Sorry to hear of this. Dealing with a constantly runny nose can be very annoying!
The medical term for a runny nose is rhinitis. The runnyness is caused by inflammation of the nasal tissue. The most common type of rhinitis is allergic rhinitis. However, it's possible to have the non-allergic variety, too. Another flavor of rhinitis is called gustatory rhinitis, and this refers to getting a runny nose when you eat. Other things can cause a runny nose, such as exposure to cold weather.
If you've never been diagnosed with nasal allergies, this would be a good time to see your health care provider to determine if your runny nose is caused by allergies or not. If it is, an over-the-counter or prescription medication may help dry up your nasal tissue. If your runny nose is not caused by allergies, then your only option may be to invest in a lot of tissue. Not the best news, I know.
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