When the mucus runs down the back of the nose to the throat, it’s called the post-nasal drip. Every day, glands in the linings of the nose, throat and airways produce mucus. Mucus is a thick, wet substance that moistens these areas and helps trap and destroy foreign invaders like bacteria and viruses before they cause infection.
Normally, the mucus from the nose goes unnoticed because it mixes with saliva, drips harmlessly down the back of the throat, and it is swallowed. When the body produces more mucus than usual or it’s thicker than normal, it becomes more noticeable.
Thick mucus is stickier and more likely to cause symptoms.
Keeping it thin helps prevent blockages in the ears and sinuses. A simple way to thin it out is to drink more water.