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

Coughing up white phlegm may indicate bronchitis that is viral in nature, explains Cedars-Sinai. It can also be a sign of mycoplasmatic pneumonia, which shares characteristics of both viral and bacterial types of pneumon... More »

Coughing up yellow phlegm can indicate that the body is fighting off a disease and has produced mucous as a response, according to WebMD. Yellow phlegm can indicate the presence of a bacterial infection or another condit... More »

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Prolonged coughing, bronchitis or other chest infections, and bronchiectasis can cause blood in phlegm, according to WebMD. Additional causes include tuberculosis, lung cancer and other cancers of the respiratory system. More »

www.reference.com Health Pain & Symptoms

Common causes of constant coughing and excess phlegm include postnasal drip, asthma and gastroesophageal reflux disease, according to Mayo Clinic. More serious causes include viral and bacterial infections, chronic bronc... More »

Controlled coughing from the lungs, lying down to drain the mucus from the lungs and lightly tapping the chest and back can all help to clear phlegm from the lungs, according to WebMD. Breathing steam and running a humid... More »

Contact a doctor immediately if someone shows signs of aspiration, such as rapid or very slow breathing, severe coughing after eating or drinking, a hoarse voice, fever, and a chronic cough that produces phlegm with bits... More »