Discover 6 alarming reasons why your mucus turns brown and what this color change means for your health. Learn when to seek medical help immediately.

Medically reviewed by Amelia MacIntyre, DO 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 ...

Mucus is usually clear when you're not sick. So it can be startling when your boogers are suddenly as yellow as the sun.

Now, researchers describe their success in creating a mucus-based bioink for 3D printing lung tissue. This advance could one day help study and treat chronic lung conditions.

This article explores the various causes of brown discharge before a period. It discusses what this may mean if a person is pregnant, not pregnant, or approaching menopause.

You may see brown discharge throughout your cycle, usually around menstruation. Blood exposed to air oxidizes, causing it to appear light or dark brown.

Researchers developed a mucus-based bioink for 3D printing lung tissue, offering a potential breakthrough in studying and treating chronic lung conditions.

Boogers are dried nasal mucus (snot) that protect you against infections and allergens. Colors, like green or yellow boogers, can tell you about your health.

Brown or orange Brown or orange mucus may result from dried blood mixing with mucus, or from inhaling environmental debris —such as smoke or dust.