Weather: Winter and dry air can contribute to post-nasal drip because nasal passages do not react well to heated air. Gastroesophageal reflux disease (GERD): This chronic condition can prevent proper mucus absorption, thereby causing excessive thickened mucus in the back of the throat.Īllergies: Seasonal and food allergies, especially dairy products, can cause thickened secretions.Įnvironmental irritants: Fumes from chemicals, perfumes, cleaning products, tobacco, or other irritants can aggravate the sinuses and lead to post-nasal drip. A nagging cough expels more mucus into the upper throat and mouth, thereby causing post-nasal drip. Thick mucus is evident when a bacterial sinus infection develops. Post-Nasal Drip CausesĬommon cold, flu or sinusitis: Congested sinuses swell in response to viruses or bacterial infections that invade healthy tissues, producing an inflammatory response. It may also drip into the stomach, causing intermittent nausea.
The basic problem is excessive mucus gathers in the throat and nose and it then flows into a person's airway, collecting in the lungs. This can occur for several reasons, explained below. Normally, mucus is swallowed without being noticed, however, it becomes a problem when it evolves into post-nasal drip.
It also acts as a humidifier, captures foreign matter, and combats infections. Mucus is responsible for moistening and cleaning nasal tissue. Glands in the nose and throat produce up to two quarts of mucus each day. Mucus plays a vital role in maintaining good health.
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