Postnasal drip is the most common cause of chronic cough, according to WebMD. Postnasal drip occurs when the body produces more mucus than it needs and the excess mucus drains down the back of the throat. Common causes i... More »

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 » Health Pain & Symptoms

The symptoms of COPD, or chronic obstructive pulmonary disease, include shortness of breath, chest tightness, wheezing, lack of energy, weight loss and frequent respiratory infections, explains the Mayo Clinic. A chronic... More »

Although the most common cause of foamy white mucus in dog vomit is an upset stomach, it can be symptomatic of more serious illnesses like bloat, kennel cough or rabies. In order to determine the severity of the dog's co... More »

Ailments that cause a constant cough with phlegm are tuberculosis, bronchiectasis and lung abscess, according to Mayo Clinic, the National Institutes of Health, and the National Heart, Lung and Blood Institute. A lung ab... More » Health Conditions & Diseases

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 »

Postnasal drip treatment may involve antibiotics, decongestants, antihistamines and drinking plenty of water. Postnasal drip is a condition in which mucus accumulates in the back of the nose and throat, according to Medi... More » Health Conditions & Diseases Cold & Flu