Caffeine does not cause post-nasal drip in most people, but the beverages that commonly contain caffeine may cause post-nasal drip. If you notice that every time you consume caffeine you develop symptoms aside from post-nasal drip, you need to talk with a doctor. Post-nasal drip is commonly the result of nasal inflammation that may be a sign of an allergic reaction. Post-nasal drip is common if you have sinus problems, such as a deviated septum, chronic sinus allergies or nasal polyps.
Post-Nasal Drip
Post-nasal drip is the constant dripping and draining of mucus down the back of your throat. Although mucus drains down your throat on a daily basis, about one to two quarts, post-nasal drip occurs only when the mucus is felt, according to the American Academy of Otolaryngology. Most of the time, post-nasal drip is accompanied by nasal congestion that traps excess mucus and forces it to drain down your throat. Excessive post-nasal drip can cause chronic coughing, throat pain and inflammation in the throat. You may develop the feeling of a lump in your throat from the constant irritation of the mucus.
Allergic Reaction
If you develop post-nasal drip anytime you consume any product that contains caffeine, you may have an allergy to caffeine. An allergic reaction is a "mistake" caused by your immune system. Your immune system doesn't recognize the caffeine as a safe substance and accidentally releases antibodies and other chemicals that defend the body. One of the chemicals that primarily will cause post-nasal drip is histamine. Histamine is a chemical produced by your mast cells in your sinus cavity tissue that causes inflammation and increased mucus secretions.
Warmth Consideration
If you have nasal congestion and you drink a hot beverage, such as hot chocolate, coffee or tea, which contains caffeine, the warmth from the beverage may be causing the post-nasal drip and not the caffeine specifically. Warmth from beverages can thin out the mucus that's trapped in your sinus cavity. As the mucus thins, it begins to drain at a faster rate, which causes constant dripping in the back of your throat.
Treatment
If you notice that caffeine triggers post-nasal drip, stop consuming caffeine until you can be seen by your doctor. Post-nasal drip may be treated with over-the-counter antihistamines and decongestants. Talk with your doctor before taking any medication to treat a medical condition.
