That is a good question. You have mucus coat on the inner side of the stomach. This protects the stomach from the attack of the acid and pepsin. There is no such protection available to the esophagus.
Stomach acid has a pH between 1.5 and 3.5. It can be strong enough to "burn a hole in a rug". The tissues of the esophagus are not suited to that much acid and will be damaged. We often call this "heart burn" See link below:
stomach- small intestine- large instestine
The valve between the esophagus and the stomach is called the lower esophageal sphincter.
stomach
the stomach
Heartburn occurs within the esophagus and stomach. Stomach acid travels up the esophagus causing a burning feeling in the throat and chest.
Heart burn makes the esophagus or stomach hurt -- not the heart. It is caused by excess stomach acid or burping up stomach acid.
Stomach acid has a pH between 1.5 and 3.5. It can be strong enough to "burn a hole in a rug". The tissues of the esophagus are not suited to that much acid and will be damaged. We often call this "heart burn" See link below:
Basic.
Heartburn is reflux (backflow) of the stomach contents into the esophagus, causing burning and discomfort.
Heartburn process starts from your stomach "back up" into the esophagus It's called the lower esophageal sphincter and it's located between your stomach and your esophagus.
in your intenstines from acid Heartburn takes place in the esophagus. It occurs when stomach acid travels into the esophagus. The mucus lining in the stomach protects it from the acid, but the esophagus has no such protection. Because of this, you feel a burning sensation from acid going up it.
Heartburn occurs when digestive juices from the stomach move back up into the esophagus, the tube connecting the throat to the stomach.A bit more:As to what heartburn actually does, it can cause irritation, and even corrosion of the stomach and esophagus. If you have frequent heartburn, or if it's severe, you need to see your doctor.
heartburn
Heartburn involves the stomach and usually the esophagus. When acid refluxes into the lower esophagus it creates a nasty burning sensation since the esophagus does not have the same protective coating as the inside of a healthy stomach. The pain can be reminiscent of the pain of a heart attack - leading some people to mistake a heart attack for bad heartburn and others to mistake bad heartburn for a heart attack.
simply gravity. if you lay down after eating, stomach acid has no where to go. the easiest place for it to go is back up your esophagus. where as if your standing or sitting up after eating gravity will take over and stomach acid will stay down. so technically its not heart burn at all. its esophagus burn
The esophagus, which is the tube that carries food and drink down your throat and into your stomach. When heartburn occurs, it is usually because there is acid activity at the base of the esophagus, which causes the burning feeling. It can also be because of a gas buildup or bubble, or even by previous irritations in the esophagus. Mostly though it is due to stomach acid bubbling up into the esophagus and causing irritation, which can become inflamed and irritated and prolong the burning. In severe cases this acid irritation has been known to turn into ulcers, and even cancer. At the first sign of heart burn take an antacid or drink something to coat your esophagus, as it takes the hardest beating.