Acid reflux, Mucinex, breathing air, and posture.
The entire vocal apparatus protects itself from acid reflux by using phelgm. So, if acid reflux, first, make it difficult for the liquid acid reflux to creep upwards. Sleep inclined and avoid bending over. Then neutralize the liquid acid by using antiacids before singing.
Mucinex thins phelgm, but if you have acid reflux, recall that the phelgm is trying to protect your vocal apparatus.
Acid reflux is in two forms– mostly liquid and some gas. If you’re exhaling slighly acidic fumes into your nasal pharynx, it will naturally produce phelgm to protec itself.
Your singing technique or even eating and drinking technique may be causing you to “swallow” too much air. If so, too much acidic gas will be going up through your vocal tract, and cause phelgm.
All these problems usually have a posture cause. Exhaling air from the stomach is aggrevated by the degradation of the slight valve control of the esophageal tract bend–which is a posture problem.
Acid reflux is caused by weakening of the esophageal valve,which many attribute to posture problems.
Hence, though this is difficult, fix your posture as well.
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