However, mucus may appear brown due to the "presence of aged blood, airborne irritants such as dust and smoke or pre-existing mucus located in the deeper sinuses," says Dr. Chicak.

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

Mucus lines your lungs, throat, mouth, nose, and sinuses. While it is always present, it can become thicker or change color due to allergies, a cold, or a respiratory infection.

It’s snot a laughing matter. The color of nasal mucus can help show what state of health a person is in, according to ear, nose and throat specialist Dr. Raj Sindwani of the Cleveland Clinic ...

Though it may be offputting, mucus is a vital part of the body's protection. The color of your boogers can help you figure out what's going on in your body. Here's what the color of your snot ...

Regular mucus tends to be thin and slippery, and it is generally a constant presence on a day-to-day basis. Meanwhile, phlegm ...

A change in mucus color alone does not indicate bacterial infection. The common cold mostly causes acute sinusitis. Unless a bacterial infection develops, most cases resolve within a week to 10 days.

Mucus Color Meanings You’ve likely noticed mucus shows up in a range of colors and textures when you’re sick, sniffly, or congested, or have a condition like a sinus infection.

The color of your mucus can point to signs of what underlying condition is causing the phlegm. “Problems in the lungs can cause phlegm to change color,” Dr. Sonpal says.

Fungal sinus infections—medically known as fungal sinusitis—occur when various fungi invade the sinuses, those air-filled cavities in the head that produce the mucus necessary for clear nasal ...

A sinus infection, ... The swelling makes it hard for your sinuses to drain, and mucus builds up. ... the color of your mucus does not help tell the difference between allergies or sinus infections.

“In general, darker color can be caused from mucus that has been sitting in the sinuses for a longer time,” explains Dr. Anthony Zabel, MD, a primary care physician at Indiana University Health.