This is a common question and one that is often misunderstood. A healthy person's sinuses are constantly draining. This is actually a function of a healthy sinus. When patients become concerned about their sinuses often is when the sinuses are not draining effectively either due to the sinus being blocked (leaving the sinuses to start filling up with mucus) or when the sinus are draining but can't drain properly due to an obstruction elsewhere in the nasal cavity. When medical management fails in getting the sinuses to "stop" draining, an exam by an ENT can often pinpoint the root of the problem.