Reflux: Bubbly, clear phlegm at your age, w/o other signs or symptoms, suggests (to me) reflux of saliva from the esophagus or stomach. Average human makes about 1 liter (bit less than 1/2 gallon) of saliva (spit) per day. Most of that is swallowed & recirculated after absorption. For people with problems with reflux (or, rarely, something obstructing esophagus or shrinking size of stomach), it comes back
Answered 1/16/2017
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A doctor has provided 1 answer
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