Clear, bubbly phlegm does not typically indicate a problem. However, coughing up large amounts could indicate an underlying health issue, such as fluid in the lungs. Phlegm, or sputum, is a type of ...

Coughing up phlegm after eating can be a sign that the act of eating is irritating or triggering something in the digestive system. Possible causes include food allergies, aspiration, or GERD. Phlegm ...

Young girl coughs while wrapped in a blanket. Whooping cough can cause severe bouts of coughing. But babies, who are most vulnerable to the disease, may not cough at all. Cases of whooping cough are ...