of GERD might require surgical intervention.

Pulmonary Edema

Pulmonary edema causes fluid to build up in the lungs. This can make you cough up white or pink foamy mucus. Other symptoms of pulmonary edema include:

• Trouble breathing
• Wheezing
• A tight feeling in the chest

Pulmonary edema is considered a medical emergency, treated in the hospital with oxygen and medication. If you have any of these symptoms, seek emergency care right away.

Heart Problems

Sometimes, coughing can be a sign of heart failure. If you have a cardiac cough, you may cough up white mucus or mucus that is pink or blood-tinged. This type of cough doesn’t resolve with time.

Heart failure can’t be reversed, but it can be managed with lifestyle changes, medication, and surgery. Following your healthcare provider’s instructions can help improve your symptoms.

Cystic Fibrosis

Cystic fibrosis (CF) is an inherited, life-threatening disorder that damages the lungs and digestive tract.

CF causes excessive production of thick mucus that clogs the airways. Symptoms become progressively worse and severe. In addition to breathing problems and recurrent lung infections, people with CF may experience poor growth, infertility, and chronic inflammation of various organs.

While there is no cure for CF, there are treatments that can improve both the length and quality of one’s life.

Treatment of CF requires the clearing of mucus in the airways. This may involve using special breathing or coughing techniques; devices like therapy vests to loosen mucus; or physical therapy.

Managing Symptoms

Depending on the underlying cause of your white mucus, you may be able to self-treat the excess mucus with home remedies. Otherwise, an OTC or prescription medication may be useful for your symptoms.

Home Remedies

These at-home treatments may help to relieve coughing and congestion:

• Stay hydrated: Drink plenty of fluids, especially warm, clear fluids like water, tea, and broth to loosen up mucus so that it is easier to cough up and leave your system.
• Avoid triggers and other irritants: If you know what allergen or irritant is triggering mucus, do your best to avoid it. This also means staying away from people who are sick, and staying indoors when environmental allergens are high.
• Keep your head elevated: Use extra pillows at bedtime to elevate your head and chest. This will prevent phlegm from pooling in your throat and assist with drainage.
• Gargle with salt water: Swish some salt water around in your mouth two to three times per day to loosen thickened mucus.
• Try a sinus rinse: Using a neti pot, saline spray, or saline drops with a bulb syringe, you can flush your sinuses. This thins out excess mucus and makes it easier to breathe.
• Use eucalyptus: Add a few drops of eucalyptus essential oil to a vaporizer or neti pot that you can use for steam inhalation. Combined with steam, the eucalyptus will help thin mucus and flush out your sinuses.
• Take a hot shower: Similar to other forms of steam inhalation, taking a hot shower will thin mucus so that it is easier for your body to expel.

Medications

If home remedies are not enough to relieve congestion and clear your sinuses, consider OTC medications. Your healthcare provider may also prescribe medication:

• Decongestants like Sudafed (pseudoephedrine) and Vicks Sinex (oxymetazoline). contain either pseudoephedrine or phenylephrine. These medicines can help stop mucus production.
• Expectorants thin and loosen mucus in your lungs and lubricate your airways so that it is easier for your body to expel the mucus through coughing. The drug guaifenesin is the only FDA-approved expectorant available in the United States, and it is available over the counter under the brand name Mucinex.
• If you have mucus with asthma or COPD, your provider may prescribe a bronchodilator such as albuterol. Although albuterol does not break up mucus itself, it does open the airways to help you cough and expel mucus more productively.
• Viral pneumonia isn’t typically treated as it usually goes away on its own. However, bacterial pneumonia may be treated with antibiotics. Again, antibiotics don’t treat mucus, but the mucus should dissipate once the bacterial infection resolves.

When to Call a Healthcare Provider

Most conditions that cause a cough with white mucus will go away with rest and self-care. If you have certain symptoms or your symptoms persist, however, call your healthcare provider. For example:

• Your cough lasts for more than three weeks
• You are left breathless from coughing
• The color of your mucus changes.
• Symptoms, including how much mucus you’re coughing up, is not improving or is getting worse
• You’re unable to do normal daily activities

What Other Colors of Mucus Mean

The color and consistency of mucus can give your healthcare provider clues as to what is causing your cough. Besides white mucus, you may also have mucus that is:

• Clear: Normal, healthy sputum is clear because it contains mostly water. Some respiratory conditions can produce clear sputum with changes in the consistency or amount, especially early in the course of the illness.
• Yellow or green: Yellow or green sputum is called “purulent” because it contains pus. While a healthcare provider cannot diagnose a bacterial infection based on the color of mucus alone, studies have found that green or yellow sputum is more likely than other colors of mucus to be caused by bacterial infections.
• Brown: Mucus may appear brown if it contains old blood or if you have inhaled a significant amount of dirt (such as a dust storm). If the old blood comes from the lungs, it can be a serious sign of hemoptysis caused by lung cancer, bronchitis, or pneumonia. In rare cases, it can be caused by tuberculosis.
• Red: Mucus may appear red if there is fresh blood in it. While fresh blood in your mucus can be a sign of cancer, it can also be a sign that you have been coughing too hard and your nasal tissues are irritated. If you are a smoker and coughing up blood, you should be seen by a healthcare provider right away.
• Black: Black sputum can be caused by inhaling something black, such as coal dust. It can also be caused by an infection (typically those that are caused by a fungus or tuberculosis) or death of lung tissue (pulmonary infarction).

Summary

Coughing up white mucus has several possible causes. Your healthcare provider won’t be able to figure out what is causing the mucus just by looking at it. In some cases, they might need to test a sample of the mucus to see if there are specific pathogens in it.

If you are concerned about your coughing or mucus production, call your healthcare provider. While occasional white mucus is likely not a reason to worry, coughing up a lot of white mucus, mucus that has blood in it, or coughing up mucus when you also have other symptoms can be signs of a more serious condition.

A Word From Verywell

While symptomatic treatment of a cough can lessen discomfort, it’s extremely important to determine the root cause if it is prolonged. Viral/bacterial infections, chronic respiratory and cardiac conditions, allergies, and GERD may all present similarly with a cough, but treatment differs greatly. It’s imperative to have a medical evaluation to hasten recovery and prevent future episodes.