Coughing up mucus is often a sign of a respiratory infection, allergies, gastroesophageal reflux disease (GERD), or an environmental irritant like smoke or pollution. In some instances, it can be ...

Here's what you need to know about why you're coughing up mucus and what it means.

It’s not uncommon when you develop a hacking cough from deep down in your lungs to cough up a gel-like substance known as phlegm, or sputum. While you may think nothing of it, simply associating ...

Coughing up white or clear phlegm balls can be a symptom of many conditions. It usually doesn't signify a serious condition unless you have other symptoms.

But what is green phlegm, exactly, and do you need to see a doctor about it? Here's everything you need to know about that pleasant green phlegm you're coughing up.

Coughing up white mucus or phlegm can indicate several conditions, including asthma, bronchitis, and chronic obstructive pulmonary disease (COPD). In some cases, a person may need to see a doctor.

When you cough and you bring up mucus, that's called a productive cough. Learn all the different things that can cause one.

When a person has black or dark-colored mucus, they may have inhaled potentially harmful pollutants. Coughing up black mucus may also be due to an underlying infection or condition. Mucus serves ...