Phlegm that is coughed up from the lungs signals the presence of an infection or disease of the lower respiratory system, says Everyday Health. A physician must evaluate the material to determine its cause and whether an... More »

www.reference.com Health Pain & Symptoms

A doctor should be seen when phlegm is yellow, green or bloody, according to WebMD. A doctor should also be seen when the cough does not go away. More »

www.reference.com Health Pain & Symptoms

Phlegm is a substance similar to mucus that occurs in the lower respiratory system leading to the lungs, states Everyday Health. Unlike mucus, phlegm doesn't typically appear in the throat and sinuses unless a person cou... More »

www.reference.com Health Pain & Symptoms

Phlegm is a substance similar to mucus that occurs in the lower respiratory system leading to the lungs, states Everyday Health. Unlike mucus, phlegm doesn't typically appear in the throat and sinuses unless a person cou... More »

www.reference.com Health Pain & Symptoms

Phlegm often occurs due to an infection of the lungs or sinuses, such as strep throat, the flu, sinusitis or the common cold, according to Healthgrades. Allergies, inflammation, tonsillitis, reactions to some medications... More »

Coughing up clear phlegm is commonly a sign of infection in the respiratory passageways, such as acute bronchitis, which tends to come on after a bad cold or flu, according to Phaa.com. The coughing up of clear phlegm ma... More »

www.reference.com Health Pain & Symptoms

The presence of excess phlegm or mucus in the throat is caused by allergic postnasal drip, colds and flus, sinus infections, and excess dryness in the air, according to WebMD. Fumes from cleaning products, environmental ... More »