Stainless Steel and the passive layer Steel is an alloy of iron and carbon. Contrary to carbon steel, the presence of a minimum of 10.5 % chromium in the stainless steel gives it the property of corrosion resistance. Indeed, on contact with oxygen, a chromium oxide layer is formed on the surface of the material.
Sinus Drainage & Stomach Problems. One of the primary results of sinus congestion is drainage. Sinus drainage is expelled in two basic ways: through the nose and the back of the throat. When sinus drainage is expelled in back of the throat, it is referred to as postnasal drip and can cause stomach discomfort.
Sometimes the mucous gathers in the back of the throat overnight, and this can be made worse by sleeping with your mouth open and breathing through your mouth instead of your nose. I wonder whether you ever have any trouble with a blocked nose, or snore or tend to breathe through your mouth a lot. This would certainly make the problem worse. It is also easy to get into the habit of clearing your throat constantly because you have become more aware than usual of the presence of mucous. This can become a habit. It might be worth trying to make an effort to avoid constantly clearing your throat for a little while to see if that makes any difference.