Post nasal drip can end up leaving you with extra mucus in the back of your throat. This may make you uncomfortable and cause you to try to spit it out.
Post nasal drip causes the extra mucus that has built up to exit down the throat instead of out the nose. The constant running of mucus down the throat begins to irritate the throat, which is not use to having it there. It is almost like the mucus is an invader. The sore throat may be minor or irritating, but shouldn't be as painful as having strep throat.
Post nasal drip is known for causing bad breath. The clinical term for bad breath is halitosis. The mucus that keeps passing through your throat and entering your mouth is what causes the bad odor. The only way to get rid of the bad breath is to get rid of the post nasal drip. Brushing and mouthwashes can mask the odor, but they can't get rid of it.
The mucus tickles the back of your throat and can cause a scratchy feeling. This leads you to cough to try and eliminate the itch.
Mucus travels down the throat and esophagus to the stomach. When too much mucus builds up there, the stomach will want to get rid of it. Its natural reaction is to expel the mucus from the body by causing vomiting. It this continues to occur you will need to contact your doctor for some muscle relaxants.
Post nasal drip can cause a person to experience congestion, which causes difficulty breathing. One may try to blow one's nose to find some relief, but the congestion just returns. There are some vapor machines and vapor creams that may help open up the nasal passages for an hour or two.