Mucus, a fluid in your upper respiratory system, is usually clear. But a number of health conditions can cause it to turn brown. Also known as brown phlegm or sputum, brown mucus can be due to a range ...

Your body produces mucus naturally to protect your respiratory system, and under normal circumstances, this protective fluid remains clear and relatively thin. However, when mucus suddenly changes to ...

Coughing up blood is usually a cause for concern and should be addressed immediately. Serious conditions that may cause you to cough blood are lung cancer and congestive heart failure. Seek emergency ...

Chronic obstructive pulmonary disease (COPD) affects approximately 29 million people in the U.S. and is the fourth leading ...

In a lab study, scientists have pinpointed a potential way to "break the inflammatory cycle" of asthma. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

Clear, bubbly phlegm does not typically indicate a problem. However, coughing up large amounts could indicate an underlying health issue, such as fluid in the lungs. Phlegm, or sputum, is a type of ...

It’s never any fun feeling under the weather, but when a common cold is paired with excess phlegm, it makes matters even worse. This can lead to irritating symptoms, such as coughing, a sore throat, ...

But what happens when the body produces too much mucus that is too thick, viscous and dehydrated to move and clear properly? Overly thick and sticky mucus over time can obstruct the airway, ...

One of the biggest concerns with upper respiratory tract infections, like the common cold or a nasal infection, is the ...

A hospital-acquired bacterium that causes serious infections can move from the lungs to the gut inside the same patient, ...