You typically do not notice phlegm until your body starts to produce too much of it due to an infection. Your airway glands create thicker and stickier mucus to help fight off harmful germs.

When it is, you may notice stringy clear, white, or yellow goop in the toilet or clinging to your poop. It may be ...

When a virus moves from your nose down your respiratory tract, your body tries to defend itself by making more mucus. Sometimes it makes too much, and the cilia on the airways can’t push it out, said ...

Post nasal drip is basically just mucus. So with spring allergies you tend to notice-- basically, it's your body's reaction to something foreign. So when you produce a little too much mucus then ...