Phlegm originates from the lungs. It is different from the mucus that is produced in the nasal passages. A common cause of phlegm is post nasal drip which is a symptom of sinus infections, colds, flu and inhalation of irritants. The diagnosis of the underlying condition could be made from the color of the phlegm.
A flow chart is a type of diagram representing a process using different symbols containing information about steps or a sequence of events. Each of these symbols is linked with arrows to illustrate the flow direction of the process.
Standard Flowchart Symbols and Meaning. Flowcharts use special shapes to represent different types of actions or steps in a process. Lines and arrows show the sequence of these steps, and the relationships between them. Pic.1. Standard Flowchart Symbols. See also alternative flowchart symbols: Workflow Flowchart Symbols