A Physician’s Guide to Gas, Gastritis, and Gastric Problems

“Doctor, I think I have severe gastritis,” the young man said.

He moved uncomfortably in the chair in front of me. He had come straight from his office, and he had the expression I have come to recognise after nearly three decades of practice… a mix of embarrassment and fear.

“Tell me more,” I said, turning towards him. “Is it a sharp, burning pain? Are you feeling nauseous?”

He leaned towards me. Lowered his voice to a whisper. “Worse, Doctor. I am passing gas all day at the office. It is very embarrassing.”

I gave him a reassuring smile. “I understand how awkward that must be,” I told him, “but the excellent news is, you almost certainly do not have gastritis.”

His relief was visible. But also his confusion.

If it was not gastritis, then what was it? And why was so sure it was?

Every week, many patients walk into my OPD with this same look. A young software engineer who Googled his symptoms at 2 AM and is now convinced he has an ulcer. A grandmother who ate a little too much jackfruit at a family gathering and has been belching since evening. A middle-aged businessman, like my friend above, who mistakes flatulence for a diseased stomach because the words sound the same to him. They are never wrong to be concerned. But they are almost always confused about what exactly is going on.

And the confusion is not their fault. It lives in the language itself.

In our clinics and kitchens and thousands of WhatsApp groups, the words “gas,” “gastritis,” “gastric,” and “acidity” are used almost interchangeably, as though they were synonyms.

They are not.

In clinical reality, they describe quite different problems, with different causes and very different remedies.

When the words are confusing, the solutions usually are confusing too.

Let me try to untangle them, one at a time.

Gas

Gas is not a sign of illness. Let me say that clearly.

The healthy human intestine produces between 500 and 1,500 ml of gas every single day. That is half to one-and-a-half litres. Most of it is silently absorbed through the intestinal wall, and what remains is naturally expelled.

Your gut is a small chemical factory, and some exhaust is part of its normal work.

Excessive gas, however, can be quite uncomfortable, causing bloating, distension, and belching. When patients complain of this, the causes usually fall into two broad categories.

The first is aerophagia, the medical term for swallowing too much air. It sounds almost too simple to be real, but it is extremely common. Rapid eating, talking while chewing, drinking carbonated beverages, chewing gum: all of these introduce air into the stomach and intestines. Anxiety plays a very important role. When we are anxious, we swallow saliva more frequently. With each swallow, tiny air bubbles also enter the stomach, and the cumulative effect after a tension-filled afternoon can be a very uncomfortable bloating sensation. Most of this swallowed air eventually comes up as belching.

The second category is dietary. Trillions of harmless bacteria live in our large intestine, where they ferment the food that our small intestine could not fully digest. This is entirely normal. It is, in fact, essential. But certain foods feed these bacteria more generously than others. Complex carbohydrates found in dal, beans, rajma, onions, cabbage, and cauliflower are classic culprits. Starchy foods and tubers, potato and sweet potato chief among them, also contribute. Very high-fibre diets, in spite of having numerous benefits, can increase gas production. And some gastrointestinal conditions, lactose intolerance being the most familiar, can cause the large intestinal bacteria to ferment with particular vigour, producing volumes of gas that the bowel simply cannot absorb fast enough.

So when my patient told me he was “passing gas all day,” what he was really telling me was that his gut bacteria were doing their job, probably a little too energetically.

Not gastritis. Not disease. Biology.

Gastritis

Gastritis, by contrast, is not just a feeling. It is an actual, microscopic inflammation of the inner lining of the stomach. The inside of the normal stomach appears almost like that of the side walls of our mouth. Gastritis is when there is an irritation of that wall. The symptoms can include a pricking or burning abdominal pain, nausea, vomiting, and a persistent sense of dyspepsia. Dyspepsia is that heavy discomfort in the upper abdomen that reduces your appetite and takes away your peace of mind.

There are many common causes.

The most important, globally, is a bacterium called Helicobacter pylori. It infects more than half the population of the world. Think about that for a moment. More than half of every human being alive has this organism in their stomach. In many, it causes no symptoms at all. In some people, it triggers chronic gastritis, and in a few, it can progress to peptic ulcers or even stomach cancer over decades. This is one reason why gastritis, when suspected, deserves a proper diagnosis and not just a packet of antacids from the medical shop.

Medications and toxins form the second major group. Prolonged use of painkillers, specifically the types known as NSAIDs (diclofenac, ibuprofen, and aspirin are the most commonly used), can damage the protective layer of the stomach. Steroids, taken over long periods, can do the same. And alcohol, consumed heavily, is a well-known gastric irritant.

Then there is stress.

