When Your Upper Belly Feels Stuffed and You Often Get Indigestion but the Endoscopy Is Clean

You eat only a little and your upper belly feels packed full, you often get indigestion, and burps come up.

People like this are told, even after a gastroscopy, that it's "clean" or "just a bit of gastritis." Take medicine and it eases for a moment, then comes back. Then, along with the word "nervous in origin," they end up taking digestive aids for a long time.

In cases like this, I don't only look at whether the stomach lining is eroded. I first look at the movement by which the stomach receives food and pushes it down, and the nerve that directs that movement.

Why it's bloated even though it's clean

The stomach is not a simple sack. When food comes in, the upper part of the stomach gently stretches to make room (adaptive relaxation), and the lower part squeezes rhythmically to send it down. These two must mesh well for comfortable digestion. But even without any wound on the lining, when this movement and sensation get out of step, even a little food gives a packed-full feeling and doesn't go down well. This is exactly why tests don't catch it.

What directs this movement is the autonomic nervous system, and in particular the vagus nerve. When tension and stress throw off this nerve's rhythm, the stomach can't stretch in time, and sensation, conversely, becomes over-sensitive. So even at an amount that would be nothing to others, you feel the discomfort strongly. Shallow breathing, so that the diaphragm doesn't set the stomach free to move, adds to the sense of pressure in the upper belly.

The state in which bloating, early satiety, and upper-belly pain continue even though the gastroscopy is normal is called functional dyspepsia, and it's well organized that gastric motility and visceral hypersensitivity are involved.

I don't see this kind of indigestion as the single matter of "a weak stomach." I see it as a chain: the rhythm of the nerve that moves the stomach tilts toward tension, and on top of that, sensation grows over-sensitive. Medicine that suppresses stomach acid does its work where acid is the problem. If the problem is on the movement side, the place to work on is different.

I look at what keeps the stomach moving

I look first not at the stomach itself but at the conditions that get the stomach moving.

I check whether you swallow hurriedly when you eat, whether you're always tense, whether your breathing is shallow, whether you lie down right after eating or just sit. When these conditions are laid to rest one by one, the stomach finds its rhythm again. Helping the stomach's movement and soothing the over-sensitive sensation even in the hours after you've left the consulting room — this is the role herbal medicine plays. It's not about doing the digesting for you, but about pushing from the side so the stomach recovers its own rhythm.

When you should go to the hospital first

That said, bloating has signals you must confirm and not skip past. If unintended weight loss, a caught feeling when swallowing, black stools, repeated vomiting, or anemia are present together, don't dismiss it as functional — you should get a gastroscopy and tests first. This is even more the case if you are older or if the indigestion started suddenly. Gallbladder and pancreas problems can also show up as upper-belly discomfort.

I do not claim that all indigestion is explained by gastric movement and nerves alone. If signals like the above are present, I recommend an internal-medicine workup first.

A clean stomach and a stomach out of rhythm

"The endoscopy is clean" means the stomach wall is not eroded. It does not mean the stomach is moving to its own beat. These are two different stories, and one sheet of test results does not hold both. A stomach that is not eroded can still lose its beat, and bloating is usually on that side.

Written by Dr. Heo Ji-young (PhD in Korean Medicine Pathology, Kyung Hee University · former Research Professor of Herbology, Kyung Hee University)