Let me tell you about the two types of stress. Severe physiological stress, the type that is seen during critical illness, major surgery, or a prolonged stay in an intensive care unit, can cause acute gastritis. It is a recognised medical entity. But the everyday psychological stress of deadlines, traffic, and difficult relatives does not cause significant stomach disease or H. pylori infections. But the everyday stress alters the movement patterns of the intestine, lower your pain threshold, and increase your awareness of symptoms that you might have ignored otherwise. Here, the stomach is not inflamed… the nervous system is on high alert. The difference matters, because the treatment for each of these is quite different.

Gastric Problem

The word “gastric” simply means “relating to the stomach.” It is a perfectly good adjective in English.

But somewhere along the way, in the day-to-day language of our clinics and homes, it became a diagnosis. “I have a gastric problem” is perhaps the most common self-diagnosis I hear, and it can mean almost anything.

When I ask patients on what they actually feel, the answers usually point to one of three conditions.

The first is dyspepsia, or indigestion. This is a discomfort, heaviness, or fullness in the upper abdomen, sometimes accompanied by nausea, and it is usually triggered by one or more of these: overeating, fatty or spicy meals, and alcohol. It is unpleasant, but it is rarely dangerous.

The second is gastro-oesophageal reflux disease, known by its abbreviation GORD (or GERD, if you prefer the American spelling). This is what most people mean when they say “acidity.” It occurs when stomach acid travels upward into the oesophagus, the tube connecting the throat to the stomach, producing a burning sensation in the centre of the chest. Heartburn, in the literal sense. The lower oesophageal sphincter, a ring of muscle that normally keeps the acid inside the stomach, is either weak or relaxes at the wrong moment. Lying down after a heavy meal makes it worse.

The third is peptic ulcer disease. These are erosions, somewhat like abrasions, in the lining of the stomach or the duodenum (the first part of the small intestine). They cause a sharp, burning pain that can be severe enough to wake you from sleep. H. pylori infection and NSAID use are the two common causes.

What Can We Do?

Here is the good part.

For most people, gas and mild dyspepsia respond beautifully to dietary common sense and behavioural changes. This is because the underlying problem, in most of the otherwise healthy individuals, is due to their habits and not due to a disease.

Eat small, frequent meals rather than large, heavy ones, if you have any of these symptoms. This is advice as old as Charaka, and it remains as sound today as it was two thousand years ago. Eat slowly. Chew well. These simple actions reduce the amount of air you swallow and give your stomach time to tell you that it is full, before you have overfilled it. Avoid habits that increase air swallowing… talking while chewing, using straws, chewing gum for hours at a stretch.

If you are prone to gas and bloating, be thoughtful about the use of starchy foods, tubers, and very high-fibre items. This does not mean you must abandon your grandmother’s sambar or your mother’s bisi bele bath. It means you pay attention. You notice which foods, in which quantities, start your symptoms, and you adjust accordingly. Cooking methods matter too. For example, well-cooked dal is generally well tolerated than undercooked dal.

If dyspepsia or reflux is your main trouble, avoid known triggers… very spicy or fatty foods, acidic foods eaten on an empty stomach, and large meals late at night. Drink plenty of fluids but avoid carbonated drinks like soda. Do not lie down immediately after eating. Elevating the head of your bed by a few inches can make a huge difference for those who suffer from nighttime reflux.

Beyond the kitchen, reduce stress through whatever works for you… yoga, meditation, a walk after dinner, an evening of music. Avoid smoking. Avoid or limit alcohol. This advice is not different from what you already know, I know. But don’t mistake their simplicity for ineffectiveness. They work.

When to Seek Medical Help

It is entirely natural to feel anxious when your stomach is causing you distress. The abdomen is a sensitive area for most people, and the mind, left to its own, imagines the worst. Let me give you some perspective.

Most “gastric” symptoms in otherwise healthy individuals are benign. They are uncomfortable, sometimes embarrassing, occasionally distressing, but not dangerous.

However, there are certain warning signs, what we in medicine call “alarm features,” that should never be ignored. If any of the following accompany your symptoms, please see a doctor promptly.

Always consult a doctor for a proper diagnosis if you are unsure. The cost of a consultation is always less than the cost of prolonged worry.

Ultimately, good gut health is not complicated. We need the same discipline that most good things in life require: moderation, attention, and a little self-awareness. It requires paying as much attention to how we eat as to what we eat.

And if, like my patient, you find yourself passing gas at the office, or anywhere esle, don’t worry. Your gut is almost certainly doing exactly what it was supposed to do. Maybe a little too loudly. But faithfully.

Summary

Shashikiran Umakanth

Dr. Shashikiran Umakanth (MBBS, MD, FRCP Edin.) is the Professor & Head of Internal Medicine at Dr. TMA Pai Hospital, Udupi, under the Manipal Academy of Higher Education (MAHE). While he has contributed to nearly 100 scientific publications in the academic world, he writes on MEDiscuss out of a passion to simplify complex medical science for public awareness.